WO2024256329A1 - Production de de dents prothétiques optimisée en termes de consommation de matériau - Google Patents

Production de de dents prothétiques optimisée en termes de consommation de matériau Download PDF

Info

Publication number
WO2024256329A1
WO2024256329A1 PCT/EP2024/065940 EP2024065940W WO2024256329A1 WO 2024256329 A1 WO2024256329 A1 WO 2024256329A1 EP 2024065940 W EP2024065940 W EP 2024065940W WO 2024256329 A1 WO2024256329 A1 WO 2024256329A1
Authority
WO
WIPO (PCT)
Prior art keywords
insert element
milling body
recess
prosthetic
dental prosthesis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2024/065940
Other languages
German (de)
English (en)
Inventor
Frank-Uwe Stange
Matthias MÖLLER
Karl-Heinz Renz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kulzer GmbH
Original Assignee
Kulzer GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kulzer GmbH filed Critical Kulzer GmbH
Priority to EP24732607.7A priority Critical patent/EP4727486A1/fr
Publication of WO2024256329A1 publication Critical patent/WO2024256329A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0004—Computer-assisted sizing or machining of dental prostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0006—Production methods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0022—Blanks or green, unfinished dental restoration parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/01—Palates or other bases or supports for the artificial teeth; Making same
    • A61C13/04—Palates or other bases or supports for the artificial teeth; Making same made by casting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/08—Artificial teeth; Making same
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/10—Fastening of artificial teeth to denture palates or the like
    • A61C13/1003—Fastening of artificial teeth to denture palates or the like by embedding in base material

Definitions

  • the invention relates to a method for producing a dental prosthesis, wherein the dental prosthesis has at least one prosthetic tooth and a prosthetic base, wherein the prosthetic base has a gum-colored plastic and wherein the at least one prosthetic tooth and the prosthetic base are firmly connected to one another in the method and wherein the at least one prosthetic tooth is manufactured using a method for producing at least one prosthetic tooth using a subtractive CAM method in accordance with at least one virtual three-dimensional model of the at least one prosthetic tooth.
  • the present invention further relates to a modular milling body system for producing a dental prosthesis with at least one prosthetic tooth and a device for implementing an aforementioned method.
  • Dental prostheses also known as dental prosthetic dentures, comprise a denture base and one or more denture teeth and are used to supplement the remaining teeth.
  • a support structure may also be present as a support or holding structure or may be required as a load-bearing component of the functional elements.
  • metal model castings are used, to which denture plastic and denture teeth are attached using an analogous process.
  • Dental prostheses such as dental prostheses (partial and full dentures), denture teeth, crowns, bridges and bite splints, have been manufactured subtractively in milling processes using CAD/CAM technologies for several years (CAM - Computer-Aided Manufacturing, CAD - Computer-Aided Design). CAD/CAM processes are also increasingly being used in the manufacture and design of denture teeth and dental partial and full dentures with a denture base to rest on the gingiva and denture teeth attached or arranged in it.
  • Digital processes allow the production of denture teeth, denture bases, support structures and other dental molded bodies using subtractive manufacturing processes, e.g. milling processes, or additive manufacturing processes, e.g. sintering processes. Tooth-colored denture teeth or gum-colored elements can also be digitally prefabricated.
  • REPLACEMENT BLADE Preformed blanks are usually used as milling bodies for the production of denture teeth. These can be discs or smaller parts such as milling blocks. What all of these blanks have in common is that they consist of a material base with the same properties throughout the entire body, for example the same color and material composition.
  • milling blocks with a holder attached on one side are used for smaller prosthetic work such as individual crowns and round blanks, whereby the round blanks are fixed in holding systems and machined on both sides using a multi-axis milling process.
  • the construction is broken down into a "white” or tooth-colored tooth portion (the prosthetic tooth or teeth) and a gum-colored ("pink") prosthetic base portion (the prosthetic base).
  • Dental prostheses therefore consist of a gum-colored or pink prosthetic base and tooth-colored portions (prosthetic tooth or teeth).
  • Patent DE 103 04 757 B4 discloses a method for producing dental prostheses in which the prosthetic teeth are virtually set up in a virtual model and a prosthetic base is produced on the basis of the virtual model.
  • EP 2 742 906 A1 discloses a method in which a dental arch is connected to an impression material, the impression material being contained in an individualized impression tray and containing an impression of the patient's oral cavity. The surface of the mold with the dental arch is digitized and then a virtual model of the dental arch is positioned and oriented as closely as possible in the virtual model of the prosthetic base.
  • denture teeth are required that can be clearly and reproducibly bonded to the denture base.
  • WO 2016/091 762 A1 discloses a method for producing a dental prosthesis, in which a template is produced with which several prosthetic teeth can be attached to a prosthetic base in the desired position and orientation to one another. The prosthetic teeth are shortened by basal grinding in a cervical area in order to produce the desired bite height.
  • WO 2016/110 392 A1 discloses a method for producing a dental prosthesis, in which a plastically deformable connecting means is introduced into tooth sockets of a prosthetic base in order to facilitate manual
  • DE 10 2008 019 694 B3 discloses a method and a device for producing dental molded bodies made of ceramic using a laser.
  • EP 2 571 451 B1 and EP 2 666 438 A2 disclose methods for producing dental dentures in which prefabricated denture teeth are embedded in wax in a holder and then milled cervically using a CAM process. It is necessary to shorten the denture teeth basally (or cervically) in order to adapt the tooth height to the patient's jaw, i.e. to adjust the bite height of the dental denture to suit the patient's needs.
  • WO 2014/159 436 A1 discloses a layered dental denture with a reinforcement in the denture base, which is cast into a basal cavity.
  • connection of the denture base and denture teeth represents a considerable challenge.
  • a critical aspect is therefore still the connection of the digitally manufactured parts to one another, particularly with regard to the precision of the arrangement in relation to one another. Bonding, even when using positioning aids such as fixing keys, always leads to a more or less severe misfit that must be manually corrected by the practitioner.
  • the connection is usually made by bonding, whereby the quality of the transitions can be affected by the use of too little or too much adhesive, as well as the correct positioning of the denture teeth during bonding.
  • One-piece two-tone (gum-colored and tooth-colored) milling blanks which are also available, have a very good connection between the layers, but the aesthetics are always a compromise due to the specified phase boundaries and are therefore unsatisfactory.
  • US 2009/0023112 A1 discloses providing a plurality of sub-blanks in a holder in order to reduce the amount of milling waste when producing crowns, abutments and bridges.
  • KR 1020160003528 A discloses a template with several recesses in which tooth molds can be attached.
  • DE 20 2015 004 759 A1 proposes filling a recess in a milling blank with a fluid material, which is then hardened and then used to produce dental prostheses.
  • US 2013/0101962 A1 discloses a method for producing a dental prosthesis, wherein several recesses are milled into a block along a dental arch, wherein several plastics are filled into the recesses and in between the plastics hardened in the recesses are used to make the prosthetic teeth. The block is then largely removed and the prosthetic base is made from the block. The method is a multi-stage milling process.
  • the disadvantage of the method according to US 2013/0101962 A1 is the large
  • EP 2 915 503 B1 discloses a reverse method for producing a dental prosthesis in which a milling blank made of enamel material is subtractively machined to create a cavity which is used as a negative mold for a prosthesis base of a dental prosthesis. The occlusal side and the basal side of the dental prosthesis are then subtractively manufactured from the composite thus created. This is also a multi-stage milling process.
  • a disadvantage of a method according to EP 2 915 503 B1 can be that very large amounts of the relatively hard enamel material and the other materials have to be removed in order to produce the dental prostheses. This could then not only result in the loss of a large amount of enamel material and the other materials, but the milling tools could also be subjected to intensive strain and the time required to implement the method would be relatively long.
  • one disadvantage of conventional methods can be that either the denture teeth or the denture base have to be made from castable plastics such as PMMA-based materials. This limits the choice of materials.
  • REPLACEMENT BLADE (RULE 26)
  • the disadvantage here can be the position of the transitions from gum color to tooth color, which always represents a compromise and is aesthetically unsatisfactory.
  • One object of the invention is to at least partially overcome at least one disadvantage or several disadvantages of the prior art.
  • possibilities are to be found to provide a method for producing at least one prosthetic tooth and a method for producing a dental prosthesis comprising at least one such prosthetic tooth as well as a device for implementing such methods in which a smaller proportion of the material required to produce the prosthetic teeth is consumed.
  • the tools of the CAM device used, in particular the CAM milling machine are to be protected.
  • the methods should be as easy and inexpensive to implement as possible.
  • a device for implementing such a method and a modular milling body system for producing a dental prosthesis are to be found which can at least partially achieve these advantages.
  • the processes should enable rapid and resource-efficient production using subtractive CAM processes and, if necessary, additive CAM processes.
  • the process for producing the dental prosthesis should not only use as little material as possible for the prosthetic teeth, but also require as little of the material for the prosthetic base to be removed. Production can be largely based on digital manufacturing techniques.
  • the materials should be able to be joined together as part of the process.
  • the choice of material should be as free as possible.
  • the process should be as simple and inexpensive as possible for the dental technician to implement. In particular, fully automated or as largely automated as possible techniques such as CAD/CAM technologies should be used and usable wherever possible.
  • REPLACEMENT BLADE (RULE 26)
  • the features of the independent claims 1, 22 and 31 contribute to at least partially fulfilling at least one of the aforementioned objects.
  • the dependent claims 2 to 21 and 23 to 30 provide preferred embodiments that contribute to at least partially fulfilling at least one of the objects.
  • a method according to claim 1, a modular milling body system for producing a dental prosthesis according to claim 22 and a device for implementing such a method according to claim 31 therefore make at least a contribution to at least partially solving the objects.
  • Preferred variants are claimed in the subclaims 2 to 21 and 23 to 30.
  • the objects of the invention are thus at least partially or contributively achieved by a method for producing a dental prosthesis, wherein the dental prosthesis has at least one prosthetic tooth and a prosthetic base, wherein the prosthetic base has a gum-colored plastic and wherein the at least one prosthetic tooth and the prosthetic base are firmly connected to one another in the method, wherein the at least one prosthetic tooth is produced using a subtractive CAM method in accordance with at least one virtual three-dimensional model of the at least one prosthetic tooth, wherein the method has the following chronological steps:
  • REPLACEMENT BLADE (RULE 26) in an embedding material within the at least one recess or by press fitting the at least one insert element in the at least one recess;
  • a dental prosthesis in the sense of the present invention has a prosthesis base (usually made of a gum-colored (“pink”) plastic) and at least one prosthetic tooth (usually made of a tooth-colored plastic or a tooth-colored ceramic).
  • the dental prosthesis can also have a support structure, which consists for example of a metal or a plastic and which serves to attach the dental prosthesis in the patient's mouth.
  • a dental prosthesis can be a partial dental prosthesis or a full dental prosthesis.
  • a fit of the at least one insert element in the at least one recess means that the external shape of the at least one insert element corresponds to the shape of at least one of the at least one recess(es).
  • a uniform gap preferably a maximum of 5 mm, particularly preferably a maximum of 1 mm, very particularly preferably a maximum of 0.1 mm
  • the at least one insert element can be inserted into the matching at least one recess with a press fit.
  • a press fit is understood to mean a fit in which the at least one insert element is in direct contact with two opposing walls or wall parts of the at least one recess and that, due to elastic deformations or an elastic force of the at least one insert element and/or the material of the milling body, pressure is exerted on the at least one insert element, which holds the at least one insert element in the at least one recess and thereby secures it.
  • the pressure can be very low and also only local.
  • the press fit does not have to run along the entire circumference of the at least one insert element.
  • the uniform gap of contact points or contact surfaces can be interrupted by the at least one insert element resting on the outer circumference at the contact points or contact surfaces.
  • REPLACEMENT BLADE (RULE 26) It may be that several insert elements are inserted or inserted into the at least one recess in pairs or groups and adjacent to one another. According to the invention, however, exactly one insert element is preferably inserted or inserted into a recess.
  • Working out the at least one prosthetic tooth from the at least one insert element means that at least 80% of the surface, preferably at least 90% of the surface of the at least one prosthetic tooth is finished after step G) and - apart from polishing or surface finishing - has the desired shape.
  • a bar or bars or other thin connections remain between the at least one prosthetic tooth and the remaining milling body during the CAM process, so that the at least one prosthetic tooth is held over the milling body and remains connected to the CAM device.
  • step G) at least 80% of the surface(s) of the at least one insert element are machined, particularly preferably in step G) at least 90% of the surface(s) of the at least one insert element are machined.
  • the at least one insert element preferably has a geometric shape, but can alternatively have an approximate tooth shape.
  • a separate three-dimensional virtual model can be created using the CAD process in step A).
  • groups of prosthetic teeth are created in step A) as a connected three-dimensional virtual model using the CAD process.
  • the latter has the advantage that connected tooth areas can be manufactured together.
  • the at least one insert element is not an anatomically preformed or prefabricated prosthetic tooth. This makes it clear that the occlusal areas of the at least one prosthetic tooth should also be milled out of the at least one insert element.
  • step G) when machining the at least one prosthetic tooth the entire surface of the at least one insert element exposed in the milling body is machined, in particular the entire surface of the at least one insert element is machined down to a holding geometry.
  • the at least one insert element can preferably be present as a body of any shape. It may therefore be sufficient to have a small number of possible insert elements available for the manufacture of the prosthetic teeth in order to
  • REPLACEMENT BLADE (RULE 26) possible prosthetic teeth from it.
  • the holding geometry can be implemented, for example, by means of webs that connect the prosthetic teeth worked out of the at least one insert element in step G) to the rest of the milling body. At least partial areas of the holding geometry in the areas adjacent to the prosthetic teeth consist of the material of the at least one insert element from which the prosthetic teeth were fixed.
  • the holding geometry is separated in a final step in order to isolate the prosthetic teeth individually or in groups and to separate them from the milling body. The separation can be carried out, for example, by cutting free, breaking the holding geometry and/or milling free.
  • step A) the virtual three-dimensional model of the dental prosthesis is created by CAD construction and adaptation to a virtual three-dimensional model of the oral cavity situation of a patient.
  • step B) the selection of the at least one insert element is additionally carried out depending on the function and/or the position of the prosthetic tooth in the dental prosthesis, wherein the selection of the at least one insert element is preferably carried out with regard to the color, the transparency and the mechanical physical properties of the at least one insert element.
  • molars can have a different color, hardness and elasticity than canines and incisors.
  • the respective teeth can have the physical properties suitable for their purpose and can be adapted to the appearance of a natural set of teeth through their coloring.
  • step B) the selection of at least one insert element is additionally carried out depending on an individually determined colour selection and/or colour selection computer-aided by colour matching.
  • step 02) an electronic storage of the shape of the at least one depression produced in step 02) together with an identifier of the milling body takes place, so that in subsequent methods the milling body with the depression produced in step 02) is available as a selectable milling body in the context of a step 01).
  • the embedding material is a wax or an adhesive or a polymerizable plastic, which is used in liquid form in step E) for fastening the at least one insert element, wherein preferably the wax is removed in step H) by boiling or melting or chemically or the polymerizable plastic or the adhesive is chemically dissolved.
  • the embedding material mentioned on the one hand, a stable fastening of at least one insert element is possible (this applies in particular to the polymerizable plastic and the adhesive), and on the other hand, the embedding material can be removed again without great effort (this applies in particular to the wax). By removing the embedding material, the milling body can then be used again with a method according to the invention.
  • the at least one insert element has a symmetrical geometric shape with at least one mirror symmetry plane and/or at least one rotational symmetry axis, preferably a cuboid shape, a cylindrical shape, a cylindrical shape with a triangular base, a cylindrical shape with a triangular base with rounded edges of the triangular base, a bar shape or a trapezoidal shape.
  • a cylindrical shape is understood to mean the shape of a general cylinder with any base area and not only a cylinder with a circular base area, unless the shape of the base area is specified.
  • these shapes enable the at least one insert element to be easily inserted into the at least one recess.
  • these shapes represent good approximations to a general tooth shape, so that the amount of material to be removed from the at least one insert element remains small.
  • step G) the at least one prosthetic tooth is separated from the milling body and the remains of the at least one insert element and preferably the remains of the at least one insert element are removed from the at least one recess, wherein particularly preferably the embedding material is also removed from the at least one recess.
  • the at least one prosthetic tooth is released from the milling body and can then be used to construct the dental prosthesis, if necessary after final processing (deburring, hardening, surface finishing and/or polishing).
  • the at least one prosthetic tooth can be inserted into a prosthetic base produced using a CAD/CAM process and secured there, particularly preferably by gluing the at least one prosthetic tooth into tooth sockets of the prosthetic base.
  • the at least one insert element is not a prefabricated prosthetic tooth.
  • each prosthetic tooth is assigned its own separate insert element or several groups of adjacent prosthetic teeth are each assigned its own separate insert element, wherein the groups of adjacent prosthetic teeth are preferably grouped into groups of molar prosthetic teeth and of incisor prosthetic teeth and canine prosthetic teeth or of molar prosthetic teeth, of incisor prosthetic teeth and of canine prosthetic teeth.
  • the insert elements can be pre-shaped to match the denture teeth to be made from them and, if necessary, also colored to match.
  • insert elements with suitable mechanical physical properties can be selected.
  • Molar denture teeth are also known as cheek teeth or molars, incisor denture teeth as incisors and canine denture teeth as canines.
  • the objects underlying the present invention are also at least partially achieved by a method for producing a dental prosthesis, wherein the dental prosthesis has at least one prosthetic tooth and a prosthetic base, wherein the prosthetic base has a gum-colored plastic and wherein the at least one prosthetic tooth and the prosthetic base are firmly connected to one another in the method, wherein the at least one prosthetic tooth is manufactured using one of the previously described methods according to the invention.
  • the process for producing the dental prosthesis utilizes the advantages of the process for producing the prosthetic teeth.
  • REPLACEMENT BLADE (RULE 26) It may be provided that the procedure for implementing step G) includes the following steps:
  • step H filling at least one fluid polymerizable plastic into the connecting surface and into the negative mold and into the volume removed in step H) and curing the at least one fluid polymerizable plastic, wherein the curing of the at least one fluid polymerizable plastic produces a cured plastic material which is firmly and flush-bonded to the material of the insert element;
  • a wax or a polymerizable plastic is preferably used as the embedding material according to the invention, if an embedding material is required.
  • a gum-colored plastic is particularly preferably used as the embedding material in step E).
  • the fluid polymerizable plastic used in step I) can preferably also be used as an embedding material beforehand in step E) according to the invention.
  • the milling body can also be used directly to produce the denture base from the fluid polymerizable plastic. It is important that all denture teeth that are made from insert elements that are inserted or plugged into the milling body and then attached during or after the milling process have the position and orientation to each other that are intended in the final denture base. Additional denture teeth can then be inserted separately into the denture base if desired.
  • REPLACEMENT BLADE (RULE 26) inserted and attached to the denture base.
  • all denture teeth of the dental prosthesis are made from the attached insert elements using this method.
  • a support structure can be incorporated into the prosthesis base by attaching it to the milling body before step I) and embedding it in step I) with at least one fluid polymerizable plastic.
  • the milling body may not be reusable in this application. Instead, a complete dental prosthesis can be constructed based on the milling body.
  • the negative mold of at least the partial area of the oral surface of the prosthesis base of the dental prosthesis to be produced which is produced in step H) in the surface of the milling body and in the at least one insert element, and if present in the embedding material, is produced with an offset, wherein the offset increases the volume of the virtual model of the dental prosthesis.
  • An offset for the negative shape of the partial area of the surface of the dental prosthesis is an expansion of the surface of the dental prosthesis, in particular a uniform expansion of the surface of the dental prosthesis, towards a larger volume of the dental prosthesis.
  • the offset can be achieved, for example and preferably according to the invention, by mathematically adding a distance vector to the surfaces of the virtual model of the dental prosthesis that are aligned towards the underside of the milling body and are not intended to consist of the material of the insert elements.
  • the distance vector can be aligned towards the underside of the milling body so that a parallel displacement of the surfaces of the virtual model of the dental prosthesis that are not intended to consist of the first material occurs.
  • the distance vector can also be arranged perpendicular to the surface of the virtual model of the dental prosthesis so that the relevant surfaces of the virtual model are evenly expanded.
  • Other equivalent or similar possibilities for using a distance vector or other calculation methods to generate the offset are easily conceivable and feasible for the person skilled in the art.
  • step I) at least one of the at least one fluid polymerizable plastics wets the entire surface of at least the surfaces produced in step H) in the at least one insert element during filling.
  • the dental prosthesis has a support structure, wherein the support structure is firmly connected to the prosthesis base or to the prosthesis base and the at least one prosthetic tooth, wherein the support structure is provided for fastening the dental prosthesis in the oral cavity of a patient, wherein the at least one prosthetic tooth and the prosthetic base and the support structure are firmly connected to one another in the method.
  • a dental prosthesis with a support structure for fastening the dental prosthesis in the oral cavity in particular a dental partial prosthesis with such a support structure, can be produced using the method according to the invention.
  • the support structure consists of or is made of a material with a greater hardness and/or elasticity than fully cross-linked PMMA and/or the support structure is made of metal, ceramic, stainless steel, titanium or a titanium alloy.
  • a tensile modulus of elasticity according to ISO 527 of approximately 3200 MPa and/or a tensile strength according to ISO 527 of approximately 73 MPa is assumed.
  • a contribution to solving at least one part of the present invention is also made by a modular milling body system for producing a dental prosthesis, wherein the modular milling body system has at least one milling body and a plurality of insert elements, wherein at least one recess is provided on one side of the milling body, wherein the at least one recess has a geometric shape and the at least one recess is formed to receive at least one of the insert elements in a fit, wherein the insert elements individually or placed against one another have the same geometric shape as the at least one recess.
  • a fit of the at least one insert element in the at least one recess is to be understood as meaning that the external shape of the at least one insert element corresponds to the shape of at least one of the at least one recess(es).
  • REPLACEMENT BLADE (RULE 26) It should be provided that there is a uniform gap between the at least one insert element and the peripheral edge of the matching at least one recess or that the at least one insert element can be inserted into the matching at least one recess with a press fit. By means of a fit, a clear assignment of the respective insert element to the respective recess can be achieved and the desired position and orientation of the respective insert element in the respective recess can be determined.
  • a recess that fits one or more of the insert elements is the recess into which the insert element or several insert elements placed next to one another can be inserted or inserted in a fit into this recess.
  • the at least one milling body has a solid body made of a first material, wherein the at least one recess is formed in the first material.
  • the insert elements individually or placed next to one another, have the same geometric shape but are smaller than the matching at least one recess, so that when an insert element or several insert elements placed next to one another are inserted into the matching at least one recess, a uniform gap remains between the at least one insert element inserted into the at least one recess and an inner circumferential side wall of the recess, wherein a gap size of the gap is preferably a maximum of 1 mm, particularly preferably at least 1 pm and a maximum of 1 mm, very particularly preferably at least 10 pm and 100 pm.
  • the insert elements have a symmetrical geometric shape, preferably the insert elements have a symmetrical geometric shape with at least one mirror symmetry plane and/or at least one rotational symmetry axis, particularly preferably a cuboid shape, a cylindrical shape, a cylindrical shape with a triangular base, a cylindrical shape with a triangular base with rounded edges of the triangular base, a bar shape or a trapezoidal shape.
  • a cylindrical shape is understood to mean the shape of a general cylinder with any base and not only a cylinder with a circular base, unless the shape of the base is specified otherwise.
  • REPLACEMENT BLADE (RULE 26) general tooth shape, so that the amount of material to be removed from the respective insert element remains small.
  • the insert elements consist of at least one material for the production of prosthetic teeth, preferably at least two of the insert elements consist of at least two different materials for the production of prosthetic teeth.
  • the denture teeth can be made from the insert elements. If there are several materials for different insert elements, the material can be adapted to the respective denture tooth. For example, incisors can be made with a different and adapted hardness and/or elasticity than molars or canines.
  • the insert elements have different sizes, in particular different heights, shape proportions and/or weights.
  • the insert elements have different colors and/or transparency, in particular have different tooth-colored colors and/or transparency.
  • the insert elements have a greater hardness than the material of the at least one milling body in which the at least one recess is formed.
  • the modular milling body system has at least one embedding material, in particular a wax, a polymerizable plastic and/or an adhesive, or has a cartridge for producing a fluid polymerizable plastic and/or a fluid adhesive as the embedding material with which the insert elements are to be fastened in the at least one recess of the at least one milling body.
  • a cavity for receiving a fluid polymerizable plastic is arranged on an upper side of the at least one milling body, wherein the cavity has a surface as a base, wherein the at least one depression is arranged in the surface, and the cavity is laterally delimited by a circumferential wall starting from the edge of the surface, wherein the circumferential wall is annular, wherein preferably the circumferential wall has a wall thickness of a maximum of 20 mm, particularly preferably of a maximum of 10 mm, very particularly preferably of a maximum of 5 mm, and/or the circumferential wall is at least 5 mm high, particularly preferably at least 15 mm high.
  • An annular wall in the sense of the present invention has a recess that encloses the geometric center of the recess.
  • the recess is formed without undercuts and/or every point in the recess can be connected in a straight line to every other point in the recess without the straight line running within the surrounding wall.
  • the recess is a compact geometric body.
  • a cavity for filling a fluid polymerizable plastic as a material for producing the prosthesis base on an upper side of a milling body for producing the dental prosthesis it is possible to reduce the amount of material of the insert element(s) and the milling body that has to be subtractively milled out or removed by skillfully selecting the position of the occlusal side of the dental prosthesis in the CAD calculation of the associated CAM process. It is then sufficient to place the basal surface of the more abrasion-resistant denture teeth or the occlusal part of the dental prosthesis in the area of the surface of the cavity.
  • the lighter and easier to mill plastic for producing the denture base or the basal part can then simply be filled into the cavity created and only needs to be filled into the cavity up to the desired height, so that here too there is a saving in the plastic material used to produce the denture base. Every saving in material automatically leads to a saving in time and to the protection of the tools used, especially when particularly abrasion-resistant and resilient materials are to be processed.
  • a marking for determining a filling level in the cavity is arranged on at least one inner side and/or outer side of the circumferential wall delimiting the cavity, wherein the marking preferably has a
  • REPLACEMENT BLADE Scaling with equidistant calibration marks and/or numbers, particularly preferably a length scale for determining a filling level or a volume of a fluid polymerizable plastic in the cavity.
  • the circumferential wall of the at least one milling body is formed by a pipe piece or an annular body which is fixed to the solid body.
  • the side of the at least one milling body in which the at least one recess is arranged is flat.
  • the at least one milling body is a round blank with a cylindrical outer circumference.
  • the at least one milling body has a holder on its outer side for fastening the at least one milling body to a suitable counter holder of a CAM device.
  • modular milling body system is suitable and intended for the implementation of a previously described method.
  • the modular milling body system is particularly well suited for implementing the method described above or according to the invention and benefits in particular from the above-mentioned measures and advantages of the methods described there.
  • the objects underlying the present invention are at least partially also achieved by a device for implementing a previously described method, wherein the device has an insert element selection module and a milling body provision module, wherein the insert element selection module is designed such that the at least one insert element can be selected as a function of the at least one virtual three-dimensional model of the at least one prosthetic tooth, wherein the selection is made such that the volume of at least one prosthetic tooth of a dental prosthesis can be completely accommodated in the volume of the at least one insert element,
  • the milling body provision module is designed such that it can be used to select the milling body with at least one recess matching the at least one insert element, so that the at least one selected insert element can be inserted into the at least one recess in a fit, and/or the milling body provision module is designed such that it can be used to calculate a CAD model for at least one recess in a milling body matching the at least one insert element, so that the at least one selected insert element can be inserted into the at least one recess in a fit.
  • the device has the advantages of the method according to the invention and can also utilize the advantages of the further developments of the method according to the invention.
  • the device according to the invention can be a device for producing at least one prosthetic tooth for a dental prosthesis or a device for producing a dental prosthesis with at least one prosthetic tooth, preferably with several prosthetic teeth.
  • the invention relates to a method for producing a prosthetic tooth according to a virtual three-dimensional model, comprising the steps:
  • the invention also relates to a modular milling body system for producing a dental prosthesis and a device for implementing such a method.
  • the invention is based on the surprising discovery that by using insert elements made of a material suitable for denture teeth with a known and suitable geometry that are embedded in a milling body or inserted with a press fit, it is possible to mill denture teeth out of the insert elements and in doing so only use a small amount of the material suitable for the denture teeth.
  • the milling bodies can be used several times by inserting a
  • REPLACEMENT BLADE Recess is used to accommodate new insert elements in subsequent manufacturing processes.
  • a particularly precise fit of the insert elements in the recesses of the milling body is not important for embedding, since the insert elements can have a sufficient excess so that the desired prosthetic tooth, digitally constructed using the CAD process, finds sufficient space in the respective insert element.
  • a particularly precise fit can further reduce the waste of the insert element material suitable for the prosthetic teeth.
  • this requires more precise positioning of the insert elements, which can be achieved, for example, with a press fit of at least one insert element in at least one recess of the milling body.
  • a prosthetic base and, if desired, a support structure can also be connected to the prosthetic teeth manufactured according to the invention during the production of the dental prosthesis directly in accordance with a virtual three-dimensional model of the dental prosthesis (the virtual three-dimensional model with or without a support structure), while at the same time ensuring time-saving and resource-saving production when implementing the manufacturing method.
  • connection surface is calculated based on the virtual three-dimensional models used - and possibly also based on the virtual three-dimensional models produced as part of the process - and is produced in the milling body and the insert elements attached therein.
  • a geometry of the milling body that already roughly corresponds to the final dimensions allows a significantly reduced material consumption.
  • a wider range of materials can also be used, and there is no longer a limitation to PMMA. Due to the reduced subtractive removal, milling times can also be significantly reduced. By only milling the final part in the connected state, the result corresponds to
  • REPLACEMENT BLADE (RULE 26) with high accuracy of the digital database, i.e. the virtual three-dimensional model of the dental prosthesis to be manufactured.
  • the method according to the invention achieves a high level of accuracy of fit of the dental prosthesis by directly milling the final shape. There is no effort involved in gluing individual prosthetic teeth and no inhomogeneities arise in the dental prosthesis due to a joining process.
  • a particularly abrasion-resistant material can be achieved for the at least one prosthetic tooth of the dental prosthesis by completely hardening the insert elements or by using particularly hard and solid insert elements.
  • layered insert elements By using layered insert elements, a particularly aesthetically pleasing prosthetic tooth material can also be obtained.
  • a particularly high level of aesthetics can be achieved by using multilayer insert elements for the at least one prosthetic tooth.
  • the production from the insert elements, the milling body, from the cured or partially cured fluid polymerizable plastic and with the method according to the invention can be carried out in a manufacturing process of only three or four stages.
  • the preformed insert elements can already be shaped to fit, for example, have a standard shape such as a cylinder or bar shape.
  • the required recesses or cavities in the milling body as a carrier material can either be generated in advance in a separate step, or can already be preformed in a standardized way.
  • the materials required for this area e.g. different colors, are individually inserted into the recesses in the form of individual, suitable insert elements.
  • the attachment can be done by polymerizing, alternatively by gluing.
  • the gluing can be done, for example, using an adhesive that can be removed reversibly. This means that, for example, when the material is heated later, the processed material residues can be removed and replaced with new insert elements. This enables the milling body to be reused multiple times.
  • the insert elements embedded in the milling body as a carrier blank are then processed using a suitable milling machine in the CAM.
  • Figure 1 a schematic perspective view of an upper side of a first milling body according to the invention (left) and, to the right, a matching insert element;
  • Figure 2 a schematic perspective view of an upper side of a second milling body according to the invention (left) and to the right of it a matching insert element;
  • Figure 3 a schematic perspective view of the milling body according to Figure 2 with inserted insert element
  • Figure 4 a schematic perspective view of the milling body according to Figure 3 with attached insert element
  • Figure 5 a schematic perspective view of the milling body according to Figure 4, with two prosthetic teeth machined out of the attached insert element;
  • Figure 6 a schematic perspective view of an upper side of a third milling body according to the invention (top) with several recesses and below them several insert elements;
  • Figure 7 a schematic perspective transparent view of a lateral side of a fourth milling body according to the invention with inserted insert element and with a cross-sectional view and a position of the dental prosthesis to be produced therewith;
  • Figure 8 a schematic view of the top of the milling body according to Figure 7 after subtractive machining of the connecting surface and the negative mold for the oral side of the denture base;
  • Figure 9 a schematic view of the basal side of the dental prosthesis after subtractive machining from the previously filled and then cured plastic material;
  • Figure 10 a schematic view of the occlusal or oral side of the dental prosthesis after subtractive machining from the material of the milling body, the material of the insert element and the previously filled polymerized hardened plastic material;
  • Figure 11 the sequence of a method according to the invention for producing a dental prosthesis.
  • Figure 1 shows a schematic perspective view of a top side (top in Figure 1) of a first milling body 1 according to the invention and, to the right of it, a matching insert element 7.
  • the milling body 1 preferably has a solid body 2 made of a material that can be milled easily and precisely.
  • the material of the solid body 2 should not be too hard, but at the same time should not crumble or break brittlely during milling.
  • the solid body 2 extends to a bottom side opposite the top side of the milling body 1 (not visible in Figure 1).
  • the material for the insert element 7 can be a fully polymerized tooth-colored plastic that is suitable for the production of prosthetic teeth and has the necessary abrasion resistance for this purpose.
  • the material of the insert element 7 should preferably already be biocompatible as it is in the insert element 7 in order to be suitable for use in the oral cavity of a patient.
  • a cavity 4 with a flat surface 6 can be arranged on the top of the milling body 1, wherein the cavity 4 can be laterally delimited by a circumferential wall 8.
  • the surface 6 is formed (preferably completely) by the solid body 2.
  • the circumferential wall 8 can consist of the material of the solid body 2 or of a different material.
  • the circumferential wall 8 can be an annular body or a piece of pipe that is plugged onto the solid body 2 and firmly connected to it there. The connection can be made by gluing.
  • the solid body 2 can be cylindrically shaped.
  • the solid body 2 can have a step on the outer circumference as a circumferential wall 8 for plugging on a ring body or piece of pipe, onto which the ring body or piece of pipe is plugged flush.
  • the circumferential wall 8 can in particular be a cylindrical piece of pipe.
  • the circumferential wall 8 can also be a metal ring body.
  • a marking 9 for determining a filling level in the cavity 4 can be arranged on an inner side of the surrounding wall 8 facing the cavity 4 or on an outer side of a surrounding transparent wall 8.
  • the marking 9 can also be attached to the surrounding wall 8 during the course of a process for producing a dental prosthesis, for example by being milled in.
  • the fluid polymerizable plastic (not shown in Figure 1) to be filled into the cavity 4 can be filled to the correct height.
  • a recess 3 is arranged in the surface 6 of the solid body 2, into which the insert element 7 or other insert elements (not shown) can be inserted or inserted.
  • At least one holder 10 for fixing the milling body 1 in a CAM device can be arranged on at least one outer wall of the milling body 1.
  • the holder 10 can protrude from the outer wall of the milling body 1 as an attached torus with a rectangular cross-sectional area.
  • the holder can also be realized in a different way, for example by protruding projections or by recesses in the side surfaces.
  • the holder 10 is used for fastening in a CAM device (not shown).
  • the milling body 1 according to Figure 1 can be used in a method according to the invention as follows.
  • the insert element 7 is inserted or plugged into the recess 3 and, if necessary, is embedded in the recess using an embedding material (such as a fluid
  • REPLACEMENT BLADE polymerizable plastic or a wax that is fluid when heated
  • the milling body 1 with the insert element 7 fastened therein is fixed in a subtractive CAM device, such as a computer-controlled multi-axis milling machine, with the aid of the holder 10.
  • a surface can be produced in the surface 6 and the insert element 7 that corresponds to the connecting surface between the material of the prosthetic teeth and the hardened plastic material to be produced from a fluid, polymerizable plastic in accordance with a virtual CAD model of a dental prosthesis.
  • the connecting surfaces between the prosthetic teeth and the prosthetic base can be manufactured exclusively in the insert element 7.
  • the occlusal or oral surfaces of the surfaces consisting of the hardened plastic material can be worked out of the solid body 2 as a negative mold using the subtractive CAM device.
  • An offset can be used so that the negative mold is worked somewhat deeper, preferably at least a few tenths of a millimeter deeper, into the solid body 2 than the occlusal or oral surface for the hardened plastic material according to the CAD model would require with a direct negative mold.
  • the marking 9 can be created on the peripheral wall 8 in this step. The newly created surface in the surface 6 of the solid body 2 and in the insert element 7 can then be cleaned.
  • the fluid polymerizable plastic (not shown) can then be filled into the cavity 4 to a height sufficient for the part of the dental prosthesis consisting of the hardened plastic material (the prosthesis base) to be completely machined out of the hardened plastic material on the basal side in accordance with the virtual CAD model.
  • the fluid polymerizable plastic can harden under the influence of pressure and temperature and forms the hardened plastic material.
  • the intermediate product can then be fastened again in the subtractive CAM device and the dental prosthesis is machined out using the CAM device based on the occlusal or oral surfaces and the basal surfaces of the virtual CAD model of the dental prosthesis.
  • the prosthetic teeth of the dental prosthesis then consist of the material of the insert element 7 and the prosthetic base of the dental prosthesis then consists of the hardened plastic material.
  • Figures 2 to 5 show the sequence of a method according to the invention using a second milling body 11 according to the invention.
  • Figure 2 shows a schematic perspective view of an upper side of the second milling body 11 according to the invention (left) and, to the right, a suitable insert element 17.
  • the milling body 11 has a solid body 12 made of a material that can be milled easily and precisely.
  • the material of the solid body 12 should not be too hard, but at the same time it should not crumble or break brittlely during milling.
  • the solid body 12 extends to a bottom side opposite the top of the milling body 11 (not visible in Figures 2 to 5).
  • the material for the insert element 17 can be a fully polymerized tooth-colored plastic that is suitable for the production of prosthetic teeth and has the necessary abrasion resistance for this purpose.
  • the material of the insert element 17 should preferably already be biocompatible as it is in the insert element 17 in order to be suitable for use in the oral cavity of a patient.
  • a surface 16 is arranged on the top of the milling body 11.
  • a recess 13 with a geometric shape matching the insert element 17 can be arranged in the surface 16 of the solid body 12.
  • the recess 13 can be delimited by side walls 14 and a base 15.
  • the insert element 17 can have side walls 18 of the insert element 17 that match the side walls 14 of the recess 13.
  • At least one holder 20 for fixing the milling body 11 in a CAM device can be arranged on at least one outer wall of the milling body 11.
  • the holder 20 can protrude from the outer wall of the milling body 11 as a torus with a rectangular cross-sectional area.
  • the holder can also be realized in a different way, for example by protruding projections or by recesses in the side surfaces.
  • the holder 20 is used for fastening in a CAM device (not shown).
  • a piece of pipe (not shown) can be fitted around the surface 16 as an annular wall.
  • the piece of pipe can be fitted or press-fitted onto the milling body 11, with a circumferential holder 20 serving as a stop.
  • the connection can be made by gluing.
  • a cavity with the surface 16 is laterally delimited by a circumferential wall. This can be done after machining the milling body 11 with a CAM device and before a fluid polymerizable plastic is filled onto the machined surface 16 and the machined insert element 17.
  • the surface 16 is formed (preferably completely) by the solid body 12.
  • the solid body 12 can be cylindrically shaped.
  • the insert element 17 can be inserted into the recess 13. This situation is shown in Figure 3. A gap remains between the side walls 14 of the recess 13 and the side walls 18 of the insert element 17.
  • the insert element 17 can be fixed in the recess 13. This situation is shown in Figure 4.
  • the gap between the insert element 17 and the recess can be
  • REPLACEMENT BLADE Purpose by filling an embedding material 22.
  • the embedding material 22 can be a wax, an adhesive or a fluid polymerizable plastic.
  • the embedding material 22 fixes and secures the insert element 17 in the recess 13 of the milling body 11.
  • the embedding material 22 can also be arranged between the bottom 15 of the recess 13 and the insert element 17. It is also possible to fill the embedding material 22 into the recess 13 before inserting the insert element 17.
  • the milling body 11 with the insert element 17 fastened in the recess 13 can then be fixed in a CAM device.
  • a virtual three-dimensional model of prosthetic teeth of a dental prosthesis to be produced these can be produced in the material of the insert element 17. This situation is shown in Figure 5, where two prosthetic teeth 26 have already been worked out to a very large extent from the fastened insert element 17.
  • the prosthetic teeth 26 have a basal connecting surface 24, which is intended for connection to a prosthetic base of the dental prosthesis.
  • the prosthetic teeth 26 can be completely worked out and then (if necessary after final processing) glued into a prosthetic base (not shown) to produce the finished dental prosthesis.
  • a method as in Figure 1 can also be used and the prosthetic base can be produced directly on the connecting surface 24.
  • the oral surface of the prosthesis base can also be preformed as a negative mold in the material of the solid body 12, in the embedding material 22 and in the material of the insert element 17, analogously to the method described in Figure 1.
  • FIG 6 shows a schematic perspective view of a top side (top in Figure 1) of a third milling body 31 according to the invention and several insert elements 37 underneath.
  • the milling body 31 preferably has a solid body 32 made of a material that can be milled easily and precisely.
  • the material of the solid body 32 should not be too hard, but at the same time should not crumble or break brittlely during milling.
  • the solid body 32 extends to a bottom side opposite the top side of the milling body 31 (not visible in Figure 6).
  • Differently colored and/or hard, fully polymerized tooth-colored plastics that are suitable for the manufacture of prosthetic teeth and have the necessary abrasion resistance can be used as the material for the insert elements 37.
  • the materials for the insert elements 37 should preferably already be biocompatible as they are in the insert element 37 in order to be suitable for use in the oral cavity of a patient.
  • a flat surface 36 can be arranged on the top of the milling body 31.
  • the surface 36 is formed (preferably completely) by the solid body 32.
  • the solid body 32 can be cylindrically shaped.
  • the recesses 33 are arranged in the surface 36 of the solid body 32, into which the insert elements 37 can be inserted or inserted individually or in groups.
  • the recesses 33 can be delimited by side walls 34 and a base 35.
  • the insert elements 37 can have side walls 38 of the insert element 37 that match the side walls 34 of the recess 33.
  • the insert elements 37 can be inserted into the recesses 33 individually or in groups, fitting or not fitting. Gaps can remain between the side walls 34 of the recesses 33 and the side walls 38 of the insert elements 37, or the insert elements 37 can be inserted into the recesses 33 with a press fit. If a gap or free space remains, these can be partially or completely filled with an embedding material (not shown in Figure 6).
  • the embedding material can be a wax, an adhesive or a fluid polymerizable plastic.
  • the embedding material can also be arranged between the bottom 35 of the recesses 33 and the insert elements 37. It is also possible to fill the embedding material into the recesses 33 before inserting the insert elements 37.
  • At least one holder 40 for fixing the milling body 31 in a CAM device can be arranged on at least one outer wall of the milling body 31.
  • the holder 40 can protrude from the outer wall of the milling body 31 as a torus with a rectangular cross-sectional area.
  • the holder can also be realized in a different way, for example by protruding projections or by recesses in the side surfaces.
  • the holder 10 is used for fastening in a CAM device (not shown).
  • the milling body 31 according to Figure 6 can be used in a method according to the invention as follows.
  • Several of the insert elements 37 are selected computationally using an insert element selection module to match a virtual three-dimensional model of prosthetic teeth of a dental prosthesis to be produced and are then inserted or plugged into the appropriate recesses 33 of the milling body 31 and, if necessary, secured in the recesses 33 using an embedding material (such as wax).
  • the milling body 31 with appropriate recesses 33 can be selected computationally beforehand using a milling body provision module, based on the virtual three-dimensional model of the prosthetic teeth or based on a virtual three-dimensional model of the dental prosthesis. The selection is made to match the prosthetic teeth and their arrangement in the dental prosthesis according to the virtual three-dimensional model of the dental prosthesis.
  • REPLACEMENT BLADE (RULE 26)
  • the milling body 31 with the insert elements 37 fastened therein is fixed in a subtractive CAM device, such as a computer-controlled multi-axis milling machine, using the holder 40.
  • a surface is produced in the surface 36 and the insert elements 37 as a negative mold, which corresponds to the connecting surface between the material of the prosthetic teeth and the hardened plastic material to be produced from the fluid polymerizable plastic in accordance with a virtual three-dimensional model of the dental prosthesis.
  • the connecting surfaces between the prosthetic teeth and the prosthetic base are manufactured exclusively in the insert elements 37.
  • the occlusal or oral surfaces of the surfaces consisting of the hardened plastic material are worked out with the subtractive CAM device as a negative mold from the solid body 32 and, if applicable, the embedding material.
  • An offset can be used so that the negative mold is worked somewhat deeper, preferably at least a few tenths of a millimeter deeper, into the solid body 32 than the occlusal or oral surface for the hardened plastic material according to the virtual three-dimensional model of the dental prosthesis would require with a direct negative mold.
  • the newly created surface in the surface 36 of the solid body 32 and in the insert elements 37 can then be cleaned.
  • a fluid polymerizable plastic (not shown) can then be added to the surface produced subtractively in this way, up to a height that is sufficient for the part of the dental prosthesis consisting of the hardened plastic material to be completely machined out of the hardened plastic material on the basal side in accordance with the virtual three-dimensional model.
  • the fluid polymerizable plastic can harden under the influence of pressure and temperature and forms a hardened plastic material from which a prosthesis base can be made.
  • the intermediate product can then be fastened again in the subtractive CAM device if necessary and the dental prosthesis is machined out using the CAM device based on the occlusal or oral surfaces and the basal surfaces of the virtual three-dimensional model of the dental prosthesis.
  • the prosthetic teeth of the dental prosthesis then consist of the material of the insert elements 37 and the prosthetic base of the dental prosthesis then consists of the hardened plastic material.
  • Figure 7 shows a schematic perspective transparent view of a side of the milling body 51 with an insert element 57 inserted into a recess 53 in a surface 56 of the milling body 52.
  • the illustration shows a cross-sectional view and a desired position of the dental prosthesis 82 to be produced (in the central area of Figure 7).
  • Figure 8 shows a schematic view of the top of the milling body 51 according to Figure 7 after the subtractive machining of the connecting surface and the negative mold 81 for the oral side of the prosthesis base 72
  • Figure 9 shows a schematic view of the basal side of the dental prosthesis 82 after the subtractive machining from the previously filled and then hardened plastic material.
  • Figure 10 shows a schematic view of the occlusal or oral side of the dental prosthesis 82 after subtractive machining from the material of the milling body 51, the material of the insert element 57 and the previously filled polymerized hardened plastic material.
  • the virtual CAD model of the dental prosthesis 82 is shown in Figure 7 in the desired position in the milling body 51 above the milling body 51 or in the milling body 51. As with some of the following figures, this serves to enable one to imagine how the dental prosthesis 82 to be produced lies in the milling body 51 before it has been machined out. This illustrates the sequence of the CAD processes.
  • the prosthetic teeth 66 are positioned in the milling body 51 in such a way that they are completely contained in the area of the insert elements 57 made of the material of the insert elements 57.
  • milling bodies 51 with suitable recesses 53 for inserting or plugging in the insert elements 57 can be selected or suitable recesses 53 can be created in the milling bodies 51.
  • suitable insert elements 57 can be selected and arranged in the appropriate recesses 53 of the milling body 51.
  • a suitable insert element 57 was inserted into the recess 53 with a press fit, so that pressure is exerted by the side walls 54 of the recess 54 on the side walls 55 of the insert element 57 and the insert element 57 is thereby secured in the recess 53 of the milling body 51.
  • the insert element 57 can also be embedded in the recess 53 with an embedding material (not shown) in order to secure the insert element 57 in the milling body 51.
  • the oral surface 69 of the denture base 72 and the connecting surface between the denture teeth 66 and the denture base 72 are created using a subtractive CAM device, such as a computer-controlled multi-axis milling machine, based on the virtual CAD model in the solid body 52 of the milling body 51 and in the inserted insert element 57.
  • a surface is created in the surface 56 and the insert element 57 using the virtual CAD model, which corresponds to the connecting surface between the material of the insert element 57 and the material of the solid body 52 on the one hand and the
  • REPLACEMENT BLADE (RULE 26) the hardened plastic material to be produced from the fluid polymerizable plastic according to the virtual CAD model on the other hand.
  • the oral surfaces 69 of the surfaces that will later consist of the hardened plastic material are machined out of the solid body 52 using the subtractive CAM device as a negative mold 81.
  • An offset can be used so that the negative mold 81 is machined at least a few tenths of a millimeter deeper into the solid body 52 than the oral surface 69 would actually require for the hardened plastic material.
  • the negative mold 81 thus serves as a casting mold for producing the oral side of the prosthesis base 72.
  • the surface produced in this way can be clearly seen in the schematic view of the top side of the milling body 51 machined in this way according to Figure 8.
  • connection surface between the prosthetic teeth 66 and the prosthetic base 72 in Figure 8 corresponds to the surface formed by the insert element 57, which is part of the prosthetic teeth 66 and which is already identified in Figure 8 as prosthetic teeth 66.
  • this connection surface of the prosthetic teeth 66 there are recesses 67 into which the fluid polymerizable plastic is filled to create a more stable connection.
  • a marking can be created on a peripheral wall 58.
  • the newly created surface can then be cleaned.
  • a cavity 54 shown in Figure 8 (analogous to Figure 1) can then be filled or plugged with the fluid polymerizable plastic up to the marking.
  • the fluid polymerizable plastic can then be cured (preferably under pressure and/or at an elevated temperature compared to room temperature) (preferably for 30 to 60 minutes) to form the cured plastic material from which the prosthesis base 72 is made.
  • FIG. 9 shows a schematic view of the basal side 70 of the dental prosthesis 82 after subtractive machining from the polymerized, cured plastic material, before the machining of the occlusal surface 68 and the oral surface 69 was completed and the dental prosthesis 82 was separated from the remaining milling body 51.
  • Figure 10 shows the dental prosthesis 82 detached from the surrounding wall 58. For final completion, cleaning, polishing and/or surface treatment of the dental prosthesis 82 can be carried out as post-processing.
  • REPLACEMENT BLADE (RULE 26)
  • RULE 26 REPLACEMENT BLADE
  • a virtual three-dimensional model of a dental prosthesis to be produced is calculated using CAD.
  • the virtual three-dimensional model of the dental prosthesis to be produced can have a support structure, but does not have to have a support structure.
  • a calculation is carried out, for example by file splitting, of the virtual three-dimensional model of the dental prosthesis into a tooth portion as a virtual three-dimensional model of the at least one prosthetic tooth 26 and a prosthetic base portion as a virtual three-dimensional model of the prosthetic base.
  • a virtual three-dimensional model of the support structure can also be calculated if the virtual three-dimensional model of the dental prosthesis has such a support structure.
  • a physical support structure can be created based on the virtual three-dimensional model of the support structure or the physical support structure is produced analogously and then scanned to create a virtual three-dimensional model of the support structure, wherein the surface of the virtual three-dimensional model of the at least one prosthetic tooth 26 is modified with the virtual three-dimensional model of the support structure.
  • the virtual three-dimensional model of the prosthetic base can also be adapted with the virtual three-dimensional model of the support structure.
  • a connection surface between the at least one prosthetic tooth 26 and the prosthetic base or between the at least one prosthetic tooth 26 and a support structure for positioning the support structure on the one hand and the prosthetic base and the support structure of the dental prosthesis on the other hand is calculated in the virtual three-dimensional model.
  • the surface to be produced in a milling body 11 is calculated, having the connection surface (if necessary with the support structure and if necessary with a separate mounting structure for the support structure, for example in the form of protruding webs, for attaching the support structure) using CAD methods.
  • the position and location of the at least one prosthetic tooth in the milling body is determined.
  • an insert element 17 is selected or several insert elements 17 are selected, the shape and volume of which, when suitably positioned, are capable of completely accommodating the prosthetic teeth 26,
  • REPLACEMENT BLADE optionally with an offset.
  • those insert elements 17 can be selected from available insert elements 17 for which the least loss of material of the insert elements 17 is to be expected due to their shape and volume.
  • An insert element selection module of an inventive device for implementing an inventive method can be used for this selection. This can be achieved by suitable programming of a computer.
  • a milling body 11 with a matching recess 13 or with matching recesses 33 that matches the at least one selected insert element 17 is selected from a database.
  • several existing milling bodies 1, 11, 31, 51 are stored in the database with an identifier and the position and orientation and the shape of the at least one recess 3, 13, 33, 53 in the respective milling body 1, 11, 31, 51.
  • the position and orientation of the insert elements 17 relative to one another can also be decisive in the selection. If no milling body 11, 31 with matching recesses 13, 33 is available, such a milling body 11 can be produced by milling from a milling body without recess(es) or with recess(es) that are too small.
  • a milling body provision module of a device according to the invention for implementing a method according to the invention can be used. This can also be achieved by suitable programming of a computer. If a new milling body with at least one recess is newly produced, the shape and position of the at least one recess can be stored in the database together with an identifier of the milling body, so that this new milling body is available for future selections.
  • the selected at least one insert element 17 is fastened in the at least one recess 13 of the selected milling body 11 by inserting the selected at least one insert element 17 into the at least one recess 13 of the selected milling body 11 and fastening it with an embedding material 22 (for example by gluing or pouring) or by inserting the selected at least one insert element 17 into the at least one recess 13 of the selected milling body 11 in a press fit.
  • an embedding material 22 for example by gluing or pouring
  • the selected milling body 11 with at least one insert element 17 fastened therein is fastened in a CAM device.
  • a ninth work step 108 the surface to be produced is created in a milling body surface 16 in the milling body 11 and in the insert element 17 and, if applicable, in the embedding material 22 using a subtractive CAM process.
  • REPLACEMENT BLADE (RULE 26)
  • the connecting surface or at least one prosthetic tooth is produced using the CAM process. This may create a cavity in the surface 16 of the milling body 11.
  • the support structure produced analogously or using CAM methods can be applied to the machined surface of the milling body 17 or fastened there.
  • a fluid polymerizable plastic is filled or plugged into the cavity.
  • the fluid polymerizable plastic is cured or partially cured, thus firmly connecting the processed at least one insert element to the polymerizable plastic and optionally to the support structure.
  • the dental prosthesis is subtractively worked out from the composite produced in the twelfth work step 111.
  • the dental prosthesis can then be post-cured or finally hardened in a fourteenth step 113.
  • the dental prosthesis can be finished, for example by surface treatment and/or polishing of the dental prosthesis.
  • the preferred steps 110, 111, 112 are only carried out if a dental prosthesis is to be manufactured directly from the prosthetic teeth).
  • Optional work step Manufacture of a support structure and, if necessary, create a virtual 3D model of the support structure
  • REPLACEMENT BLADE (RULE 26) Preferred work step: Filling fluid polymerizable plastic into the cavity in the milling body Preferred work step: Curing the fluid polymerizable plastic Preferred work step: Subtractive machining of the dental prosthesis using CAM processes Optional work step: Post-curing or final hardening of the dental prosthesis Optional work step: Final processing of the dental prosthesis

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Dental Prosthetics (AREA)

Abstract

L'invention concerne un procédé pour produire une prothèse dentaire selon un modèle tridimensionnel virtuel comprenant les étapes consistant à : A) générer le modèle au moyen d'un procédé CAO selon un modèle virtuel tridimensionnel d'une prothèse dentaire ; B) sélectionner un élément d'insertion (7) en fonction du modèle de dent prothétique ; C) sélectionner un corps de fraise (1) avec un creux (3) adapté ou générer un creux (3) adapté dans un corps de fraise (1) ; D) placer ou insérer l'élément d'insertion (7) dans le creux (3), l'élément d'insertion (7) ou plusieurs éléments d'insertion (7) placés les uns à côté des autres présentant conjointement la même forme géométrique que le creux (3) ; E) fixer l'élément d'insertion (7) dans le creux (3) ; F) fixer le corps de fraise (1) dans un dispositif CAM ; et G) usiner la dent prothétique au moyen du dispositif CAM, en fonction du modèle, à partir de l'élément ou des éléments d'insertion (7). Cette invention concerne en outre un système de corps de fraisage modulaire et un dispositif pour la mise en œuvre d'un tel procédé.
PCT/EP2024/065940 2023-06-13 2024-06-10 Production de de dents prothétiques optimisée en termes de consommation de matériau Ceased WO2024256329A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP24732607.7A EP4727486A1 (fr) 2023-06-13 2024-06-10 Production de de dents prothétiques optimisée en termes de consommation de matériau

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023115371.4A DE102023115371B4 (de) 2023-06-13 2023-06-13 Materialverbrauchsoptimierte Herstellung von Prothesenzähnen
DE102023115371.4 2023-06-13

Publications (1)

Publication Number Publication Date
WO2024256329A1 true WO2024256329A1 (fr) 2024-12-19

Family

ID=91530158

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/065940 Ceased WO2024256329A1 (fr) 2023-06-13 2024-06-10 Production de de dents prothétiques optimisée en termes de consommation de matériau

Country Status (3)

Country Link
EP (1) EP4727486A1 (fr)
DE (1) DE102023115371B4 (fr)
WO (1) WO2024256329A1 (fr)

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10304757B4 (de) 2003-02-05 2005-07-21 Heraeus Kulzer Gmbh Vorrichtung und Verfahren zur Herstellung von Zahnersatz
US20090023112A1 (en) 2007-07-20 2009-01-22 Ivoclar Vivadent Ag Addressable Matrices/Cluster Blanks for Dental CAD/CAM Systems and Optimization Thereof
DE102008019694B3 (de) 2008-04-17 2009-12-10 Hochschule Mittweida (Fh) Verfahren und Einrichtung zur automatischen Herstellung dentaler Körper aus Keramik mit einem Laser
DE102009056752A1 (de) 2009-12-04 2011-06-09 Heraeus Kulzer Gmbh Herstellung individueller dentaler Prothesen via CAD/CAM und Rapid Manufacturing/Rapid Prototyping aus Daten der digitalen Abdrucknahme
US20130101962A1 (en) 2011-09-27 2013-04-25 Devon O. Howe Denture and method and apparatus of making same
WO2013124452A1 (fr) 2012-02-22 2013-08-29 3Shape A/S Réduction et fraisage virtuels de dents artificielles
EP2666438A2 (fr) 2011-05-16 2013-11-27 Amann Girrbach AG Support pour une prothèse dentaire
EP2742906A1 (fr) 2012-12-17 2014-06-18 Ivoclar Vivadent AG Procédé et système de montage d'une prothèse dentaire
WO2014159436A1 (fr) 2013-03-14 2014-10-02 Global Dental Science Llc Système et procédé de production de dentiers
US20140317930A1 (en) * 2011-11-11 2014-10-30 Merz Dental Gmbh Milling block, method for producing partial or total prostheses, and complete milling block system
KR20160003528A (ko) 2014-07-01 2016-01-11 오세만 치과 치료용 보철물 제작을 위한 지그 및 그 지그를 이용한 치과 치료용 보철물 제작방법
WO2016091762A1 (fr) 2014-12-09 2016-06-16 Heraeus Kulzer Gmbh Procédé pour fabriquer une prothèse dentaire avec un gabarit
WO2016110392A1 (fr) 2015-01-07 2016-07-14 Heraeus Kulzer Gmbh Procédé de fabrication d'une prothèse dentaire
EP2915503B1 (fr) 2014-03-03 2016-08-24 Global Dental Science, LLC Système et procédé de fabrication de prothèses dentaires en couches
US20200214812A1 (en) * 2015-03-04 2020-07-09 Ivoclar Vivadent Ag Method Of Producing A Dental Prosthesis

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015004759U1 (de) * 2015-06-29 2015-12-01 Medentic Deutschland Gmbh Halterung für Material zum Herstellen von Zahnschienen oder Zahnersatz mit Fräsmaschinen

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10304757B4 (de) 2003-02-05 2005-07-21 Heraeus Kulzer Gmbh Vorrichtung und Verfahren zur Herstellung von Zahnersatz
US20090023112A1 (en) 2007-07-20 2009-01-22 Ivoclar Vivadent Ag Addressable Matrices/Cluster Blanks for Dental CAD/CAM Systems and Optimization Thereof
DE102008019694B3 (de) 2008-04-17 2009-12-10 Hochschule Mittweida (Fh) Verfahren und Einrichtung zur automatischen Herstellung dentaler Körper aus Keramik mit einem Laser
DE102009056752A1 (de) 2009-12-04 2011-06-09 Heraeus Kulzer Gmbh Herstellung individueller dentaler Prothesen via CAD/CAM und Rapid Manufacturing/Rapid Prototyping aus Daten der digitalen Abdrucknahme
EP2666438A2 (fr) 2011-05-16 2013-11-27 Amann Girrbach AG Support pour une prothèse dentaire
EP2571451B1 (fr) 2011-05-16 2014-03-26 Amann Girrbach AG Support de dents prothétiques
US20130101962A1 (en) 2011-09-27 2013-04-25 Devon O. Howe Denture and method and apparatus of making same
US20140317930A1 (en) * 2011-11-11 2014-10-30 Merz Dental Gmbh Milling block, method for producing partial or total prostheses, and complete milling block system
WO2013124452A1 (fr) 2012-02-22 2013-08-29 3Shape A/S Réduction et fraisage virtuels de dents artificielles
EP2742906A1 (fr) 2012-12-17 2014-06-18 Ivoclar Vivadent AG Procédé et système de montage d'une prothèse dentaire
WO2014159436A1 (fr) 2013-03-14 2014-10-02 Global Dental Science Llc Système et procédé de production de dentiers
EP2915503B1 (fr) 2014-03-03 2016-08-24 Global Dental Science, LLC Système et procédé de fabrication de prothèses dentaires en couches
KR20160003528A (ko) 2014-07-01 2016-01-11 오세만 치과 치료용 보철물 제작을 위한 지그 및 그 지그를 이용한 치과 치료용 보철물 제작방법
WO2016091762A1 (fr) 2014-12-09 2016-06-16 Heraeus Kulzer Gmbh Procédé pour fabriquer une prothèse dentaire avec un gabarit
WO2016110392A1 (fr) 2015-01-07 2016-07-14 Heraeus Kulzer Gmbh Procédé de fabrication d'une prothèse dentaire
US20200214812A1 (en) * 2015-03-04 2020-07-09 Ivoclar Vivadent Ag Method Of Producing A Dental Prosthesis

Also Published As

Publication number Publication date
EP4727486A1 (fr) 2026-04-22
DE102023115371A1 (de) 2024-12-19
DE102023115371B4 (de) 2025-01-23

Similar Documents

Publication Publication Date Title
EP3229724B1 (fr) Procédé pour fabriquer une prothèse dentaire avec un gabarit
DE102012007706B4 (de) Verfahren zum Herstellen eines künstlichen Gebisses
DE202017101184U1 (de) Dreidimensionaler kieferorthopädischer Retainer
DE102012011238A1 (de) Verfahren zur Herstellung eines Laboranalogs für Dentalimplantate
DE102015101978B3 (de) Erstellen einer Wachs- oder Kunststoffbasis zur Fertigung einer Dentalprothese
WO2020178195A1 (fr) Procédé de fabrication d'un corps moulé et corps moulé
DE102017113814A1 (de) Verfahren zur Herstellung einer Dentalprothese mit definiertem Klebespalt
DE102022134561B4 (de) Verfahren zur Herstellung einer Dentalprothese durch Auffüllen eines Zwischenraums
WO2016050600A1 (fr) Moule servant à fabriquer une ébauche de base de prothèse préformée
EP3852677B1 (fr) Demi-produit pour la fabrication de dents prothétiques et procédé pour sa fabrication et son traitement
DE102023115371B4 (de) Materialverbrauchsoptimierte Herstellung von Prothesenzähnen
EP0796063B1 (fr) Procede de fabrication "sur mesure" d'articles prothetiques dentaires et procede de soins dentaires au moyen desdits articles
DE102023109570B4 (de) Verfahren zur Herstellung einer dentalen Teilprothese mit Trägerstruktur
WO2018069117A1 (fr) Ébauche de plaque-base de prothèse préformée prise dans de la cire
DE102021112178B4 (de) Verfahren und Vorrichtung zur Herstellung einer Dentalprothese
DE102024130874A1 (de) Verfahren zur Herstellung einer Dentalprothese mit Stützstruktur
DE102022101992A1 (de) Fräsrohling und Verfahren zur Herstellung eines dentalen Formkörpers
DE102024123889A1 (de) Verfahren zur Herstellung einer Dentalprothese mit einem Fixierschlüssel als Abstandshalter
DE102018125083A1 (de) Verfahren zur Herstellung einer Zahnprothese
WO2015144316A1 (fr) Procédé de fabrication d'une couronne dentaire prothétique et utilisation spéciale d'une couronne dentaire

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24732607

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2024732607

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2024732607

Country of ref document: EP

Effective date: 20260113

ENP Entry into the national phase

Ref document number: 2024732607

Country of ref document: EP

Effective date: 20260113

ENP Entry into the national phase

Ref document number: 2024732607

Country of ref document: EP

Effective date: 20260113

ENP Entry into the national phase

Ref document number: 2024732607

Country of ref document: EP

Effective date: 20260113

WWP Wipo information: published in national office

Ref document number: 2024732607

Country of ref document: EP