EP2211823A2 - Zahnimplantat und prothese-vorbereitungskit und methoden dafür - Google Patents

Zahnimplantat und prothese-vorbereitungskit und methoden dafür

Info

Publication number
EP2211823A2
EP2211823A2 EP08838989A EP08838989A EP2211823A2 EP 2211823 A2 EP2211823 A2 EP 2211823A2 EP 08838989 A EP08838989 A EP 08838989A EP 08838989 A EP08838989 A EP 08838989A EP 2211823 A2 EP2211823 A2 EP 2211823A2
Authority
EP
European Patent Office
Prior art keywords
methacrylate
acrylate
dimethacrylate
porous block
kit
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.)
Withdrawn
Application number
EP08838989A
Other languages
English (en)
French (fr)
Inventor
Kai Zhang
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.)
Zimmer Dental Inc
Original Assignee
Zimmer Dental Inc
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
Priority claimed from US11/873,055 external-priority patent/US20090098511A1/en
Priority claimed from US11/873,018 external-priority patent/US20090098510A1/en
Application filed by Zimmer Dental Inc filed Critical Zimmer Dental Inc
Publication of EP2211823A2 publication Critical patent/EP2211823A2/de
Withdrawn legal-status Critical Current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
    • A61C13/0022—Blanks or green, unfinished dental restoration parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/802—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics
    • A61K6/818—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics comprising zirconium oxide
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/831—Preparations for artificial teeth, for filling teeth or for capping teeth comprising non-metallic elements or compounds thereof, e.g. carbon
    • A61K6/838—Phosphorus compounds, e.g. apatite
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/84—Preparations for artificial teeth, for filling teeth or for capping teeth comprising metals or alloys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
    • A61K6/887—Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools

Definitions

  • the present invention relates to a kit for preparing dental implant and prosthetic devices and, in particular, to an in-house preparation kit that provides for assembly and shaping of the dental implant and prosthetic device.
  • a dental implant or fixture is surgically implanted into a patient's upper or lower jaw to directly or indirectly anchor and support prosthetic devices, such as an artificial tooth.
  • the implants are usually placed at one or more edentulous sites in a patient's dentition at which the patient's original teeth have been lost or damaged in order to restore the patient's chewing function.
  • the implant anchors a dental abutment, which in turn provides an interface between the implant and a prosthesis also called a dental restoration or artificial tooth that has the exterior shape of a tooth.
  • the artificial tooth is typically a porcelain crown fashioned according to known methods.
  • the prosthetic devices which include the implant and the abutment, are provided in standard sizes and are typically implanted before the prosthesis is mounted on it in the patient's mouth.
  • More recent dental prosthetic devices have complex manufacturing processes that use metallic and ceramic materials. These are used to form more durable prosthetic devices and prosthetic devices more esthetically pleasing where the prosthetic device is exposed apically of the outer edge of a tooth-shaped prosthesis and above the gum line for instance.
  • the prosthetic device may also be provided with an esthetically pleasing color when the prosthesis is transparent or translucent such that the color of the prosthetic device affects the color of the prosthesis. Due to the complexity of the materials and processes, the dental practitioner is unable to produce such a high-quality prosthetic device in-house.
  • the artificial tooth or prosthesis is typically made in at least two separate stages: a scanning/molding stage and a machining stage.
  • a scanning/molding stage a mold or a cast of a patient's tooth is made, typically in the dental office, and the mold is then sent out to a third- party or otherwise external lab.
  • a prosthetic device or analog of an appropriate standard size of the prosthetic device is placed on the mold, and the mold is then used to make a model of the mouth.
  • the dental prosthesis or restoration is mounted on the prosthetic device or analog on the model and shaped, and/or the model is used to cast the restoration into a tooth shape with other mold pieces providing the exterior coronal shape of the tooth.
  • this method requires that the prosthetic device and prosthesis be made at two different times and with at least two patient office visits with a wait between the office visits to have the artificial tooth molded and implanted.
  • the prosthesis may be returned to the dental office with incorrect dimensions. If the errors are major, the external lab will need to remake the prosthesis and new molds may need to be made. If the errors are minor, this may require the dental practitioner to finely shape the prosthetic device to get the prosthesis to fit on the prosthetic device or between adjacent teeth in the patient's mouth, which causes even further delay.
  • Some dental restorations such as crowns, veneers, inlays, or onlays may be made in-house.
  • the dental practitioner can take a digital scan of the patient's mouth and output that scan to a milling machine.
  • the milling machine uses the scan to cut and shape a solid ceramic piece to match a desired tooth shape indicated on the scan. This allows the dental practitioner to complete the procedure of scanning the tooth, cutting the ceramic piece and implanting the resulting restoration all in-house and in the same day, if desired.
  • This method has so far been limited to restorations made of simple materials such as the piece of ceramic.
  • ways to provide high quality prosthetic devices in-house, in addition to the prosthesis are desired.
  • FIG. 1 is a schematic block diagram representing a simplified kit in accordance with the present invention
  • FIG. 2 is a flow diagram of a process for making a dental prosthetic implant device from a kit in accordance with the present invention.
  • FIG. 3 is a flow diagram of an alternative process for making a dental prosthetic implant device from a kit in accordance with the present invention.
  • a preparation kit 10 has a porous block 12, a thermoset polymeric resin 14, and an initiator 16 to be used in-house to create a final prosthetic device that will be cut and shaped to support a restoration or to integrally provide an artificial tooth.
  • the prosthetic device created from the kit 10 comprises a highly durable and esthetically pleasing (i.e., tooth colored in appearance) dental device.
  • the term "in-house” herein means that the dental device can be prepared in one location at the site of a dental procedure, such as a dental office or a dental practitioner's place of business, and does not require molds being sent to an external location or lab to be used by a third-party.
  • Dental practitioner hereinafter will include a dentist, a dental technician, dental surgeon, a dental hygienist, or anyone employed in a dental office.
  • the kit 10 may have a container or package 18 such as a bag for holding the porous block 12.
  • the resin 14 may be held in its own container 20, such as a substantially air tight and substantially opaque bottle, box, or bag; preferably a bottle is used when the resin is in liquid form. Air tight herein means sufficiently sealed to substantially restrict the flow of oxygen into the relevant container.
  • the initiator 16 is also in its own substantially air tight and substantially dark colored or opaque container 22 to keep it substantially separated from the resin 14 to limit any unintentional reaction with the resin.
  • the kit 10 may also have a container 24 such as a box, bag, or bottle to hold all three elements of the kit: block 12, resin 14, and initiator 16.
  • the packaging of the kit 10 includes having one container 24, whether air tight and/or opaque or not, for holding one smaller container for each of the three elements. It will also be understood that one package may be opaque while an inner or outer package may be sealed. At least one of the packages may be air tight and/or opaque, or all of them may be.
  • the dental practitioner removes the porous block 12 from the kit 10 and mixes together the resin 14 and the initiator 16 in amounts indicated on instructions provided on or in the kit 10. Once the resin 14 and initiator 16 are mixed together, a resin mixture is formed which can then be placed on the porous block 12 such that the resin mixture infiltrates pores of the porous block. The resin mixture on the porous block 12 then cures in situ by polymerization of the resin mixture via light or heat that penetrates the porous block. The porous block 12 may then be cut to form the final prosthetic dental device with a size particularly customized to fit on a patient's jaw and between adjacent teeth.
  • the prosthetic device made from the kit 10 may include an implant, an abutment, a one-piece dental implant or other type of dental fixture.
  • the porous block 12 is made of at least one of the following: a porous ceramic, a porous metal, or a porous polymer, or a porous composite material.
  • a porous ceramic block is preferred.
  • the porous block can have a porosity range of about 30% to about 90% and a pore size distribution of about 10 to about 1000 microns.
  • a porous ceramic material may comprise at least one element selected from the group consisting of: alumina, zirconia, hydroxyapatite, or layered ceramic fabrics such as 3M Nextel 610 alumina fabrics, for example, available from 3M Company, St. Paul, Minnesota.
  • a porous metal may comprise at least one element selected from the group consisting of: titanium, tantalum, CoCrMo, stainless steel, and zirconium.
  • a porous metal portion may comprise a porous tantalum portion which is a highly porous biomaterial useful as a bone substitute and/or cell and tissue receptive material.
  • An example of such a material is produced using Trabecular MetalTM technology generally available from Zimmer, Inc., of Warsaw, Indiana. Trabecular MetalTM is a trademark of Zimmer Technology, Inc.
  • a porous polymer may comprise at least one element selected from the group consisting of: poly aryl ether ketone (PAEK), polyether ether ketone (PEEK), polyether ether ketone (PEKK), polymethylmethacrylate (PMMA), and ultra high molecular weight polyethylene (UHMWPE).
  • PAEK poly aryl ether ketone
  • PEEK polyether ether ketone
  • PEKK polyether ether ketone
  • PMMA polymethylmethacrylate
  • UHMWPE ultra high molecular weight polyethylene
  • a porous composite material may comprise at least one the following combinations: polymer and ceramic fibers, polymer and metallic fibers, metal and polymer coatings, metal and ceramic coatings, ceramic and polymer coatings, and ceramic and metal coatings.
  • polymer and metallic fiber composite material is disclosed in detail in commonly owned U.S. Patent Application Nos. 11/420,024 and 1 1/622,171, which are fully incorporated herein by reference.
  • the porous block 12 that is provided in the kit is made of the composite polymer and metallic fibers where the polymer provides the bulk of the matrix forming the porous block 12 and the metallic fiber is a reinforcing material.
  • the composite material may also be pre-mixed with a colorant to form an esthetically pleasing color.
  • a further resin mixture is then placed on and in the composite material.
  • the porous block 12 is made of the polymer matrix material and the resin mixture that is added at the dental office includes the reinforcing material and the colorant.
  • the matrix material may be a polyaryl ether ketone (PAEK) such as polyether Ketone Ketone (PEKK), polyether ether ketone (PEEK), polyether ketone ether ketone ketone (PEKEKK), polymethylmethacrylate (PMMA), polyetherimide, polysulfone, and polyphenylsulfone.
  • PAEK polyaryl ether ketone
  • the polymers can also be a thermoset material including, without limitation, bisphanol glycidyl methacrylate (Bis-GMA), urethane dimethacrylate (UDMA), methylmethacrylate (MMA), triethylene glycol dimethacrylate (TEGDMA), a combination of thermoset plastics, or a combination of thermoset and thermoplastics. Additionally, they can be comprised of, without limitation, a large class of monomers, oligomers and polymers, such as acrylics, styrenics and other vinyls, epoxies, urethanes, polyesters, polycarbonates, polyamides, radiopaque polymers and biomaterials.
  • Bis-GMA bisphanol glycidyl methacrylate
  • UDMA urethane dimethacrylate
  • MMA methylmethacrylate
  • TEGDMA triethylene glycol dimethacrylate
  • thermoset plastics or a combination of thermoset and thermoplastics.
  • the reinforcing material may comprise, to name a few possible examples, at least one selected from the group comprising: carbon, Al 2 ⁇ 3 , ZrO 2 , Y 2 O3, Y 2 C> 3 -stabilized ZrO 2 , MgO-stabilized ZrO 2 , E-glass, S-glass, bioactive glasses, bioactive glass ceramics, calcium phosphate, hydroxyapatite, TiO 2 , Ti, Ti 6 Al 4 V, stainless steel, polyaryl ether ketones (PAEK) such as polyethyl ethyl ketone (PEEK), polyethyl ketone ketone (PEKK), and an aramid.
  • the geometry of the reinforcing material may include fibers, particulates, variable diameter fibers and fibers fused with particulates on the fiber surfaces.
  • the colorant may be titanium dioxide as one example.
  • the composite material may comprise about 55% by weight of the composite material of PEKK as the matrix material, about 35% by weight of the composite material of E-glass fibers as the reinforcing material, and about 10% by weight of the composite material of titanium dioxide particles as the colorant.
  • the composite material may comprise about 53% by weight of the composite material of PEKK, as the matrix material, about 35% by weight of the composite material of E-glass fibers as the reinforcing material, and about 12% by weight of the composite material of titanium dioxide particles as the colorant.
  • the thermoset polymeric resin 14 may comprise a light-curable, thermoset acrylic resin, such as Bisphenol-A-glycidyldimethacrylate (BisGMA), triethylene glycol dimethacrylate (TEGDMA), or urethane dimethacrylate (UDMA).
  • a light-curable, thermoset acrylic resin such as Bisphenol-A-glycidyldimethacrylate (BisGMA), triethylene glycol dimethacrylate (TEGDMA), or urethane dimethacrylate (UDMA).
  • the resins 14 may have a weight ratio of BisGMA to TEGDMA from 9: 1 to 1 :9.
  • the thermoset resins 14 may further be stabilized by stabilizers.
  • stabilizers that may be used for BisGMA and TEGDMA may comprise Topanol O®, i.e., in an amount of about 200 ppm, and hydroquinone methyl ether (HQME), i.e., in an amount of 100 ppm, respectively.
  • Topanol O® i.e., in an amount of about 200 ppm
  • HQME hydroquinone methyl ether
  • thermoset polymeric resin materials that may be used can include, without limitation, one or more of the following elements: acenaphthylene, 3- aminopropyltrimethoxysilane, diglycidyletherbisphenol, 3- glycidylpropyltrimethoxysilane, tetrabromobisphenol-A -dimethacrylate, polyactide, polyglycolide, 1,6-hexamethylene dimethacrylate, 1,10-decamethylene dimethacrylate, benzyl methacrylate, butanediol monoacrylate, 1,3 -butanediol diacrylate (1,3-butylene glycol diacrylate), 1,3-butylene glycol dimethacrylate), 1 ,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, n-butyl acrylate, n-butyl methacrylate, t-butyl acryl
  • the initiator 16 is mixed with the resin 14 which causes polymerization of the resin mixture when exposed to light or heat.
  • the initiator 16 can be present in amounts from about 0.2 wt% to about 5 wt% of the resin.
  • Initiators 16 may be in a powder form and can comprise initiators for thermal curing such as benzoyl peroxide or dicumyl peroxide, in amounts of about 0.5 wt% to about 5 wt% relative to the resin, and more preferably in an amount of about 1 wt%.
  • Initiators 16 that are used with light curing may comprise ethyl 4- dimethylaminobenzoate (4E) or camphorquinone (CQ), such as is available from Aldrich, in Milwaukee, Wisconsin.
  • Typical amounts used of the light curing initiators may be about 0.8 wt% of 4E and about 0.2 wt% of CQ, relative to the resin.
  • the dental practitioner first obtains a replica of the patient's jaw, gingival tissue, tooth to be replaced, and the adjacent teeth in order to determine the proper size and shape of prosthetic device that is needed. This can be done by the dental practitioner in any format that would allow for a relatively immediate result, so that the porous block 12 can thereafter be shaped to fit on the jaw, between adjacent teeth, and support a restoration. It may alternatively be shaped further if the prosthetic device is integrally providing the coronal shape of the tooth.
  • a preferred method is to obtain a digital scan of the patient's tooth and/or mouth which can be obtained utilizing a digital dental system (DDS), for example, which allows the dental practitioner to take a digital scan of the patient's mouth to determine the size and shape of the patient's dental anatomy.
  • the DDS results in a 3 -dimensional structure that can be converted via computer software to be sent as an input to a cutting mechanism.
  • the DDS can convert an analog image of the anatomy to a digital image.
  • a detector is used to convert the transmitted light of a conventional radiograph or the remnant x-ray beam into an electronic signal.
  • the electronic signal is then converted from an analog form to a digital form.
  • the digital image from the digital scan is used to generate a design (CAD) which can then be sent to the cutting mechanism and used as the shape to which the porous block 12 is cut.
  • CAD design
  • the cutting mechanism may comprise a rapid prototyping machine or similar machines that cuts the porous block 12 to the desired shape as obtained from the digital scan. Rapid prototyping takes virtual designs from computer aided design (CAD) or animation modeling software, transforms them into thin horizontal cross sections, still virtual, and then creates each cross section in physical space, one after the other until the model is finished [0027] Referring to Fig. 2, one possible method of making the prosthetic dental device includes first obtaining (step 200) a digital scan of the patient's mouth, utilizing for example a DDS. The scan is then converted to a CAD format, or other comparable format, and is sent to a cutting mechanism such as the rapid prototyping machine.
  • CAD computer aided design
  • animation modeling software transforms them into thin horizontal cross sections, still virtual, and then creates each cross section in physical space, one after the other until the model is finished
  • the rapid prototyping machine can then cut the porous block 12 to the desired shape based upon the digital scan obtained (step 202).
  • the resin 14 and the initiator 16 are combined and mixed together to form the resin mixture (step 204). If the resin 14 or initiator 16 is light-curable, then the mixing should be performed in relatively dark conditions.
  • the resin mixture is added (step 206) to the shaped porous block 12 and the mixture infiltrates the pores of the block. After the pores have been infiltrated with the resin mixture, the infiltrated block is polymerized (step 208), via light or heat depending upon the type of resin used, to cure the resin mixture and prepare the esthetic composite device for implanting into a patient's mouth.
  • a light curing process such as a Triad 2000 from Dentsply International Inc., in York, Pennsylvania, can be used if light-curing is necessary.
  • a low-temperature furnace may be used.
  • fine machining may be performed to finalize the shape of the infiltrated block if only a rough cut out was previously made.
  • the infiltrated block 12 has been transformed into the final prosthetic device to be used by the dental practitioner to implant into the patient's mouth (step 210).
  • the porous block 12 may not be cut or shaped until after it is infiltrated by the resin mixture.
  • the digital scan is taken (step 300), and the resin 14 and initiator 16 are then mixed (step 302) to form the resin mixture.
  • the patient may be scanned and the digital scan developed for the cutting mechanism before, during or after the resin mixture is formed, the mixture is poured on the un-shaped, un-cut porous block 12 to infiltrate the block's pores (step 304), or the resin mixture is polymerized (step 306), preferably whichever saves the most time for the dental practitioner.
  • the resin 14 and/or initiator 16 are light-curable, then the mixing needs to be performed in relatively dark conditions.
  • the block 12 is disposed for cutting and shaping by the rapid prototyping machine.
  • the previously obtained digital scan is converted to a CAD format, or other comparable format, and is sent to the rapid prototyping machine.
  • the rapid prototyping machine can then cut the infiltrated porous block 12 to the desired shape (step 308) based upon the digital scan obtained. Once the infiltrated block 12 is cut, the final prosthetic device is ready to be implanted into the patient's mouth (310).

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Plastic & Reconstructive Surgery (AREA)
  • Dentistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Dental Preparations (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
EP08838989A 2007-10-16 2008-10-15 Zahnimplantat und prothese-vorbereitungskit und methoden dafür Withdrawn EP2211823A2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/873,055 US20090098511A1 (en) 2007-10-16 2007-10-16 Method of making a dental implant and prosthetic device
US11/873,018 US20090098510A1 (en) 2007-10-16 2007-10-16 Dental implant and prosthetic device preparation kit
PCT/US2008/079926 WO2009052139A2 (en) 2007-10-16 2008-10-15 Dental implant and prosthetic device preparation kit and methods therefor

Publications (1)

Publication Number Publication Date
EP2211823A2 true EP2211823A2 (de) 2010-08-04

Family

ID=40394475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08838989A Withdrawn EP2211823A2 (de) 2007-10-16 2008-10-15 Zahnimplantat und prothese-vorbereitungskit und methoden dafür

Country Status (2)

Country Link
EP (1) EP2211823A2 (de)
WO (1) WO2009052139A2 (de)

Cited By (2)

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CN107213527A (zh) * 2017-06-30 2017-09-29 南宁越洋科技有限公司 三维多孔道骨组织工程支架材料人工牙的制备方法
CN108986618A (zh) * 2018-06-07 2018-12-11 中国人民解放军第四军医大学 用于实验教学的仿真人工牙的制备方法

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US10350297B2 (en) 2014-10-31 2019-07-16 3M Innovative Properties Company Dental materials and methods
CN112209728A (zh) * 2020-10-28 2021-01-12 衡阳凯新特种材料科技有限公司 一种光固化氮化硅陶瓷及其制备方法
TR2024000630A2 (tr) * 2024-01-19 2024-04-22 Dogan Imam Di̇ş kaplama maki̇nesi̇

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN107213527A (zh) * 2017-06-30 2017-09-29 南宁越洋科技有限公司 三维多孔道骨组织工程支架材料人工牙的制备方法
CN107213527B (zh) * 2017-06-30 2020-01-31 南宁越洋科技有限公司 三维多孔道骨组织工程支架材料人工牙的制备方法
CN108986618A (zh) * 2018-06-07 2018-12-11 中国人民解放军第四军医大学 用于实验教学的仿真人工牙的制备方法

Also Published As

Publication number Publication date
WO2009052139A2 (en) 2009-04-23
WO2009052139A3 (en) 2011-03-24

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