EP2091462A2 - Procédé pour déterminer le retrait de frittage d'un corps préfritté - Google Patents

Procédé pour déterminer le retrait de frittage d'un corps préfritté

Info

Publication number
EP2091462A2
EP2091462A2 EP07819599A EP07819599A EP2091462A2 EP 2091462 A2 EP2091462 A2 EP 2091462A2 EP 07819599 A EP07819599 A EP 07819599A EP 07819599 A EP07819599 A EP 07819599A EP 2091462 A2 EP2091462 A2 EP 2091462A2
Authority
EP
European Patent Office
Prior art keywords
sintering
detected
shrinkage
white
green
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Withdrawn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
EP07819599A
Other languages
German (de)
English (en)
Inventor
Stefan Köbel
Wolfram Weber
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.)
Metoxit AG
Original Assignee
Metoxit AG
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 Metoxit AG filed Critical Metoxit AG
Publication of EP2091462A2 publication Critical patent/EP2091462A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/0063—Control arrangements
    • B28B17/0072—Product control or inspection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/0031—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects with product identification means, e.g. labels on test products or integrated circuit tags inside products RFID
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/486—Fine ceramics
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
    • G16Z99/00—Subject matter not provided for in other main groups of this subclass
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/76—Crystal structural characteristics, e.g. symmetry
    • C04B2235/765—Tetragonal symmetry
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/94—Products characterised by their shape
    • C04B2235/945—Products containing grooves, cuts, recesses or protusions
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • C04B2235/9615—Linear firing shrinkage
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H20/00—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance
    • G16H20/40—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture

Definitions

  • the invention relates to a method for determining the sintering shrinkage of a pre-sintered white body.
  • pre-sinter greenware into a white body and process it later.
  • the further processing can be, for example, a machining and / or sintering.
  • the pre-interval is not apparent from external features of the white body.
  • the pre-sintering has a considerable influence on the shrinkage of the white body during sintering. Therefore, it is necessary to determine the pre-interval and to provide the white with the information about the shrinkage during sintering to the fired component.
  • WO 99/47065 an invention is described, which relates to a method and a blank for the production of artificial dental crowns and / or dental bridges, which fit at least on a prepared stump.
  • the disadvantage here is that in the manufacture of the artificial denture, a magnification factor to compensate for the shrinkage must be considered, which is calculated consuming from the density of the white compact and the achievable density of the sintered body after sintering.
  • the object is therefore to provide a method for determining the magnification factor, which can be carried out quickly.
  • a green compact is provided with at least one design feature, the green compact is pre-sintered into a white, a change in the Design feature is detected during pre-sintering and determined using the detected change in the expected sintering shrinkage.
  • any ceramic body can be used, which is pre-sintered in a later process to a white body.
  • the white body is sintered in a further subsequent process step to form a sintered body.
  • the green compact is preferably made of metal or ceramic and more preferably of technical ceramics.
  • the green compact is preferably produced by casting, plastic molding and more preferably by pressing.
  • the shape feature preferably indicates a dimension of the white body. It is particularly preferably designed such that a measuring means for measuring can be applied thereto. Grooves and bores, particularly preferably suitably designed surfaces and edges, are preferably used as structural features.
  • the green compact is compacted, but not yet compacted as much as by sintering. This is preferably achieved by a lower temperature than during sintering.
  • the white body is preferably mechanically processed before it is finally sintered. During presintering, pre-compaction and pre-shrinkage of the green body takes place.
  • the design feature can be detected manually, for example with a vernier caliper or micrometer. Preferably, it is detected automatically, for example in a measuring machine, particularly preferably in a processing machine. Upon detection, it is preferable the size of a gestalt feature, particularly preferably the distance between two gestalt features detected.
  • a magnification factor can be determined in a simple manner. With this magnification factor, the white body can be processed so that the expected shrinkage is taken into account. The machining can thereby be adjusted so that machining operations on the sintered body are minimized.
  • the detected dimensional change between the state that the shape feature has in the green compact and the state that it has in the white compact is related to the change that has the shape characteristic between the state in the white state and the state in the green state Sintered body has.
  • the properties of the raw material, the production of the green compact and the sintered body are adjusted so precisely that the expected shrinkage from the white body to the sintered body can be determined by measuring the design features.
  • the shape feature is preferably detected prior to mechanical processing of the white body. As a result, the shrinkage during sintering can be determined particularly accurately.
  • the second number of green bodies is a random sample.
  • a length is measured on each white of the first number of whites. This makes it possible to determine a feature that is particularly easy to measure.
  • a length is measured which is determined by a design feature. This makes it possible to specify by the design feature a length that is to be measured.
  • the changes in the shape characteristics during sintering are detected to the densely sintered component. This captures the changes in design features throughout the process. As a result, it is possible to determine the expected sintering shrinkage of the first number of white pieces with particular accuracy.
  • the density is detected for the second number of green bodies. This makes it possible to obtain information about the size of the possible shrinkage.
  • the density after sintering is detected as the densely sintered component. This makes it possible to obtain a particularly accurate statement about the size of the possible shrinkage.
  • the green compact is provided by pressing with the design feature.
  • the shape feature can be incorporated in a green compact formed by pressing directly during pressing of the green compact. A separate manufacturing step is not required.
  • the shape feature tool can be integrated into the green tool press tool.
  • the green compact is provided by machining with the design feature. This gives great freedom in the choice of the shape and the orientation of the design features on the green body.
  • milling, grinding and particularly preferably drilling are used as cutting machining methods. Because there are many freedoms in the design of the design features when using these machining methods, they can be placed at particularly suitable locations.
  • the shape features can be provided, for example, at locations where there is a particularly large mass accumulation. If different shrinkages are expected in certain directions, the pattern features are preferably oriented so that the dimensions to be detected are pointing in these directions.
  • the design feature is detected after pre-sintering in a processing machine.
  • a processing machine any machine can be used, which can handle Baumlinge.
  • CAD / CAM processing machines are used here.
  • Particularly preferred CAD / CAM milling and grinding machines are used.
  • complicated geometries can be reliably generated.
  • the predicted shrinkage of the component during sintering of the white compact can thus be taken into account in the processing in a simple manner.
  • the distance between two design features of each other is detected and determined with the detected result, the expected shrinkage during sintering. This makes it possible to make the green compact in large areas without having to introduce design features and still capture values of a comparatively long distance.
  • two spaced apart holes are introduced into the green body. These are designed as through holes, preferably as blind holes. After pre-sintering, the distance between the two holes can be detected.
  • two grooves are introduced into the green body. For detecting the distance of the two grooves after pre-sintering measuring tools can be used, which are designed less filigree than measuring tools for detecting holes.
  • the introduction of bores in the green compact represents a particularly simple way of providing structural features on the green compact. In addition, such a large part of the surface of the green compact is kept free of design features. As a result, a body that will shrink differently in different directions during presintering and sintering may be processed to accommodate different degrees of shrinkage in different directions. The edits of the white product can thus be adapted very precisely to the shrinkage.
  • Different shrinkage in different directions may be due, for example, to the shape or manufacture of the body.
  • the processing of the white compact can be adapted to a different degree of shrinkage in different spatial directions.
  • a plurality of design features are introduced into the green compact, these are detected after the pre-sintering, and an average value for the expected shrinkage is determined from the detected values. This takes into account a different shrinkage in different areas of the body. In addition, the machining data are easily adapted to the different shrinkages. All processing dimensions for processing the white product are determined with the same magnification factor.
  • the arithmetic mean is formed.
  • the detected values are added and divided by the number of detected values.
  • weighted arithmetic mean will be the individual values recorded are weighted by frequency and importance.
  • the shape feature is a recess.
  • the design feature can be easily introduced by machining in the green compact.
  • the green compact consists of ceramic material, in particular zirconium oxide and / or aluminum oxide.
  • the white body is intended for further processing into a component which can be used in the medical field, in particular in the dental field.
  • the average green density was 3.000 g / cm 3
  • the maximum scattering of the green density was +/- 0.015 g / cm 3
  • the standard deviation was less than 0.005 g / cm 3.
  • the density of the individual green compacts was determined by weighing and measuring the edge lengths of the cuboid green compacts.
  • this batch was pre-sintered to white.
  • the whitewashes are processed and then densely sintered.
  • the density of the whitewashes was 3,050 g / cm 3
  • the standard deviation of the density was 0.2 g / cm 3 .
  • the batch was finish sintered into densely sintered components.
  • the average density of the densely sintered members was 6,060 g / cm 3 .
  • the densities of the bodies were between 6.050 g / cm 3 and 6.070 g / cm 3, the standard deviation was less than 0.003 g / cm 3.
  • Fig. 1 is a schematic representation of a method according to the invention
  • Fig. 2 is a schematic representation of another method according to the invention.
  • Fig. 3 is a perspective view of a white body according to the invention in a first embodiment
  • Fig. 4 is a perspective view of another
  • Embodiment of a white body according to the invention Embodiment of a white body according to the invention.
  • FIG. 1 shows a schematic representation of a method according to the invention.
  • Production step is made by pressing from a granulate a green compact with a defined density.
  • the green body has a projection as a design feature. The position or the length or thickness of the projection is controlled with a micrometer.
  • the green compact of known density is pre-sintered to a white body.
  • the position or the length or Thickness of the projection is thus characterized by the design feature.
  • the white body is then clamped in a CAD-CAM processing machine.
  • a sensor in the CAD-CAM processing machine detects the position or the length or thickness of the projection.
  • the expected sintering shrinkage during sintering is determined to a sintered body of defined density. This is done on the basis of the correlation of the geometry changes of the projection to the density change of the body and on the basis of the expected overall shrinkage by pre-sintering and sintering. Due to the expected sintering shrinkage, a magnification factor is calculated for the processing of the white product.
  • the green body in the CAD-CAM processing machine is converted to an enlarged white, e.g. a bridge framework, milled.
  • the white body is fired to a sintered body or a dense ceramic or the bridge framework. Subsequently, the bridge framework is blinded.
  • the veneer is applied and burned like enamel. The veneer imitates the color of the patient's individual tooth. In addition, the properties of the veneer are more like natural enamel, thus avoiding excessive wear of the opposing natural tooth.
  • the homogeneity of the blanks used and the exact knowledge of the sintering shrinkage of the blank is crucial.
  • the homogeneity of the blanks becomes ensured by great care of the producers.
  • the indication of the sintering shrinkage is achieved by providing the green bodies with design features that change by pre-sintering.
  • the pre-sintering determines the shrinkage or shrinkage values from the white body to the sintered body or CAD-CAM block and from the mechanically processed white body or from the milling and / or grinding work to the sintered body or sintered framework.
  • the pre-interval is characterized by the structural features introduced into the green body. Due to the fact that a processing machine can determine the pre-interval on the basis of the design features, there is no need to provide the blank with a magnification factor.
  • FIG. 2 shows a schematic representation of a further method according to the invention.
  • the thickness of the projection is measured in a sample of green compacts with a micrometer and determines the average thickness.
  • the density of individual green compacts is determined in a random sample by measuring the volume and the weight. Then the mean density of this sample is determined.
  • a sample of the green compacts is finally sintered to the white body and then to the densely sintered component or sintered body.
  • the thickness of the projection is measured in this sample and the average thickness determined.
  • the density of the individual components of the sample is determined and the average density determined.
  • the green compacts are pre-sintered to white.
  • the thickness of the protrusion changes.
  • the pre-interval of the white product is thus characterized by the thickness of the projection.
  • the white body is then clamped in a CAD-CAM processing machine.
  • a sensor in the CAD-CAM processing machine detects the thickness of the projection. From the thickness of the projection on the respective white, the mean thickness of the projection in the sample of green bodies and the sintered components, the average density of the green compacts and the average density of the densely sintered components, the expected sintering shrinkage during the final sintering process becomes the densely sintered component intended for each individual Weissling. As in the method shown in FIG. 1, the enlargement factor is determined on the basis of the expected sintering shrinkage, and the white body is further processed accordingly.
  • a machining is preferably the attachment of a holder or the attachment of features.
  • Shrinkage 12000 measurements are performed. Of these 9000 measurements for the dimensions and 3000 measurements for the respective weight.
  • FIG. 3 shows a perspective view of a white body 1 according to the invention in a first embodiment.
  • the white 1 is cylindrical.
  • As a design features two circumferential grooves 2 have been rotated in the white 1.
  • the two grooves 2 are arranged adjacent to the circular surfaces 3 of the cylinder.
  • This white body 1 is milled and / or ground in a CAD-CAM machine into an enlarged crown framework.
  • the shrinkage during presintering and from this the expected shrinkage during sintering is calculated.
  • the grooves 2 are made equal in all white bodies 1 of this embodiment, so that the distance before pre-sintering is always the same. The distance measure before pre-sintering can therefore be entered firmly into the machine. From the distance measurements before and after the pre-sintering, the linear change in length and therefrom the magnification factor for the processing of the white body is calculated.
  • the shrinkage of the white compact 1 is considered in a relatively large area and averaged.
  • the expected shrinkage during sintering can be determined with high accuracy.
  • the distance between the two grooves 2 e.g. from a CAD-CAM machine, which also performs the processing of the blank, be measured in many different places. The average value can then be formed from the individual measurement results so that measurement inaccuracies can be compensated.
  • FIG. 4 shows a perspective view of a further embodiment of a white body 4 according to the invention.
  • the white body 4 according to the invention is designed here as a block-shaped block 4. On one side of the block 4 are as
  • the expected sintering shrinkage is calculated.
  • the distance between the recesses 5, 6, 7 is measured by the user and processor of the white product in a separate machine and from the comparison of this measured value with the distance known to the machine, the recesses 5, 6, 7 had before pre-sintering, the Pre-interval determined. From the pre-interval, the expected sintering shrinkage is calculated.
  • an inlay is present, which is particularly dimensionally stable in all areas.
  • the shape features are additionally used here to identify the block.
  • the design features tell the machine what size the block has and what material it is made of.
  • the design features represent reference points. These reference points are recognized by the sensor of the machine. This is especially useful if the block has to be re-clamped during processing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dentistry (AREA)
  • Veterinary Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Composite Materials (AREA)
  • Inorganic Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un procédé pour déterminer le retrait de frittage d'un corps préfritté. Ce procédé consiste à préparer une ébauche crue présentant au moins une caractéristique de forme, à préfitter cette ébauche crue pour obtenir une ébauche blanche, à déterminer une modification de la caractéristique de forme lors du préfrittage, puis à déterminer le retrait de frittage prévisible d'après la modification déterminée.
EP07819599A 2006-11-03 2007-11-05 Procédé pour déterminer le retrait de frittage d'un corps préfritté Withdrawn EP2091462A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006052027A DE102006052027B4 (de) 2006-11-03 2006-11-03 Verfahren zum Bestimmen des Sinterschwunds eines vorgesinterten Körpers und Bearbeitungsmaschine zur Bearbeitung von Weißlingen
PCT/EP2007/009578 WO2008052807A2 (fr) 2006-11-03 2007-11-05 Procédé pour déterminer le retrait de frittage d'un corps préfritté

Publications (1)

Publication Number Publication Date
EP2091462A2 true EP2091462A2 (fr) 2009-08-26

Family

ID=39048832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07819599A Withdrawn EP2091462A2 (fr) 2006-11-03 2007-11-05 Procédé pour déterminer le retrait de frittage d'un corps préfritté

Country Status (5)

Country Link
US (1) US8366978B2 (fr)
EP (1) EP2091462A2 (fr)
BR (1) BRPI0718122A2 (fr)
DE (1) DE102006052027B4 (fr)
WO (1) WO2008052807A2 (fr)

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DE10322762B4 (de) 2003-05-19 2013-12-05 Sirona Dental Systems Gmbh Halter für einen Rohling und Verfahren zur Vermessung der Lage und Orientierung des Halters
DE10330758B4 (de) 2003-07-07 2006-07-20 Sirona Dental Systems Gmbh Rohling zur Herstellung zahntechnischer Formteile und Verfahren zur Herstellung des Formteils
DE102004063417B4 (de) 2004-12-23 2006-08-24 Sirona Dental Systems Gmbh Rohling zur Herstellung zahntechnischer Formteile und Verfahren zur Herstellung des Formteils
DE102008020720A1 (de) 2008-04-03 2009-10-15 Sirona Dental Systems Gmbh & Co. Kg Verfahren zur Bearbeitung eines Rohlings mit einem individuellen Vergrößerungsfaktor und Rohling hierfür
US9878958B2 (en) * 2012-02-29 2018-01-30 Corning Incorporated Dimensional control of ceramic structures via composition
FR2994967B1 (fr) * 2012-09-06 2021-10-08 Jaune De Chrome Procede et dispositif de realisation d'une piece en ceramique, notamment en porcelaine
US10643778B1 (en) 2014-09-09 2020-05-05 Universal Lighting Technologies, Inc. Magnetic core structure and manufacturing method using a grinding post
DE102014117109A1 (de) * 2014-11-21 2016-05-25 Merz Dental Gmbh Verfahren zur Lagepositionierung eines Halbzeuges, Verfahren zur Herstellung eines Halbzeuges zur reproduzierbaren Lagepositionierung sowie ein geeignetes Halbzeug und eine entsprechende Verwendung hierfür
US20170360535A1 (en) * 2014-12-22 2017-12-21 Dental Wings Inc. Pre-forms and methods for using same in the manufacture of dental prostheses

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WO2008052807A2 (fr) 2008-05-08
WO2008052807A3 (fr) 2008-09-18
DE102006052027A1 (de) 2008-05-08
US8366978B2 (en) 2013-02-05
BRPI0718122A2 (pt) 2013-11-26
US20090273108A1 (en) 2009-11-05
DE102006052027B4 (de) 2009-06-25

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