Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS20040245664 A1
Publication typeApplication
Application numberUS 10/693,731
Publication date9 Dec 2004
Filing date24 Oct 2003
Priority date21 Jul 2000
Also published asUS6689202, US7943068, US20020017021, US20070056467, WO2002007680A2, WO2002007680A3
Publication number10693731, 693731, US 2004/0245664 A1, US 2004/245664 A1, US 20040245664 A1, US 20040245664A1, US 2004245664 A1, US 2004245664A1, US-A1-20040245664, US-A1-2004245664, US2004/0245664A1, US2004/245664A1, US20040245664 A1, US20040245664A1, US2004245664 A1, US2004245664A1
InventorsCarlino Panzera
Original AssigneeCarlino Panzera
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of making a dental restoration
US 20040245664 A1
Abstract
A method for making a dental restoration by milling a dental model from a partially sintered ceramic material, applying dental material thereon, and curing the dental material on the model to obtain a dental restoration. The method can be used for forming a variety of dental restorations including, but not limited to, crowns, bridges, space maintainers, tooth replacement appliances, orthodontic retainers, dentures, posts, jackets, inlays, onlays, facings, veneers, facets, implants, abutments, splints, partial crowns, teeth, cylinders, pins, and connectors.
Images(5)
Previous page
Next page
Claims(43)
What is claimed is:
1. A blank for the manufacture of a dental model fabricated from a partially sintered ceramic material.
2. The blank of claim 1 wherein the partially sintered material comprises alumina, zirconia, magnesia, zircon, aluminosilicate, cordierite, mica, quartz, cristobolite, silica, leucite, silicon nitride, silicon carbide, silica-alumina-nitrides, mullite, garnet, or mixtures thereof.
3. The blank of claim 1 wherein the partially sintered ceramic material is derived from a mixture comprising a refractory ceramic material and a binder.
4. The blank of claim 3 wherein the refractory ceramic material comprises alumina, zirconia, magnesia, zircon, aluminosilicate, cordierite, mica, quartz, cristobolite, silica, leucite, silicon nitride, silicon carbide, silica-alumina-nitrides, mullite, garnet, or mixtures thereof.
5. The blank of claim 3 wherein the binder comprises an inorganic material, an organic material, or mixtures thereof.
6. The blank of claim 5 wherein the organic material comprises polyvinyl pyrrolidine, polyvinyl alcohol, polyvinyl acetate, polyvinyl chloride, polyvinyl butryal and polystyrene, or mixtures thereof.
7. The blank of claim 5 wherein the inorganic material comprises magnesium oxide, ammonium phosphate, colloidal sillica, calcium sulfate, magnesium phosphate, alkaline silicates, silica hydrosol, colloidal clays, or mixtures thereof.
8. The blank of claim 1 wherein the partially sintered ceramic material is sintered to less than about 92% of theoretical full density.
9. The blank of claim 1 wherein the partially sintered ceramic material is sintered to less than about 80% of theoretical full density.
10. The blank of claim 1 wherein the partially sintered ceramic material is sintered to less than about 75% of theoretical full density.
11. The blank of claim 1 having a flexural strength in the range from about 1 to about 75 MPa.
12. The blank of claim 1 having a flexural strength in the range from about 3 to about 20 MPa.
13. The blank of claim 1 wherein the partially sintered ceramic material comprises a refractory investment material.
14. The blank of claim 1 wherein the partially sintered ceramic material comprises a castable investment material.
15. The blank of claim 1 wherein the dental model it is used for the manufacture of a dental restoration.
16. The blank of claim 15 wherein the dental restoration is selected from the group consisting of crowns, bridges, space maintainers, tooth replacement appliances, orthodontic retainers, dentures, posts, jackets, inlays, onlays, facings, veneers , facets, implants, abutments, splints, partial crowns, teeth, cylinders, pins, and connectors.
17. A method for making a dental restoration comprising:
milling a dental model from a partially sintered ceramic material;
applying dental material thereon; and
curing the dental material on the model to obtain a dental restoration.
18. The method of claim 17 wherein the curing process comprises sintering, light curing, or heat curing.
19. The method of claim 17 wherein the dental material comprises a metal material, a ceramic material, a composite material or mixtures thereof.
20. The method of claim 19 wherein the metal material comprises a single metal or an alloy of two or more metals.
21. The method of claim 19 wherein the metal material comprises metal powder in combination with a binder.
22. The method of claim 21 wherein the metal powder in combination with the binder is in the form a sheet.
23. The method of claim 19 wherein the metal material is in the form of a foil.
24. The method of claim 19 wherein the ceramic material comprises porcelain.
25. The method of claim 19 wherein the ceramic comprises a high-strength material.
26. The method of claim 19 wherein the composite material comprises a material selected from a particulate-reinforced polymeric material, a fiber-reinforced polymeric material and mixtures thereof.
27. The method of claim 17 wherein one or more layers of material are applied on the dental restoration.
28. The method of claim 27 wherein the one or more layers of material comprises a material selected from the group consisting of a porcelain or composite material.
29. A method for making a dental restoration comprising:
obtaining data of a patient's tooth;
milling a dental model from a partially sintered ceramic material based on the data obtained from the patient's tooth.
30. The method of claim 29 wherein the data obtained from the patient's tooth is acquired by photographing the patient's tooth.
31. The method of claim 29 wherein the data obtained from the patient's tooth is acquired by scanning the patient's tooth.
32. The method of claim 29 further comprising:
applying dental material onto the model; and
heating the model and dental material thereon to obtain a dental restoration.
33. A method of making a blank for the manufacture of dental model comprising: forming a mixture comprising a refractory material and a binder into a shape; and partially sintering the formed shape.
34. The method of claim 33 wherein the refractory material comprises one or more materials selected from the group consisting of alumina, zirconia, magnesia, zircon, aluminosilicate, cordierite, mica, quartz, cristobolite, silica, silicon nitride, silicon carbide, leucite, silica-alumina-nitrides, mullite, garnet, or mixtures thereof.
35. The method of claim 33 wherein the binder comprises an inorganic material, an organic material, or mixtures thereof.
36. The method of claim 33 wherein the organic material comprises polyvinyl pyrrolidine, polyvinyl alcohol, polyvinyl acetate, polyvinyl chloride, polyvinyl butryal and polystyrene, or mixtures thereof.
37. The method of claim 33 wherein the inorganic material comprises magnesium oxide, ammonium phosphate, colloidal silica, calcium sulfate, magnesium phosphate, alkaline silicates, silica hydrosol, colloidal clays, and mixtures thereof.
38. The method of claim 33 wherein the partially sintering step is conducted at a temperature to provide a partially sintered ceramic material having a density less than about 92% theoretical full density.
39. The method of claim 33 wherein the partially sintering step is conducted for a time to provide a partially sintered ceramic material having a density less than about 92% theoretical full density.
40. The method of claim 33 wherein the partially sintering step is conducted at a temperature to provide a partially sintered ceramic material having a density less than about 80% theoretical full density.
41. The method of claim 33 wherein the partially sintering step is conducted for a time to provide a partially sintered ceramic material having a density less than about 80% theoretical full density.
42. The method of claim 33 wherein the partially sintering step is conducted at a temperature to provide a partially sintered ceramic material having a density less than about 75% theoretical full density.
43. The method of claim 33 wherein the partially sintering step is conducted for a time to provide a partially sintered ceramic material having a density less than about 75% theoretical full density.
Description
    CROSS-REFERENCE TO RELATED APPLICATIONS
  • [0001]
    This is application claims priority to U.S. Provisional Application No. 60/219,893 filed Jul. 21, 2000 which is incorporated herein by reference.
  • FIELD OF THE INVENTION
  • [0002]
    The present invention relates generally to molds for and methods of manufacturing dental restorations and more specifically to molds for and methods of manufacturing dental restorations using CAD/CAM methods.
  • BACKGROUND OF THE INVENTION
  • [0003]
    In the manufacture of dental restorations, the dental practitioner prepares the tooth to be restored by grinding the subject tooth or teeth down to form one or more tooth preparations to which the prosthetic device is to be attached. An impression of the tooth preparation is taken in an elastic material and the impression is used to produce a model with dies. The model or die is then used to prepare the restoration thereon such as by casting or pressing a material onto the die.
  • [0004]
    U.S. Pat. No. 4,937,928, which is hereby incorporated by reference, is directed to a method of making a dental restoration wherein a model of a dental preparation is made by milling a refractory material under the control of a CAD/CAM system. The refractory material is a high strength material such as magnesia, which is needed to withstand the high temperatures used to process the dental materials used therein, e.g., palladium which has a melting temperature of 1552° C. Due to the high strength of the refractory material, it may be difficult to mill the material into the desired shape. Moreover, the milling tools become quickly worn and must be replaced frequently leading to high costs of production. Furthermore, magnesia is known to be unstable. It is hydroscopic and tends to absorb and react easily with moisture. Depending upon the high reactivity of magnesia, there is no guarantee that it will sinter consistently every time. The dimensions may change during sintering, resulting in a restoration which does not fit the tooth properly.
  • [0005]
    There is a need to provide a softer material for producing models and dies for the manufacture of dental restorations. It is desirable that the soft material be stable and exhibit good thermal properties. It is beneficial that the soft material be strong to withstand high temperature and pressing operations.
  • SUMMARY OF THE INVENTION
  • [0006]
    These and other objects and advantages are accomplished by blocks or blanks of material prepared in a variety of shapes and sizes to be used in the fabrication of models for dental restorations. The blanks may be provided in a variety of shapes including but not limited to square, circular, rectangular, cylindrical and triangular shapes. The material comprises a partially sintered ceramic material. The blanks are used to manufacture molds using CAD/CAM methods and equipment. The molds are useful in the manufacture of dental restorations using ceramics, metals, alloys, or powders thereof, and composite materials. The models milled from the blanks may be used to manufacture a variety of dental restorations including, but not limited to, crowns, bridges, space maintainers, tooth replacement appliances, orthodontic retainers, dentures, posts, jackets, inlays, onlays, facings, veneers, facets, implants, abutments, splints, partial crowns, teeth, cylinders, pins, and connectors.
  • DETAILED DESCRIPTION OF THE INVENTION
  • [0007]
    As will be appreciated, the present invention provides materials and methods of manufacturing dental restorations using blocks or blanks of material prepared in a variety of shapes and sizes to be used in the fabrication of dental restorations. The material may comprise any partially sintered ceramic material, i.e., a partially sintered material is a material that is not sintered to full density, making it easy to machine. Useful partially sintered ceramic materials are refractory, not reactive, and essentially inert during subsequent firing steps. Sinterable refractory ceramic materials thus include but are not limited to quartz, cristobalite, other forms of silica, leucite, various forms of zirconia, hafnia, zircon, alumina, magnesia, zircon, aluminosilicate, cordierite, mica, silicon nitride, silicon carbide, silica-alumina-nitrides, mullite, various garnets, or mixtures thereof.
  • [0008]
    It is often useful to formulate the refractory ceramic materials with a binder, which may be either organic or inorganic. Organic binders are well known, for example, polyvinyl pyrrolidine, polyvinyl alcohol, polyvinyl acetate, polyvinyl chloride, polyvinyl butryal and polystyrene, and mixtures thereof. Inorganic binders are known and may include but are not limited to magnesium oxide, ammonium phosphate, colloidal silica, calcium sulfate (gypsum), ethyl silicate, silica, magnesium phosphate, silica compounds such as alkaline silicates and silica hydrosol, colloidal clays, and mixtures thereof.
  • [0009]
    In general, such ceramics when partially sintered as used herein are sintered to less than about 92%, more preferably less than about 80%, even more preferably less than about 75%.
  • [0010]
    Castable refractory materials and investment refractory materials are particularly useful in the formation of partially sintered ceramic materials. Investment refractory materials useful herein include gypsum-bonded, phosphate-bonded and ethyl silicate-bonded investment materials. These investment materials normally contain up to about 80% of a refractory material such as quartz, cristobolite, other forms of silica, leucite, various forms of zirconia, hafnia, zircon, etc. or mixtures thereof. These investment materials are commercially available and are widely used in dental laboratories for various purposes, one such purpose being for creation of a mold space during the “lost wax process.” Examples of commercially available investment materials include RapidVest® investment available from Jeneric®/Pentron® Inc., Wallingford, Conn.; Accu-Press™ investment available from Talladium Inc., Valencia, Calif.; PC15™ investment available from WhipMix Corporation, Louisville, Ky.; and Speed™ investment available from Ivoclar North America, Amherst, N.Y. Examples of castable refractory materials include Ceramacast™ brand castable refractory materials from Aremco Products Inc. (Ossining, N.Y.). Ceramacast™ castables comprise a mixture of a filler and a bonding agent whereby the filler is based on alumina, zirconia, magnesia, zircon, aluminosilicate, cordierite, mica, and mixtures thereof.
  • [0011]
    The blanks may be fabricated by known casting methods. Such methods will, of course, depend on the particular ceramic material and optional binder, and are well-known to one of ordinary skill in the art or may be determined through routine experimentation. The methods and materials for mass production of the blanks herein described include but are not limited to mass-production processes such as casting, slip-casting, extrusion and dry-pressing.
  • [0012]
    The partially sintered ceramic material used to make the blanks exhibits a flexural strength in the range from about 1 to about 75 MPa and preferably in the range from about 3 to about 20 MPa.
  • [0013]
    It is important that the thermal expansion of the mold and the thermal expansion of the material applied to the mold be compatible to prevent weakening or cracking of the dental restoration. It is preferable that the mold have a thermal expansion that is lower than the thermal expansion of the material applied thereto (ceramic, metal, alloy, composite), although depending upon the materials used, the thermal expansion of the material applied may be lower than that of the mold. It should be mentioned that the materials used to fabricate the mold are stable and fire consistently so that there is little or no chance that the dimensions of the mold will change during the subsequent firing steps.
  • [0014]
    The blanks are used to manufacture molds using CAD/CAM methods and equipment. The process may include the steps of obtaining data regarding the patient's tooth or teeth to be restored in order to machine or mill a mold which replicates the tooth or teeth to be restored. This may be performed by known processes such as by photographing the patient's tooth or scanning the patient's tooth, such as by a digital or optical device. Alternatively, conventional methods may be used whereby an impression is taken of the patient's mouth and data is obtained from the impression or from the mold made from the impression. The data received is used to mill a mold from the soft-sintered ceramic material. Examples of CAD/CAM methods and equipment are described in U.S. Pat. Nos. 4,937,928, 5,910,273, 4,575,805, and 4,663,720 and are hereby incorporated by reference. Examples of commercially available CAD/CAM systems include the Cerec™ system available from Sirona™ USA, Charlotte, N.C., and the Pro 50™ system available from Cynovad™, Quebec City, Canada.
  • [0015]
    The molds or dies obtained are used in manufacturing dental restorations such as those described in U.S. Pat. Nos. 4,689,197, 4,828,495, 4,980,124, 3,502,466, 4,369,068, 5,653,791, and 5,944,884 and copending, commonly owned U.S. patent application Ser. No. 09/757,916, filed Jan. 10, 2001, copending, commonly owned U.S. patent application Ser. No. 09/653,377, filed Sep. 1, 2000, which are all hereby incorporated by reference. The molds are useful in the manufacture of dental restorations using ceramics, metals, alloys, or powders thereof, and composite materials.
  • [0016]
    Ceramic materials include high strength ceramic materials such as alumina, zirconia, silicon nitride, silicon carbide, silica-alumina-nitrides, mullite, various garnets etc. and porcelain materials such as commercially available OPC® 3G™ porcelain and OPC® porcelain, both available from Jeneric/Pentron Inc., Wallingford, Conn., and commercially available Empress™ porcelain and Empress II™ porcelain, both available from Ivoclar North America, Amherst, N.Y.
  • [0017]
    Processes used in the manufacture of ceramic dental restorations are well known; for example, pressing ceramic materials onto a mold into a space formed by the lost wax process. Such methods are set forth in U.S. Pat. Nos. 5,968,856, 5,507,981, copending, commonly owned U.S. patent application Ser. No. 09/458,919, filed Dec. 10, 1999, and copending, commonly owned U.S. patent application Ser. No. 09/640,941, filed Aug. 17, 2000, which are all hereby incorporated by reference.
  • [0018]
    Metals or alloys in the form of foils or in the form of powders in combination with a binder, such as wax, may be used in the form of a paste, tape or a sheet. Examples of such materials include commercially available Captek® materials available from Precious Chemicals Inc., Longwood, Fla., and SinterKor™ materials, available from Jeneric/Pentron Inc., Wallingford, Conn., and also as disclosed in the SinterKor™ Instruction Manual from Jeneric/Pentron, Revision 3.1, July 2000, which is hereby incorporated by reference for all materials and processes therein. Moreover U.S. patent application Ser. No. 09/757,916, describes methods of manufacture using the aforementioned materials and is hereby incorporated by reference. Accordingly, the paste may be pressed onto and around the die or the sheet or foil may be cut to a desired shape to fit onto the die. The process is continued as described and known to form the desired dental restoration.
  • [0019]
    Composite materials may include those materials such as those set forth in U.S. Pat. Nos. 4,717,341 and 4,894,012 to Goldberg, U.S. Pat. No. 6,200,136 to Prasad, and U.S. Pat. No. 6,186,790 to Karmaker, all of which are incorporated by reference herein. The composite material may be any known composite material such as a resin or polymeric material combined with particulate and/or fiber material or mixtures thereof. Preferably, the composite is a polymeric material having particulate therein such as commercially available Sculpture® composite available from Jeneric/Pentron Inc., Wallingford, Conn., or polymeric material reinforced with fiber and/or particulate such as commercially available FibreKor® composite from Jeneric/Pentron, Inc., Wallingford, Conn.
  • [0020]
    One or more layers of material may be further applied to the dental restoration to finish the restoration. Such layers may be fabricated of a porcelain or composite material.
  • [0021]
    The models milled from the blanks may used to manufacture a variety of dental restorations including, but not limited to, crowns, bridges, space maintainers, tooth replacement appliances, orthodontic retainers, dentures, posts, jackets, inlays, onlays, facings, veneers, facets, implants, abutments, splints, partial crowns, teeth, cylinders, pins, and connectors.
  • [0022]
    The invention facilitates and eases the manufacture of dental restorations by providing millable, soft blanks of material that can be easily machined into models or dies.
  • [0023]
    The following examples illustrate the present invention.
  • EXAMPLE 1
  • [0024]
    A mixture of quartz powder, magnesium oxide and ammonium phosphate was made into a blank by mixing it with 25% by wt. colloidal silica (40% by wt. concentration) and pouring it into molds. The mixture was allowed to cure for about 15 minutes and sintered to about 1000° C. for 1 hour to effect a “soft sintered” state. The cylinder had dimensions of about 0.5 inches in diameter and about 0.7 inches high. The resultant cylinder was held together, but was not too strong such that it could be easily machined into a tooth shape. The cylinder was machined into a mold and a sheet of Sinterkor™ material was cut and applied onto the mold and thereafter sintered at 1000° C. using Sinterkor™ techniques and processing parameters. The resulting Sinterkor™ restoration was removed from the mold. The mold was inspected and showed no changes or deformation in shape from the originally molded shape.
  • EXAMPLE 2
  • [0025]
    A mixture of leucite powder, magnesia and ammonium phosphate was mixed with 25% by wt. colloidal silica (40% by wt concentration) poured into molds, allowed to cure for about 15 minutes and sintered to 1000° C. for one hour to effect a “soft sintered” state. The cylinder had dimensions of about 0.5 inches in diameter and about 0.7 inches high. The resultant cylinder was held together, but was not too strong such that it could be easily machined into a tooth shape. The cylinder was milled into a mold and the mold was used to manufacture a dental crown using OPC® porcelain material. The mold was invested using the lost wax process and a pellet of OPC® porcelain material was pressed onto the mold to form the dental restoration at approximately 910° C. The mold was inspected and showed no changes or deformation in shape from the originally molded shape.
  • EXAMPLE 3
  • [0026]
    A mixture of zirconia (stabilized with 4 mole % CaO) 20% by wt. quartz and 3% by wt. of Duramax™ binder, available from Rohm Hass, Philadelphia, Pa., was cold pressed in a steel die, and sintered in air to 1100° C. for one hour to effect a “soft sintered” state. The blank measured 0.5 inches in diameter by 0.75 inches high. The blank was machined into a mold and a sheet of Sinterkor™ material was cut and applied onto the mold and thereafter sintered at 1000° C. using Sinterkor™ techniques and processing parameters. The resultant Sinterkor™ restoration was removed from the mold. The mold was inspected and showed no changes or deformation in shape from the originally molded shape.
  • [0027]
    While various descriptions of the present invention are described above, it should be understood that the various features can be used singly or in any combination thereof. Therefore, this invention is not to be limited to only the specifically preferred embodiments depicted herein.
  • [0028]
    Further, it should be understood that variations and modifications within the spirit and scope of the invention may occur to those skilled in the art to which the invention pertains. Accordingly, all expedient modifications readily attainable by one versed in the art from the disclosure set forth herein that are within the scope and spirit of the present invention are to be included as further embodiments of the present invention. The scope of the present invention is accordingly defined as set forth in the appended claims.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3502466 *9 Feb 196824 Mar 1970Ceramco Ind Products CorpManufacture of articles from powdered metals
US4369068 *10 Aug 198118 Jan 1983Degussa AktiengesellschaftGold containing preparation for coating metallic parts
US4575805 *23 Aug 198411 Mar 1986Moermann Werner HMethod and apparatus for the fabrication of custom-shaped implants
US4663720 *21 Nov 19845 May 1987Francois DuretMethod of and apparatus for making a prosthesis, especially a dental prosthesis
US4689197 *4 Apr 198625 Aug 1987Degussa AktiengesellschaftProcess for the production of a metallic denture
US4717341 *13 Jan 19865 Jan 1988Goldberg A JonOrthodontic appliance system
US4772436 *10 Apr 198720 Sep 1988Michele TyszblatProcess for the preparation of a dental prosthesis by slight solid phase fritting of a metal oxide based infrastructure
US4776704 *15 Dec 198611 Oct 1988Dentsply Research & Development Corp.Mixing and dispensing syringe
US4828495 *28 Oct 19869 May 1989Denpac Corp.Sintered alloy dental prosthetic devices and method
US4894012 *16 Nov 198716 Jan 1990The University Of ConnecticutPassive dental appliances of fiber-reinforced composites
US4937928 *5 Oct 19883 Jul 1990Elephant Edelmetaal B.V.Method of making a dental crown for a dental preparation by means of a CAD-CAM system
US4980124 *29 Jun 198925 Dec 1990Dimmer David CDental restoration and method for its production
US5062798 *26 Apr 19895 Nov 1991Ngk Spark Plug Co., Ltd.SiC based artificial dental implant
US5304239 *5 Apr 199119 Apr 1994Bayer AktiengesellschaftDental investment compounds in the form of a powder with improved flow properties
US5342201 *22 Jun 199330 Aug 1994Sandvik AbMethod of manufacturing ceramic artifical tooth restorations
US5378154 *31 Mar 19933 Jan 1995Elephant Holding B.V.Dental prosthesis and method for manufacturing a dental prosthesis
US5452219 *29 Mar 199419 Sep 1995Dentsply Research & Development Corp.Method of making a tooth mold
US5507981 *31 May 199416 Apr 1996Tel Ventures, Inc.Method for molding dental restorations
US5653791 *12 Mar 19965 Aug 1997Jeneric/Pentron, IncorporatedTwo-phase dental forcelain composition
US5775912 *16 Aug 19967 Jul 1998American Thermocraft CorporationMethod of producing a dental restoration using CAD/CAM
US5910273 *11 Oct 19958 Jun 1999Vita Zahnfabrik H. Rauter Gmbh & Co. KgProcess for manufacturing dental prosthetics based on ceramics
US5944884 *28 May 199831 Aug 1999Jeneric/Pentron IncorporatedDental porcelain composition
US5968856 *5 Sep 199719 Oct 1999Ivoclar AgSinterable lithium disilicate glass ceramic
US6028672 *30 Sep 199622 Feb 2000Zheng J. GengHigh speed three dimensional imaging method
US6186790 *12 Nov 199813 Feb 2001Jeneric/Pentron IncorporatedPrefabricated components for dental appliances
US6200136 *7 Aug 199813 Mar 2001Jeneric/Pentron IncorporatedFiber-reinforced dental bridge and method of manufacture thereof
US6455451 *10 Dec 199924 Sep 2002Jeneric/Pentron, Inc.Pressable lithium disilicate glass ceramics
US6517623 *17 Aug 200011 Feb 2003Jeneric/Pentron, Inc.Lithium disilicate glass ceramics
US6613273 *10 Jan 20012 Sep 2003Jeneric/Pentron IncorporatedMethod for the manufacture of dental restorations
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US78355583 Apr 200716 Nov 2010Tekno Replik Inc.Method and system for making dental restorations
US9629697 *22 Nov 201225 Apr 2017Invibio LimitedProsthodontic device
US20070243503 *3 Apr 200718 Oct 2007Jean GagnonMethod and system for making dental restorations
US20090081617 *20 Sep 200826 Mar 2009D4D Technologies, LlcDisplay interface target positioning tool
US20140343707 *22 Nov 201220 Nov 2014Invibio LimitedProsthodontic device
Classifications
U.S. Classification264/16, 264/494, 264/642, 264/678, 264/236
International ClassificationA61K6/06
Cooperative ClassificationY10T29/49567, A61K6/026, A61K6/0245, A61K6/024, A61K6/0017
European ClassificationA61K6/06
Legal Events
DateCodeEventDescription
3 Aug 2004ASAssignment
Owner name: PENTRON LABORATORY TECHNOLOGIES, LLC, CONNECTICUT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PANZERA, CARLINO;REEL/FRAME:015700/0926
Effective date: 20040719