Patent US5342201A successfully refreshed from Google Patents.
US5342201A
Expired / Lapsed
US
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Method of manufacturing ceramic artifical tooth restorations
Assignee: Nobel Biocare Services AG
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Filing: 1993-06-22
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Granted: 1994-08-30
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Expires: 2013-06-22
Abstract
Abstract There is disclosed a method of manufacturing artificial tooth restorations for natural teeth or implants comprising a ceramic densely sintered, high-strength individual core B with dental porcelain A by powder metallurgical manufacturing methods. The inner surface I of the core B, which will fit against one or more prepared tooth surfaces P or artificial abutments, is manufactured by forming a ceramic powder mixture against a surface of a body at which this mentioned surface is manufactured by registering the surfaces of the prepared teeth or artificial abutments and their mutual relationship with a three-dimensional optical or mechanical reading method directly in the mouth or on a model of, e.g., plaster, after which the registered surfaces are reproduced in an enlarged size, e.g., with a computer-controlled milling machine. The amount of enlargement is calculated from the shrinkage of the ceramic material during sintering to full density and considering the gap for cement.
Inventors
- 👤 Agneta Oden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:32
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/20; A61C13/0003; A61C13/0004; A61C5/00; A61C5/20; A61K; A61K6/00; A61K6/80; A61K6/802; A61K6/818; A61C13/08; A61C13/083; A61C13/09
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
154 words
A method for making artificial tooth restorations comprising a ceramic and comprising a densely sintered, high-strength core and dental porcelain atop the core comprising: (a) registering the surfaces of a tooth to be restored or artificial abutments and their mutual relationship with a three-dimensional optical or mechanical reading method directly in the mouth or a model thereof; (b) reproducing the registered surfaces in a body by a computer-controlled milling machine at a size enlarged to compensate for shrinkage of the ceramic material to be used for the artificial tooth restoration during sintering and for any gap required for cement; (c) forming a ceramic powder mixture against the reproduced surfaces to form artificial tooth restoration precursors having inner surfaces which will fit against the said surfaces of a tooth to be restored or artificial abutments; (d) sintering the said artificial tooth restorations; and (e) applying a dental porcelain to the outer surface of the core.
Claim 2
Independent Claim
154 words
A method for making artificial tooth restorations comprising a ceramic and comprising a densely sintered, high-strength core and dental porcelain atop the core comprising: (a) registering the surfaces of a tooth to be restored or artificial abutments and their mutual relationship with a three-dimensional optical or mechanical reading method directly in the mouth or a model thereof; (b) reproducing the registered surfaces in a body by a computer-controlled milling machine at a size enlarged to compensate for shrinkage of the ceramic material to be used for the artificial tooth restoration during sintering and for any gap required for cement; (c) forming a ceramic powder mixture against the reproduced surfaces to form artificial tooth restoration precursors having inner surfaces which will fit against the said surfaces of a tooth to be restored or artificial abutments; (d) sintering the said artificial tooth restorations; and (e) applying a dental porcelain to the outer surface of the core.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein the outer surface of the core is dry pressed close to desired size against the enlarged reproductions using an impression in some viscous elastic material.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein the core is made by a dry pressing against a plaster model of the enlarged reproductions, after which the core is presintered on the plaster model.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein the core is manufactured by slip casting against a plaster model of the enlarged reproductions, after which the core is presintered on the plaster model.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the ceramic material of the core has a relative density of>99%.
Claim 7
Dependent Claim
46 words
The method of claim 5 wherein the ceramic material of the core is based on one more of the oxides Al 2 O 3 , TiO 2 , MgO, ZrO 2 or ZrO 2 with up to 25 mole % Y 2 O 3 or MgO.
Claim 8
Dependent Claim
21 words
The method of claim 5 wherein the core material also comprises whiskers and/or particles of SiC, TiN, ZrO 2 and/or ZrN.
Claim 9
Independent Claim
136 words
A method for making artificial tooth restorations comprising a ceramic and comprising a densely sintered, high-strength core comprising; (a) registering the surfaces of a tooth to be restored or artificial abutments and their mutual relationship with a three-dimensional optical or mechanical reading method directly in the mouth or a model thereof; (b) reproducing the registered surfaces in a body by a computer-controlled milling machine at a size enlarged to compensate for shrinkage of the ceramic material to be used for the artificial tooth restoration during sintering and for any gap required for cement; (c) forming a ceramic powder mixture against the reproduced surfaces to form artificial tooth restoration precursors having inner surfaces which will fit against the said surfaces of a tooth to be restored or artificial abutments; and (d) sintering the said artificial tooth restorations.
Claim 10
Independent Claim
136 words
A method for making artificial tooth restorations comprising a ceramic and comprising a densely sintered, high-strength core comprising; (a) registering the surfaces of a tooth to be restored or artificial abutments and their mutual relationship with a three-dimensional optical or mechanical reading method directly in the mouth or a model thereof; (b) reproducing the registered surfaces in a body by a computer-controlled milling machine at a size enlarged to compensate for shrinkage of the ceramic material to be used for the artificial tooth restoration during sintering and for any gap required for cement; (c) forming a ceramic powder mixture against the reproduced surfaces to form artificial tooth restoration precursors having inner surfaces which will fit against the said surfaces of a tooth to be restored or artificial abutments; and (d) sintering the said artificial tooth restorations.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-08-29 | 1998-02-28 | 1998-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-29 | 2002-02-28 | 2002-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-29 | 2006-02-28 | 2006-08-30 | $7700.00 | Window Closed / Lapsed |