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US5076789A
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Metal-porcelain dental restorations, dental veneers, dental bridges and metal foil for use therein and methods for making dental appliances
Assignee: Tanaka Dental Enterprises
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Filing: 1990-07-13
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Granted: 1991-12-31
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Expires: 2010-07-13
Abstract
Abstract A metal porcelain dental restoration for filling an edentulous region is provided. The dental restoration comprises a first layer of a thin metal foil which closely fits the contours of the two abutment teeth on either side of the edentulous region, a layer of ceramic on the first metal foil layer, a second layer of thin metal foil connected to the ceramic layer and extending at least across the joint from the abutment teeth to the edentulous region and a ceramic build-up to fill the edentulous region.
Inventors
- 👤 Asami Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:09
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A metal-porcelain dental restoration for filling an edentulous region comprising: (a) a first layer of a thin metal foil closely fitting the contours of the two abutment teeth on either side of the edentulous regions; (b) a layer of ceramic on said first metal foil layer; (c) a second layer of a thin metal foil connected to said ceramic layer, said second layer extending at least across the joint from said abutment teeth to said edentulous region; and (d) a ceramic build-up to fill said edentulous region.
Claim 2
Dependent Claim
87 words
A metal-porcelain dental restoration for filling an edentulous region comprising: (a) a first layer of a thin metal foil closely fitting the contours of the two abutment teeth on either side of the edentulous regions; (b) a layer of ceramic on said first metal foil layer; (c) a second layer of a thin metal foil connected to said ceramic layer, said second layer extending at least across the joint from said abutment teeth to said edentulous region; and (d) a ceramic build-up to fill said edentulous region.
Claim 3
Dependent Claim
69 words
The metal-porcelain dental restoration of claim 1 wherein said first metal foil layer comprises a metal foil comprising a three-component alloy consisting of a total of about 2-5 wt. % of a color-adjusting metal from the group consisting of platinum, palladium, and silver; a total of about 0.1-5 wt. % of a non-precious metal from the group consisting of indium, iron, zinc, aluminum, and copper; and the balance gold.
Claim 4
Dependent Claim
29 words
The metal-porcelain dental restoration of claim 2 wherein said first metal foil layer comprises a metal foil comprising about 3 wt. % platinum and about 0.25 wt. % indium.
Claim 5
Dependent Claim
69 words
The metal-porcelain dental restoration of claim 2 wherein said second metal foil layer comprises a metal foil comprising a three-component alloy consisting of a total of about 2-5 wt. % of a color-adjusting metal from the group consisting of platinum, palladium, and silver; a total of about 0.1-5 wt. % of a non-precious metal from the group consisting of indium, iron, zinc, aluminum and copper; and the balance gold.
Claim 6
Dependent Claim
34 words
The metal-porcelain dental restoration of claim 4 wherein both said first metal foil layer and said second foil layer comprise a metal foil comprising about 3 wt. % platinum and 0.25 wt. % indium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |