Patent US4980124A successfully refreshed from Google Patents.
US4980124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental restoration and method for its production
Assignee: Individual
•
Filing: 1989-06-29
•
Granted: 1990-12-25
•
Expires: 2009-06-29
Abstract
Abstract An improvement is provided in the so-called "Foil" system for producing jacketed porcelain dental crowns. One of the most significant improvements is the formation of a crush-resistant coping comprised of a die-conforming noble metal foil and a bonded sintered alloy. Extremely strong crowns are produced in a short order of time by applying the porcelain over such a coping.
Inventors
- 👤 David C. Dimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:13
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; A61C5/00; A61C5/70; A61C5/77; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A method for forming a dental restoration for a prepared tooth comprising: (i) conforming a dentally acceptable, malleable foil to the shape of a die of the prepared tooth (ii) applying effective, inchoate crush-resistant improving amounts of a dentally acceptable particulate alloy coating unto the external surface of said conforming foil (iii) heating said coated foil for a time and at a temperature sufficient to sinter said coating and foil into a crush-resistant, unitary coping, said coating being substantially uniform.
Claim 2
Independent Claim
80 words
A method for forming a dental restoration for a prepared tooth comprising: (i) conforming a dentally acceptable, malleable foil to the shape of a die of the prepared tooth (ii) applying effective, inchoate crush-resistant improving amounts of a dentally acceptable particulate alloy coating unto the external surface of said conforming foil (iii) heating said coated foil for a time and at a temperature sufficient to sinter said coating and foil into a crush-resistant, unitary coping, said coating being substantially uniform.
Claim 3
Dependent Claim
16 words
The method of claim 1 and further including (iv) coating a veneering material over said coping.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein said foil is a palladium foil
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein said alloy is a palladium based alloy.
Claim 6
Dependent Claim
37 words
The method of claim 2 wherein said step (i) further comprises: removing said die from said conforming foil; and providing the internal portion of said foil with a shape retaining amount of a shape retaining refractory material.
Claim 7
Dependent Claim
18 words
The method of claim 2 wherein said sintered coating has a thickness of about 0.lmm to about 0.75mm.
Claim 8
Dependent Claim
21 words
The method of claim 5 and further comprising removing said shape retaining material after step (iii) and prior to step (iv).
Claim 9
Dependent Claim
41 words
The method of claim 2 wherein said die includes a surface portion which is free of a radially extending ledge for supporting said veneering material and wherein step (ii) includes building a radially extending ledge on said surface with said alloy.
Claim 10
Dependent Claim
12 words
The method of claim 8 wherein said ledge is a lingual ledge.
Claim 11
Dependent Claim
12 words
The method of claim 8 wherein said ledge is a mesial ledge.
Claim 12
Dependent Claim
12 words
The method of claim 8 wherein said ledge is a distal ledge.
Claim 13
Dependent Claim
12 words
The method of claim 8 wherein said ledge is a buccal ledge.
Claim 14
Dependent Claim
24 words
The method of claim 2 wherein in step (iv), the initial coating of such material is applied over the entire height of said coping.
Claim 15
Dependent Claim
30 words
The method of claim 13 wherein said alloy is about 78-80% by weight Pd and includes copper and gallium and optionally include one or more of gold, ruthenium and indium.
Claim 16
Dependent Claim
25 words
The method of claim 13 wherein said alloy has a melting range of about 2145° F. to about 2210° F. and includes about 2%-6% Au.
Claim 17
Dependent Claim
20 words
The method of claim 2 wherein said foil is a laminate of a gold layer bonded to a palladium layer.
Claim 18
Dependent Claim
12 words
The method of claim 1 wherein said foil is free of slits.
Claim 19
Dependent Claim
20 words
The method of claim 1 wherein said alloy is applied on substantially the entire external surface of said conforming foil.
Claim 20
Dependent Claim
18 words
The method of claim 17 wherein teh alloyws of step (ii) are applied in a series of steps.
References Cited (Backward Citations)
US1172918A
Cited
US1734676A
Cited
US4062676A
Cited
US4132830A
Cited
US4181757A
Cited
US4273580A
Cited
US4459112A
Cited
US4492579A
Cited
US4698021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |