US4742861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and material for dental structures
Assignee: Individual
•
Filing: 1986-12-02
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Granted: 1988-05-10
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Expires: 2006-12-02
Abstract
Abstract A dental material and method for forming, reinforcing or repairing a dental restoration comprising a combination of a high fusing temperature metal component in a major proportion and a low fusing temperature component in a minor proportion. A binder may be added to form a putty-like consistency. The dental material is molded into a predetermined shape and heat treated at a temperature which will substantially melt the low fusing metal components but below the melting temperature of the high fusing metal component for forming a porous, sponge-like mass of interconnected particles of the high fusing temperature metal component. A filler material having a low melting temperature is then added to the porous mass and the mass is again treated to form a solid mass.
Inventors
- 👤 Itzhak Shoher
- 👤 Aharon E. Whiteman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:22
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844; B; B22; B22F; B22F1/00; B22F1/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
161 words
A method for forming reinforcing or repairing a dental restoration comprising forming a material composition of metal particles composed substantially of a high fusing temperature metal component and a low fusing temperature component with the low fusing component being in a minor proportion relative to the high fusing temperature component; adding the material to the dental restoration to be reinforced or repaired; molding the material composition into a predetermined shape; heat treating the material composition at a temperature below the melting temperature of said high fusing temperature metal component and at a temperature level sufficient to cause substantial melting of said low fusing temperature component for forming a porous sponge-like mass of interconnected particles particles of said high fusing temperature metal component; adding particles of a low melting temperature filler to said porous sponge-like mass of metal and heat treating said filler particles to cause said filler particles to melt into the sponge-like mass whereby a solid reinforced structure is formed.
Claim 2
Independent Claim
161 words
A method for forming reinforcing or repairing a dental restoration comprising forming a material composition of metal particles composed substantially of a high fusing temperature metal component and a low fusing temperature component with the low fusing component being in a minor proportion relative to the high fusing temperature component; adding the material to the dental restoration to be reinforced or repaired; molding the material composition into a predetermined shape; heat treating the material composition at a temperature below the melting temperature of said high fusing temperature metal component and at a temperature level sufficient to cause substantial melting of said low fusing temperature component for forming a porous sponge-like mass of interconnected particles particles of said high fusing temperature metal component; adding particles of a low melting temperature filler to said porous sponge-like mass of metal and heat treating said filler particles to cause said filler particles to melt into the sponge-like mass whereby a solid reinforced structure is formed.
Claim 3
Dependent Claim
20 words
A method as defined in claim 1 wherein said material composition of metal particles comprises precious metals and a binder.
Claim 4
Dependent Claim
25 words
A method as defined in claim 2 wherein said high fusing temperature metal component comprising particles selected from the class consisting of platinum and palladium.
Claim 5
Dependent Claim
33 words
A method as defined in claim 3 wherein the melting temperature of said high fusing temperature component is above about 1300° C. and wherein said heat treating temperature is below about 1200° C.
Claim 6
Dependent Claim
15 words
A method as defined in claim 4 wherein said low fusing temperature component comprises gold.
Claim 7
Dependent Claim
24 words
A method as defined in claim 5 wherein said high fusing temperature metal particles are of a size no greater than about 100 microns.
Claim 8
Dependent Claim
18 words
A method as defined in claim 6 wherein said filler comprises particles of a metal or metal alloy.
Claim 9
Dependent Claim
13 words
A method as defined in claim 7 wherein said filler particles comprise gold.
Claim 10
Dependent Claim
24 words
A method as defined in claim 1 wherein said filler comprises a ceramic composition or a resin or a resin filled dental composite material.
Claim 11
Dependent Claim
12 words
A method as defined in claim 9 wherein said ceramic is porcelain.
Claim 12
Dependent Claim
30 words
A method as defined in claim 3 wherein said high fusing metal component comprises up to about 50--75% by weight of the combination of high and low fusing metal components.
References Cited (Backward Citations)
US3502466A
Cited
EP0052922A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |