US4426404A
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Preparation of an intermediate layer between a high-melting dental metal alloy and dental porcelain
Assignee: DENTAIR IVOCLAR A LIECHTENSTEIN CORP Ets
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Filing: 1981-11-25
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Granted: 1984-01-17
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Expires: 2001-11-25
Abstract
Abstract A process for producing and intermediate layer between a high-melting dental alloy and a dental porcelain which comprises applying to said high-melting dental metal alloy a composition comprising. (a) at least a metal or a metal alloy which is thermally stable at a temperature of at least 800° C.; (b) gold or a gold compound which decomposes to metallic gold, or a gold alloy; (c) at least one flux; and (d) aluminum and/or solver or an aluminum-silver alloy or a silver compound which decomposes two metallic silver, in a liquid vehicle (A) in which component (c) is at least partially soluble, drying the so-treated high-melting dental metal alloy and sintering said composition and thereafter treating the so-sintered composition with a liquid (B) in which the non-metallic components of said composition are at least partially soluble.
Inventors
- 👤 Itzhak Shoher
- 👤 Aaron Whiteman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:17
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
138 words
A process for preparing and intermediate layer between a high-melting dental metal alloy and a dental porcelain which comprises applying to said high-melting dental metal alloy, a composition comprising the components: (a) at least a metal or a metal alloy which is thermally stable at a temperature of at least 800° C.; (b) gold or a gold compound which decomposes to metallic gold, or a gold alloy; (c) at least one flux; and (d) aluminum and/or silver or an aluminum--silver alloy or a silver compound which decomposes two metallic silver, in a liquid vehicle (A) in which component (c) is at least partially soluble, drying the so-treated high-melting dental metal alloy and sintering said composition and thereafter treating the so-sintered composition with a liquid (B) in which the non-metallic components of said composition are at least partially soluble.
Claim 2
Dependent Claim
138 words
A process for preparing and intermediate layer between a high-melting dental metal alloy and a dental porcelain which comprises applying to said high-melting dental metal alloy, a composition comprising the components: (a) at least a metal or a metal alloy which is thermally stable at a temperature of at least 800° C.; (b) gold or a gold compound which decomposes to metallic gold, or a gold alloy; (c) at least one flux; and (d) aluminum and/or silver or an aluminum--silver alloy or a silver compound which decomposes two metallic silver, in a liquid vehicle (A) in which component (c) is at least partially soluble, drying the so-treated high-melting dental metal alloy and sintering said composition and thereafter treating the so-sintered composition with a liquid (B) in which the non-metallic components of said composition are at least partially soluble.
Claim 3
Dependent Claim
20 words
A method according to claim 1, wherein said liquid vehicle (A) comprises water or a mixture of glycerol and ethanol.
Claim 4
Dependent Claim
23 words
A method according to claim 2, wherein the weight ratio between glycerol and ethanol in the liquid vehicle (A) amounts to approximately 1:1.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein a liquid (B) comprises a dilute mineral acid or a mixture of dilute mineral acids.
Claim 6
Dependent Claim
22 words
A method according to claim 4, wherein said acid or mixture of acids comprises 5-10% HCl and/or 5-10% HF in aqueous solution.
Claim 7
Dependent Claim
50 words
A method according to claim 1, wherein the suspension of said composition is applied to said dental metal alloy such as to form a coating thereon of thickness of about 0.2 to about 0.5 mm and said composition is sintered at rising temperatures up to about 800° to 1200° C.
Claim 8
Dependent Claim
31 words
A process according to claim 6, wherein after said composition has been sintered and treated with said liquid (B) a dental porcelain is applied to said sintered layer and fired thereon.
Claim 9
Dependent Claim
29 words
A method according to claim 7, wherein the high-melting dental metal alloy and/or the metal component (a) has a thermal expansion coefficient matched to that of said dental porcelain.
Claim 10
Dependent Claim
17 words
A method according to claim 8, wherein component (a) is in the form of a metal alloy.
Claim 11
Dependent Claim
31 words
A method according to claim 9, wherein said high-melting dental metal alloy or said component (a) alloy is an alloy comprising nickel, cobalt or chromium or mixtures thereof as principal components.
Claim 12
Dependent Claim
66 words
A method according to claim 10, wherein said high-melting dental metal alloy and/or metal alloy of component (a) has the following composition, in terms of percentages by weight: Ni and/or Co 60 to 85; Cr 11 to 32; Fe 0.2 to 0.6; Al 0 to 5; Mo 1.5 to 6; Si 0 to 1.2; Be 0 to 1.6; Cu 0 to 0.2; Mg 0 to 3.5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |