Patent US5183834A successfully refreshed from Google Patents.
US5183834A
Expired / Lapsed
US
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Pasty dental veneer making composition
Assignee: Dentsply GmbH
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Filing: 1989-04-05
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Granted: 1993-02-02
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Expires: 2009-04-05
Abstract
Abstract A heat cured pasty composition adapted to form a dental veneer which is resistant or immune to interdental cracks while in use on crowns and bridges. The composition includes polymerizable urethane-acrylic monomer, inorganic fillers, pyrogenic silica, heat activated polymerization initiators, and fractured organic filler particles. Heat polymerization of the composition above about 100° C. forms a polymer which has a microhardness of at least HV 0.1/10 18.0 Kp/mm 2 , and an impact strength of at least 2.0 KJ/m 2 .
Inventors
- 👤 Karl J. Gorlich
- 👤 Fritz U. Bauer
- 👤 Joerg Konetzka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:47
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
A pasty dental composition adapted for heat polymerization above about 100° C. to form a polymer useful as a dental veneer comprising by weight about (a) 20-60% polymerizable urethane-acrylic binders, (b) 4.0-50% crushed silanized glass fillers, (c) 10-55% pyrogenic silica, (d) 0.05-3% alkylacylperoxide, (e) 0.05-3% heat activated nonperoxide initators, (f) 0.05-2% U.V. stabilizers, and (g) 10-60% fractured acrylic polymers.
Claim 2
Dependent Claim
59 words
A pasty dental composition adapted for heat polymerization above about 100° C. to form a polymer useful as a dental veneer comprising by weight about (a) 20-60% polymerizable urethane-acrylic binders, (b) 4.0-50% crushed silanized glass fillers, (c) 10-55% pyrogenic silica, (d) 0.05-3% alkylacylperoxide, (e) 0.05-3% heat activated nonperoxide initators, (f) 0.05-2% U.V. stabilizers, and (g) 10-60% fractured acrylic polymers.
Claim 3
Dependent Claim
55 words
A pasty dental composition adapted for heat polymerization above about 100° C. to form a polymer useful as a dental veneer comprising by weight about (a) 31-34% polymerizable uretane-acrylic binders, (b) 7-11% crushed silanized glass fillers, (c) 17-21% pyrogenic silica, (d) 0.3-0.6% tert-butyl-perisononanoate, (e) 0.3-0.6% benzopinacol, (f) 0.05-0.5% 2,4-dihydroxybenzophenone, and (g) 35-38% fractured acrylic polymers.
Claim 4
Dependent Claim
55 words
A pasty dental composition adapted for heat polymerization above about 100° C. to form a polymer useful as a dental veneer comprising by weight about (a) 31-34% polymerizable uretane-acrylic binders, (b) 7-11% crushed silanized glass fillers, (c) 17-21% pyrogenic silica, (d) 0.3-0.6% tert-butyl-perisononanoate, (e) 0.3-0.6% benzopinacol, (f) 0.05-0.5% 2,4-dihydroxybenzophenone, and (g) 35-38% fractured acrylic polymers.
Claim 5
Dependent Claim
24 words
The pasty dental composition adapted for heat polymerization above about 100° C. of claim 1 wherein said composition is polymerized to form a veneer.
Claim 6
Dependent Claim
24 words
The pasty dental composition adapted for heat polymerization above about 100° C. of claim 2 wherein said composition is polymerized to form a veneer.
Claim 7
Dependent Claim
66 words
A pasty dental composition adapted for heat polymerization above about 100° C. to form a veneer polymer having an impact strength of at least 2.0 KJ/M 2 , comprising by weight about (a) 20-60% polymerizable urethane-acrylic binders, (b) 4.0-50% crushed silanized glass fillers, (c) 10-55% pyrogenic silica, (d) 0.05-3% alkylacylperoxide, (e) 0.05-3% heat activated nonperoxide initators, (f) 0.05-2% U.V. stabilizers, and (g) 10-60% fractured acrylic polymers.
Claim 8
Dependent Claim
66 words
A pasty dental composition adapted for heat polymerization above about 100° C. to form a veneer polymer having an impact strength of at least 2.0 KJ/M 2 , comprising by weight about (a) 20-60% polymerizable urethane-acrylic binders, (b) 4.0-50% crushed silanized glass fillers, (c) 10-55% pyrogenic silica, (d) 0.05-3% alkylacylperoxide, (e) 0.05-3% heat activated nonperoxide initators, (f) 0.05-2% U.V. stabilizers, and (g) 10-60% fractured acrylic polymers.
Claim 9
Dependent Claim
62 words
A pasty dental composition adapted for heat polymerization above about 100° C. to form a veneer polymer having an impact strength of at least 2.0 KJ/M 2 , comprising by weight about (a) 31-34% polymerizable urethane-acrylic binders, (b) 7-11% crushed silanized glass fillers, (c) 17-21% pyrogenic silica, (d) 0.3-0.6% tert-butyl-perisononanoate, (e) 0.3-0.6% benzopinacol, (f) 0.05-0.5% 2,4-dihydroxybenzophenone, and (g) 35-38% fractured acrylic polymers.
Claim 10
Dependent Claim
62 words
A pasty dental composition adapted for heat polymerization above about 100° C. to form a veneer polymer having an impact strength of at least 2.0 KJ/M 2 , comprising by weight about (a) 31-34% polymerizable urethane-acrylic binders, (b) 7-11% crushed silanized glass fillers, (c) 17-21% pyrogenic silica, (d) 0.3-0.6% tert-butyl-perisononanoate, (e) 0.3-0.6% benzopinacol, (f) 0.05-0.5% 2,4-dihydroxybenzophenone, and (g) 35-38% fractured acrylic polymers.
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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) | 1996-02-02 | 1996-08-03 | 1997-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-02 | 2000-08-03 | 2001-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-02 | 2004-08-03 | 2005-02-02 | $7700.00 | Window Closed / Lapsed |