US4512743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for masking discoloration on teeth
Assignee: Dentsply Research and Development Corp
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Filing: 1982-02-05
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Granted: 1985-04-23
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Expires: 2002-02-05
Abstract
Abstract A polymerizable composition comprising liquid polymerizable acrylic monomer, a polymerization initiator for the monomer, sub-micron silica, and pigments, is employed as a dental veneer to mask tooth discoloration.
Inventors
- 👤 Edward A. Santucci
- 👤 William B. Racz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:06
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A method for masking discoloration on a tooth comprising the steps of: (a) etching the surface of a tooth to be treated with an etching composition, said surface being substantially free of surface film; (b) cleaning the etched tooth surface to remove the etching composition and debris; (c) drying the etched tooth surface; and (d) coating the dry etched tooth surface with a polymerizable composition having a viscosity at 24°+1° C. of 100,000 to 300,000 centipoises, said polymerizable composition comprising liquid polymerizable acrylic ester monomer, a polymerization initiator for said monomer, sub-micron silica filler, and a color concentrate containing pigments appropriate to match the appearance of the natural tooth enamel, the proportion of said filler being selected so as to impart levelling and nonslump properties to said polymerizable composition.
Claim 2
Independent Claim
129 words
A method for masking discoloration on a tooth comprising the steps of: (a) etching the surface of a tooth to be treated with an etching composition, said surface being substantially free of surface film; (b) cleaning the etched tooth surface to remove the etching composition and debris; (c) drying the etched tooth surface; and (d) coating the dry etched tooth surface with a polymerizable composition having a viscosity at 24°+1° C. of 100,000 to 300,000 centipoises, said polymerizable composition comprising liquid polymerizable acrylic ester monomer, a polymerization initiator for said monomer, sub-micron silica filler, and a color concentrate containing pigments appropriate to match the appearance of the natural tooth enamel, the proportion of said filler being selected so as to impart levelling and nonslump properties to said polymerizable composition.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said liquid polymerizable acrylic ester monomer comprises bis-GMA, bisphenol-A dimethyacrylate, and triethylene glycol dimethacrylate.
Claim 4
Dependent Claim
14 words
The method of claim 1 or 2 wherein said sub-micron silica is fumed silica.
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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |