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US4767798A
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Polymerizable radiopaque dental composition
Assignee: 3M Deutschland GmbH
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Filing: 1987-03-18
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Granted: 1988-08-30
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Expires: 2007-03-18
Abstract
Abstract A polymerizable, radiopaque dental composition comprising including: one or more ethylenically unsaturated, polymerizable monomer and/or polymer, possibly conventional fillers, pigments, initiators, activators, and thixotropic auxiliary material, as well as, in addition, a heavy-metal fluoride with very low solubility selected from the group consisting of YF3 and complex heavy-metal fluorides having the general formula MIIMIVF6, where MII is a calcium, strontium, or barium ion, and MIV is a titanium, zirconium, or hafniun ion. These filler compositions exhibit excellent X-ray visibility along with excellent optical properties.
Inventors
- 👤 Oswald Gasser
- 👤 Klaus Ellrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:04
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/006; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
36 words
A polymerizable, radiopaque dental composition, comprising: at least one ethylenically unsaturated, polymerizable substance selected from the group consisting of monomers and polymers; and YF 3 in a range of 5-30% by weight of the total composition.
Claim 2
Dependent Claim
36 words
A polymerizable, radiopaque dental composition, comprising: at least one ethylenically unsaturated, polymerizable substance selected from the group consisting of monomers and polymers; and YF 3 in a range of 5-30% by weight of the total composition.
Claim 3
Dependent Claim
32 words
A dental composition according to claim 1, which includes at least one of the group consisting of conventional fillers, pigments, and thixotropic auxiliary material, and also includes at least one polymerization initiator.
Claim 4
Dependent Claim
58 words
A dental composition according to claim 2, which includes up to 50% by weight of said monomer and polymer group, 30-70% by weight of said filler, pigment, and thixotropic auxiliary material group, 0.01-5% by weight of said polymerization initiator, and 5-30% by weight of YF 3 , with all said weight percentages being relative to the total composition.
Claim 5
Dependent Claim
24 words
A dental composition according to claim 1, in which said fluoride has an index of refraction in the range of from 1.45 to 1.60.
Claim 6
Dependent Claim
19 words
A dental composition according to claim 1, in which said fluoride is 10-20% by weight of the total composition.
Claim 7
Dependent Claim
20 words
A dental composition according to claim 5, in which said fluoride is approximately 15% by weight of the total composition.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |