US4224072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pit and fissure sealant for teeth
Assignee: University of Utah Research Foundation Inc
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Filing: 1978-09-11
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Granted: 1980-09-23
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Expires: 1998-09-11
Abstract
Abstract An inorganic, enamel-like sintered coating (or sealant) adherent to teeth is disclosed. Materials very similar to tooth enamel, e.g., hydroxyapatite, combined with a low melting eutectic constitute the coating. This material can be applied to the tooth and sintered in place with a laser. The presence of the low melting eutectic lowers the energy requirement for sintering.
Inventors
- 👤 Lygia Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:16
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/0046; A61K; A61K6/00; A61K6/30; A61K6/80; A61K6/831; A61K6/838
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A sinterable coating composition capable of being sintered in situ on a tooth surface by a low power laser, said coating composition comprising a slurry of hydroxyapatite and a sufficient amount of a compatible eutectic containing a fluoride compound to lower the sintering temperature of said composition to less than about 700° C.
Claim 2
Dependent Claim
53 words
A sinterable coating composition capable of being sintered in situ on a tooth surface by a low power laser, said coating composition comprising a slurry of hydroxyapatite and a sufficient amount of a compatible eutectic containing a fluoride compound to lower the sintering temperature of said composition to less than about 700° C.
Claim 3
Dependent Claim
22 words
The coating composition of claim 1, wherein said eutectic is present at about 10% to about 50% by weight of said coating.
Claim 4
Dependent Claim
15 words
The coating composition of claim 1 wherein calcium triphosphate is present in addition to hydroxyapatite.
Claim 5
Dependent Claim
28 words
The coating composition of claim 1 wherein said eutectic is present in sufficient quantities to enable said composition to sinter at about 200° C. to about 400° C.
Claim 6
Dependent Claim
22 words
The coating composition of claim 1 wherein said eutectic is an admixture consisting essentially of lithium fluoride, magnesium fluoride, and calcium fluoride.
References Cited (Backward Citations)
US3787900A
Cited
US4149893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |