Patent US5078754A successfully refreshed from Google Patents.
US5078754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finishing/polishing system
Assignee: Dentsply Research and Development Corp
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Filing: 1988-08-01
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Granted: 1992-01-07
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Expires: 2008-08-01
Abstract
Abstract The invention relates to a system and apparatus and a method for finishing and polishing a dental composite restorative material in a tooth. The system of the invention uses an elastomeric polymer disc which is impregnated with an abrasive for reducing of the composite, and a felt, suede, or elastomeric polymer foam element for polishing the composite. A method of using the above apparatus in a finishing/polishing system is also provided.
Inventors
- 👤 Steven R. Jefferies
- 👤 Roy L. Smith
- 👤 Russell D. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:10
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/06; A61C15/00; A61C15/04; A61C15/041
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
47 words
An abrasive implement for gross reduction and shaping of composites which simultaneously reduces filler and resin in the composite comprising: a. about 19-35% elastomeric polymer, b. about 1-5% pyrogenic silica, and c. about 60-80% abrasive powder having a hardness greater than the hardness of said composite filler.
Claim 2
Dependent Claim
47 words
An abrasive implement for gross reduction and shaping of composites which simultaneously reduces filler and resin in the composite comprising: a. about 19-35% elastomeric polymer, b. about 1-5% pyrogenic silica, and c. about 60-80% abrasive powder having a hardness greater than the hardness of said composite filler.
Claim 3
Dependent Claim
61 words
The abrasive implement according to claim 1 in which the elastomeric polymer is formed from the polymerization of an alkyl urethane prepolymer having a molecular weight between about 1500 and 2500 and having a viscosity of about 10,000-35,000 cps at 25° C. and in which the abrasive powder has a hardness of between about 5.5-10 on the mohs scale of hardness.
Claim 4
Dependent Claim
15 words
The abrasive implement according to claim 1 in which the abrasive powder is aluminum oxide.
Claim 5
Dependent Claim
19 words
The abrasive implement according to claim 1 in which the elastomeric polymer is formed from a light cured prepolymer.
Claim 6
Dependent Claim
19 words
The abrasive implement according to claim 1 in which the elastomeric polymer is formed from a thermally cured prepolymer.
Claim 7
Dependent Claim
19 words
The abrasive implement according to claim 1 in which the elastomeric polymer is formed from a chemically cured prepolymer.
Claim 8
Dependent Claim
20 words
The abrasive implement according to claim 1 in which said abrasive powder comprises about 70% by weight of said implement.
Claim 9
Dependent Claim
30 words
The abrasive implement according to claim 1 in which said prepolymer comprises the reaction product of polyalkylene glycol, alkylene diisocyanate and a hydroxyalkyl ester of an ethylenically unsaturated carboxylic acid.
Claim 10
Dependent Claim
30 words
The abrasive implement according to claim 2 in which said prepolymer comprises the reaction product of polyalkylene glycol, alkylene diisocyanate and a hydroxyalky ester of an ethylenically unsaturated carboxylic acid.
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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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |