US4292029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophobic composite restorative materials and their use in tooth treatment
Assignee: University of Michigan-Ann Arbor
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Filing: 1979-09-05
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Granted: 1981-09-29
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Expires: 1999-09-05
Abstract
Abstract Penetration of fluids between a tooth and a restoration is prevented, without chemical adhesive of the restorative material to the tooth by forming the restoration from a dental composition which is hydrophobic to the extent that the advancing contact angle of water or saliva on the restorative material is at least about 130 DEG . The hydrophobic nature of the contoured surface of the composite also minimizes staining by soluble dyes and accretion of hydrophilic gelatinous surface films.
Inventors
- 👤 Robert G. Craig
- 👤 William H. Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:45
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
200 words
In a process for treating a tooth, the steps comprising applying a polymerizable dental composition to a surface of the tooth, said composition comprising a mixture of from about 10 to about 90% by weight of a finely divided, inert organic filler and from about 90 to about 10% by weight of at least one polymerizable fluorine-containing prepolymer selected from the group consisting of perfluoroalkyl acrylates, aromatic diacrylates containing ring substituted fluorine, fluorinated acrylates of the formula ##STR5## where R 1 is a C 1 -C 4 alkyl group, R 2 is a fluorinated group selected from --(CF 2 ) n --CH 3 , --(CF 2 ) 3 , --φF 1-6 , and ##STR6## where φ is phenyl, n is an integer from 1 to about 8 and x is an integer from 1 to 3, and fluorinated analogues of aliphatic diacrylates and mixtures thereof; and polymerizing said composition on the tooth surface, said composition, when polymerized, (1) being hydrophobic such that the sum of the free surface energy changes as a result of saliva wetting the tooth surface and said polymerized composition is positive and (2) exhibiting an advancing contact angle in relation to water of at least 130°.
Claim 2
Dependent Claim
200 words
In a process for treating a tooth, the steps comprising applying a polymerizable dental composition to a surface of the tooth, said composition comprising a mixture of from about 10 to about 90% by weight of a finely divided, inert organic filler and from about 90 to about 10% by weight of at least one polymerizable fluorine-containing prepolymer selected from the group consisting of perfluoroalkyl acrylates, aromatic diacrylates containing ring substituted fluorine, fluorinated acrylates of the formula ##STR5## where R 1 is a C 1 -C 4 alkyl group, R 2 is a fluorinated group selected from --(CF 2 ) n --CH 3 , --(CF 2 ) 3 , --φF 1-6 , and ##STR6## where φ is phenyl, n is an integer from 1 to about 8 and x is an integer from 1 to 3, and fluorinated analogues of aliphatic diacrylates and mixtures thereof; and polymerizing said composition on the tooth surface, said composition, when polymerized, (1) being hydrophobic such that the sum of the free surface energy changes as a result of saliva wetting the tooth surface and said polymerized composition is positive and (2) exhibiting an advancing contact angle in relation to water of at least 130°.
Claim 3
Dependent Claim
176 words
In a process for treating a tooth, the steps comprising applying a polymerizable dental composition to a surface of the tooth, said composition comprising a mixture of from about 10 to about 90% by weight of a finely divided inert organic filler and from about 90 to about 10% by weight of at least one polymerizable fluorine-containing prepolymer selected from the group consisting of perfluoroalkyl acrylates, aromatic diacrylates containing ring substituted fluorine, fluorinated acrylates of the formula ##STR7## where R 1 is a C 1 -C 4 alkyl group, R 2 is a fluorinated group selected from --(CF 2 ) n --CH 3 , --(CF 2 ) 3 , --φF 1-6 , and --CF 2 CF--CF x H 3-x , where φ is phenyl, n is an integer from 1 to about 8, and x is an integer from 1 to 3, and fluorinated analogues of aliphatic diacrylates and mixtures thereof; and polymerizing said composition on the tooth surface, said composition, when polymerized, exhibiting an advancing contact angle in relation to water of at least 130°.
Claim 4
Dependent Claim
176 words
In a process for treating a tooth, the steps comprising applying a polymerizable dental composition to a surface of the tooth, said composition comprising a mixture of from about 10 to about 90% by weight of a finely divided inert organic filler and from about 90 to about 10% by weight of at least one polymerizable fluorine-containing prepolymer selected from the group consisting of perfluoroalkyl acrylates, aromatic diacrylates containing ring substituted fluorine, fluorinated acrylates of the formula ##STR7## where R 1 is a C 1 -C 4 alkyl group, R 2 is a fluorinated group selected from --(CF 2 ) n --CH 3 , --(CF 2 ) 3 , --φF 1-6 , and --CF 2 CF--CF x H 3-x , where φ is phenyl, n is an integer from 1 to about 8, and x is an integer from 1 to 3, and fluorinated analogues of aliphatic diacrylates and mixtures thereof; and polymerizing said composition on the tooth surface, said composition, when polymerized, exhibiting an advancing contact angle in relation to water of at least 130°.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein all of the fluorine-containing prepolymers, when more than one prepolymer is employed, are mutually soluble before and after polymerization.
Claim 6
Dependent Claim
25 words
The process of claim 2 wherein all of the fluorine-containing prepolymers, when more than one prepolymer is employed, are mutually soluble before and after polymerization.
Claim 7
Dependent Claim
13 words
The process of claim 2 wherein said fluorine-containing prepolymer comprises a perfluoroalkyl acrylate.
Claim 8
Dependent Claim
17 words
The process of claim 2 wherein said fluorine-containing prepolymer comprises an aromatic diacrylate containing ring substituted fluorine.
Claim 9
Dependent Claim
76 words
The process of claim 2 wherein said fluorine-containing prepolymer comprises a fluorinated acrylate of the formula: ##STR8## where R 1 is a C 1 -C 4 alkyl group, R 2 is a fluorinated group selected from --(CF 2 ) n --CH 3 , --(CF 2 ) 3 , --φF 1-6 , and ##STR9## φ is the phenyl radical, n is an integer from 1 to about 8, and x is an integer from 1 to 3.
Claim 10
Dependent Claim
17 words
The process of claim 2 wherein said fluorine-containing prepolymer comprises a fluorinated analogue of an aliphatic diacrylate.
Claim 11
Dependent Claim
17 words
The process of claim 1 in which said tooth surface is the surface of a tooth cavity.
Claim 12
Dependent Claim
17 words
The process of claim 2 in which said tooth surface is the surface of a tooth cavity.
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |