US4028325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite dental material and method of preparing same
Assignee: Individual
•
Filing: 1975-03-07
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Granted: 1977-06-07
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Expires: 1995-03-07
Abstract
Abstract A composite material and method of preparing same for use in prosthetic dentistry. The composition includes silica glass containing between about 8.0-30% on a weight basis of alkaline earth metal oxides and/or alkali metal oxides in solution selected from the group consisting of calcium oxide, magnesium oxide, sodium oxide, potassium, and lithium oxide. In one form of the invention, a methacrylate resin is coupled to the silica glass by a silane mixture. The invention includes the method of forming the composite material through both a cold curing system and a heat cured system into a composite veneering and tooth material which is useful in forming crowns and other dental restorations as well as artificial teeth requiring aesthetic appearance of normal dentition. The finally formed dental material shows a high hardness factor in combination with a high wear resistance. The composite material has the capability of being highly polishable and provides for low toxicity as well as a low index which allows optical matching of the composite material to naturally formed teeth.
Inventors
- 👤 Alan G. King
- 👤 Leon Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:02
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; C08K9/06; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
89 words
A composite material for use in dentistry principally comprising: (A) silica glass composition consisting of on a weight basis of between about 7.0-18.0% of alkaline earth metal oxides in solution wherein said alkaline earth metal oxides are selected from the group consisting of calcium oxide, and magnesium oxide; and, (B) a methacrylate resin coupled to said silica glass by a silane mixture, said composite material including on a weight basis approximately 100 parts of said silica glass composition to between approximately 13.5 to 65 parts of said methacrylate resin.
Claim 2
Dependent Claim
89 words
A composite material for use in dentistry principally comprising: (A) silica glass composition consisting of on a weight basis of between about 7.0-18.0% of alkaline earth metal oxides in solution wherein said alkaline earth metal oxides are selected from the group consisting of calcium oxide, and magnesium oxide; and, (B) a methacrylate resin coupled to said silica glass by a silane mixture, said composite material including on a weight basis approximately 100 parts of said silica glass composition to between approximately 13.5 to 65 parts of said methacrylate resin.
Claim 3
Dependent Claim
25 words
The composite material as recited in claim 1 wherein said calcium oxide on a weight basis is between approximately 0.0- 15.05% of said silica glass.
Claim 4
Dependent Claim
24 words
The composite material as recited in claim 1 wherein said magnesium oxide on a weight basis is between approximately 0.0-5.0% of said silica glass.
Claim 5
Dependent Claim
26 words
The composite material as recited in claim 1 wherein said alkaline earth metal oxides on a weight basis is between approximately 7.0-13.0% of said silica glass.
Claim 6
Dependent Claim
14 words
The composite material as recited in claim 1 wherein said methacrylate resin is BisGMA.
Claim 7
Dependent Claim
22 words
The composite material as recited in claim 1 wherein said composition (B) is a resin solution composed of methyl methacrylate and dimethacrylate.
Claim 8
Dependent Claim
89 words
A composite material for use in dentistry principally comprising: (A) silica glass composition consisting of on a weight basis of between about 1.0-20.0% of alkali metal oxides in solution wherein said alkali metal oxides are selected from the group consisting of sodium oxide, potassium oxide and lithium oxide; and, (B) a methacrylate resin coupled to said silica glass by a silane mixture, said composite material including on a weight basis approximately 100 parts of said silica glass composition to between approximately 13.5 to 65 parts of said methacrylate resin.
Claim 9
Dependent Claim
89 words
A composite material for use in dentistry principally comprising: (A) silica glass composition consisting of on a weight basis of between about 1.0-20.0% of alkali metal oxides in solution wherein said alkali metal oxides are selected from the group consisting of sodium oxide, potassium oxide and lithium oxide; and, (B) a methacrylate resin coupled to said silica glass by a silane mixture, said composite material including on a weight basis approximately 100 parts of said silica glass composition to between approximately 13.5 to 65 parts of said methacrylate resin.
Claim 10
Dependent Claim
25 words
The composite material as recited in claim 7 wherein said sodium oxide on a weight basis is between approximately 14.0 18.0% of said silica glass.
Claim 11
Dependent Claim
24 words
The composite material as recited in claim 7 wherein said potassium oxide on a weight basis is between approximately 0.0-11.0% of said silica glass.
Claim 12
Dependent Claim
25 words
The composite material as recited in claim 7 wherein said lithium oxide on a weight basis is between approximately 0.0- 8.0% of said silica glass.
Claim 13
Dependent Claim
14 words
The composite material as recited in claim 7 wherein said methacrylate resin is BisGMA.
Claim 14
Dependent Claim
22 words
The composite material as recited in claim 7 wherein said composition (B) is a resin solution composed of methyl methacrylate and dimethacrylate.
Claim 15
Dependent Claim
25 words
The composite material as recited in claim 7 wherein said alkali metal oxides on a weight basis is between approximately 10.0-27.0% of said silica glass.
Claim 16
Dependent Claim
91 words
A composite material for use in dentistry principally comprising: (A) silica glass composition consisting of on a weight basis of between approximately 8.0-30.0% of metal oxides in solution wherein said metal oxides are selected from the group consisting of sodium oxide, potassium oxide, lithium oxide, calcium oxide, and magnesium oxide; and, (B) a methacrylate resin coupled to said silica glass by a silane mixture, said composite material including on a weight basis approximately 100 parts of said silica glass composition to between approximately 13.5 to 65 parts of said methacrylate resin.
Claim 17
Dependent Claim
91 words
A composite material for use in dentistry principally comprising: (A) silica glass composition consisting of on a weight basis of between approximately 8.0-30.0% of metal oxides in solution wherein said metal oxides are selected from the group consisting of sodium oxide, potassium oxide, lithium oxide, calcium oxide, and magnesium oxide; and, (B) a methacrylate resin coupled to said silica glass by a silane mixture, said composite material including on a weight basis approximately 100 parts of said silica glass composition to between approximately 13.5 to 65 parts of said methacrylate resin.
Claim 18
Dependent Claim
14 words
The composite material as recited in claim 14 wherein said methacrylate resin is BisGMA.
Claim 19
Dependent Claim
14 words
The composite material as recited in claim 15 including (D) a dimethacrylate resin solution.
Claim 20
Dependent Claim
15 words
The composite material as recited in claim 15 including (D) a methyl methacrylate resin solution.
Claim 21
Dependent Claim
25 words
The composite material as recited in claim 14 wherein said metal oxides on a weight basis is between approximately 10.0- 27.0% of said silica glass.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |