US3801344A
Expired / Lapsed
US
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Tooth filling and facing compositions comprising a radiopaque glass and method of making the same
Assignee: Kimble Glass Inc
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Filing: 1971-06-30
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Granted: 1974-04-02
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Expires: 1991-06-30
Abstract
Abstract A filler composition for tooth filling and facing compositions comprising (1) a finely divided inorganic material, and (2) a barium aluminosilicate glass or other glass having an effective amount of radiopaque oxide that renders the resultant glass radiopaque to X-rays used by dentists. The filler composition is mixed with an organic polymer such as methyl methacrylate to provide a tooth filling and facing composition having an outstanding combination of desirable properties including a color resembling that of natural teeth, a suitable index of refraction, hardness, wear resistance, a relatively low thermal expansion matching that of natural teeth, and being radiopaque to X-rays used by dentists.
Inventors
- 👤 E Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
41 words
A composition as defined in claim 1 in which the barium aluminosilicate glass consists essentially of BaO, Al2O3 and SiO2 in the relative proportions of weight shown inside the area of line II shown in the ternary diagram of the FIGURE.
Claim 2
Dependent Claim
49 words
A composition as defined in claim 2 in which 70 parts by weight of a glass-ceramic consisting essentially of SiO2, Li2O, Na2O, K2O, CaO, Sb3O3, Al2O3, ZrO2, and TiO2 are used with about 30 parts by weight of a glass having the following ingredients in approximate percent by weight:
Claim 3
Dependent Claim
20 words
A composition as defined in claim 3 in which the glass-ceramic contains the following ingredients in approximate percent by weight:
Claim 4
Dependent Claim
25 words
A composition as defined in claim 1 in which the particle size of said finely divided glass-ceramic material is between about 100 and 200 mesh.
Claim 5
Dependent Claim
26 words
A composition as defined in claim 1 in which said glass-ceramic material consists of essentially of SiO2, Li2O, Na2O, K2O, CaO, Sb2O3, Al2O3, ZrO2 and TiO2.
Claim 6
Dependent Claim
37 words
A composition as defined in claim 1 in which the amount of glass-ceramic material is about 60 to 80 parts by weight and the amount of barium aluminosilicate glass is about 20 to 40 parts by weight.
Claim 7
Dependent Claim
37 words
A composition as defined in claim 7 in which the amount of glass-ceramic material is about 70 to 75 parts by weight and the amount of barium aluminosilicate glass is about 25 to 30 parts by weight.
Claim 8
Dependent Claim
41 words
A composition as defined in claim 1 in which the barium aluminosilicate glass consists essentially of about 25 to 35 percent by weight SiO2, about 10 to 20 percent by weight Al2O3 and about 50 to 60 percent by weight BaO.
Claim 9
Dependent Claim
41 words
A composition as defined in claim 1 in which the barium aluminosilicate glass consists essentially of about 18 to 32 percent by weight SiO2, about 8 to 22 percent by weight Al2O3 and about 56 to 62 percent by weight BaO.
Claim 10
Dependent Claim
23 words
A composition as defined in claim 1 in which said barium aluminosilicate glass has an X-ray linear absorption coefficient between 223 and 626.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |