US3975203A
Expired / Lapsed
US
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Composition for use as a filler in tooth filling and facing composition and method of making the same
Assignee: Kimble Glass Inc
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Filing: 1974-02-20
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Granted: 1976-08-17
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Expires: 1994-02-20
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 resistant, a relatively low thermal expansion matching that of natural teeth, and being radiopaque to X-rays used by dentists.
Inventors
- 👤 Earl D. Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:33
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
93 words
A composition for use as a filler in tooth filling and facing compositions comprising 50-90 parts by weight of a finely divided inorganic material and 10-50 parts by weight of a barium aluminosilicate glass having a BaO content than about 22.5 percent by weight, the facing and filling composition being radiopaque to X-rays used by dentists, having a color like that of natural teeth, an index of refraction like that of natural teeth, high strength and wear resistance, and a low coefficient of thermal expansion matching that of natural teeth and being non-toxic.
Claim 2
Dependent Claim
93 words
A composition for use as a filler in tooth filling and facing compositions comprising 50-90 parts by weight of a finely divided inorganic material and 10-50 parts by weight of a barium aluminosilicate glass having a BaO content than about 22.5 percent by weight, the facing and filling composition being radiopaque to X-rays used by dentists, having a color like that of natural teeth, an index of refraction like that of natural teeth, high strength and wear resistance, and a low coefficient of thermal expansion matching that of natural teeth and being non-toxic.
Claim 3
Dependent Claim
41 words
The invention of claim 1 wherein said barium alumino-silicate glass consists essentially of BaO, Al 2 O 3 and SiO 2 in the relative proportions by weight shown inside the area of line I in the ternary diagram of the FIGURE.
Claim 4
Dependent Claim
41 words
The invention of claim 2 wherein said barium alumino-silicate glass consists essentially of BaO, Al 2 O 3 and SiO 2 in the relative proportions by weight shown inside the area of line II in the ternary diagram of the FIGURE.
Claim 5
Dependent Claim
42 words
The invention of claim 1 wherein the barium alumino-silicate glass consists essentially of about 18 to 32 percent by weight SiO 2 , about 8 to 22 percent by weight Al 2 O 3 and 56 to 62 percent by weight BaO.
Claim 6
Dependent Claim
43 words
The invention of claim 1 wherein the barium aluminosilicate glass consists essentially of about 25 to 35 percent by weight SiO 2 , about 10 to 20 percent by weight Al 2 O 3 and about 50 to 60 percent by weight BaO.
Claim 7
Dependent Claim
33 words
The invention of claim 1 wherein said inorganic material is selected from the group consisting of glass-ceramic material, quartz, fused silica, calcite, CaCO 3 and wollastonite, having a low coefficient of thermal expansion.
Claim 8
Dependent Claim
41 words
The invention of claim 6 wherein said glass-ceramic material consists essentially of SiO 2 , Li 2 O, Na 2 O, K 2 O, CaO, Sb 2 O 3 , Al 2 O 3 , ZrO 2 and TiO 2 .
Claim 9
Dependent Claim
46 words
The invention of claim 1 wherein said inorganic material constitutes 60 - 80 parts by weight and said barium aluminosilicate glass constitutes 20 - 40 parts by weight, said parts by weight being based upon the combined weight of said inorganic material and barium aluminosilicate glass.
Claim 10
Dependent Claim
46 words
The invention of claim 8 wherein said inorganic material constitutes 70 - 75 parts by weight and said barium aluminosilicate glass constitutes 25 - 30 parts by weight, said parts by weight being based upon the combined weight of said inorganic material and barium aluminosilicate glass.
Claim 11
Dependent Claim
22 words
The invention of claim 1 wherein the particle size of said finely divided inorganic material is between about 20 and 400 mesh.
Claim 12
Dependent Claim
22 words
The invention of claim 10 wherein the particle size of said finely divided inorganic material is between about 100 and 200 mesh.
Claim 13
Dependent Claim
20 words
The invention of claim 1 wherein said barium alumino-silicate glass has an X-ray linear absorption coefficient of at least 200.
Claim 14
Dependent Claim
20 words
The invention of claim 12 wherein said barium alumino-silicate glass has an X-ray linear absorption coefficient between 223 and 626.
Claim 15
Dependent Claim
33 words
The invention of claim 1 wherein said barium alumino-silicate glass has a coefficient of thermal expansion in the range of about 55 × 10.sup. -7 /°C to about 75 × 10.sup. -7 /°C.
Claim 16
Independent Claim
119 words
A method for making a composition for use as a filler in tooth facing and filling compositions having an outstanding balance of properties including being radiopaque to X-rays used by dentists, having a color like that of natural teeth, a index of refraction like that of natural teeth, high strength and wear resistance, and a low coefficient of thermal expansion matching that of natural teeth and being non-toxic, the method comprising the step of mixing together 50-90 parts by weight of a finely divided inorganic material and 10-50 parts by weight of a barium aluminosilicate glass containing a BaO content greater than about 22.5 percent by weight so that the resultant glass is radiopaque to X-rays used by dentists.
Claim 17
Independent Claim
119 words
A method for making a composition for use as a filler in tooth facing and filling compositions having an outstanding balance of properties including being radiopaque to X-rays used by dentists, having a color like that of natural teeth, a index of refraction like that of natural teeth, high strength and wear resistance, and a low coefficient of thermal expansion matching that of natural teeth and being non-toxic, the method comprising the step of mixing together 50-90 parts by weight of a finely divided inorganic material and 10-50 parts by weight of a barium aluminosilicate glass containing a BaO content greater than about 22.5 percent by weight so that the resultant glass is radiopaque to X-rays used by dentists.
Claim 18
Dependent Claim
41 words
The invention of claim 15 wherein said barium alumino-silicate glass consists essentially of BaO, Al 2 O 3 and SiO 2 in the relative proportions by weight shown inside the area of line I in the ternary diagram of the FIGURE.
Claim 19
Dependent Claim
41 words
The invention of claim 16 wherein said barium alumino-silicate glass consists essentially of BaO, Al 2 O 3 and SiO 2 in the relative proportions by weight shown inside the area of line II in the ternary diagram of the FIGURE.
Claim 20
Dependent Claim
33 words
The invention of claim 15 wherein said inorganic material is selected from the group consisting of glass-cermaic material, quartz, fused silica, calcite, CaCO 3 and wollastonite, having a low coefficient of thermal expansion.
Claim 21
Dependent Claim
22 words
The invention of claim 15 wherein the particle size of said finely divided inorganic material is between about 20 and 400 mesh.
Claim 22
Dependent Claim
20 words
The invention of claim 15 wherein said barium alumino-silicate glass has an X-ray linear absorption coefficient of at least 200.
Claim 23
Dependent Claim
34 words
The invention of claim 15 wherein said barium aluminosilicate glass has a coefficient of thermal expansion in the range of about 55 × 10.sup. -7 /°C to about 75 × 10.sup. -7 /20 C.
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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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |