US3911581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tooth filling and facing composition comprising a radiopaque glass and method of using the same
Assignee: Kimble Glass Inc
•
Filing: 1972-04-25
•
Granted: 1975-10-14
•
Expires: 1992-04-25
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
- 👤 Earl D Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:51
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
116 words
THE NEW USE FOR A BARUIM ALUMINOSILICATE GLASS HAVING A BAO CONTENT GREATER THAN 22.5 PERCENT BY WEIGHT, SAID NEW USE COMPRISING THE STEPS OF: A. FORMING A FILLING OR FACING MATERIAL BY COMBINING SAID BARIUM ALUMINOSILICATE GLASS AND A FINELY DIVIDED INORGANIC MATERIAL TO FORM A FILLER COMPOSITION, AND AN ORGANIC POLYMER AS A BINGER THEREFOR, SAID FILLING OR FACING MATERIAL CONTAINING ABOUT 20-80 PARTS BY WEIGHT OF SAID FILLER COMPOSITION AND 80-20 PARTS BY WEIGHT OF SAID ORGANIC POLYMER BINDER, SAID PARTS BY WEIGHT BEING BASED ON THE TOTSAL WEIGHT OF SAID FILLING OR FACING MATERIAL, AND SAID FILLER COMPOSITION CONTAINING 50-90 PARTS BY WEIGHT OF SAID FINELY DIVIDED INORGANIC MATERIAL AND 10-50 PARTS
Claim 2
Dependent Claim
116 words
THE NEW USE FOR A BARUIM ALUMINOSILICATE GLASS HAVING A BAO CONTENT GREATER THAN 22.5 PERCENT BY WEIGHT, SAID NEW USE COMPRISING THE STEPS OF: A. FORMING A FILLING OR FACING MATERIAL BY COMBINING SAID BARIUM ALUMINOSILICATE GLASS AND A FINELY DIVIDED INORGANIC MATERIAL TO FORM A FILLER COMPOSITION, AND AN ORGANIC POLYMER AS A BINGER THEREFOR, SAID FILLING OR FACING MATERIAL CONTAINING ABOUT 20-80 PARTS BY WEIGHT OF SAID FILLER COMPOSITION AND 80-20 PARTS BY WEIGHT OF SAID ORGANIC POLYMER BINDER, SAID PARTS BY WEIGHT BEING BASED ON THE TOTSAL WEIGHT OF SAID FILLING OR FACING MATERIAL, AND SAID FILLER COMPOSITION CONTAINING 50-90 PARTS BY WEIGHT OF SAID FINELY DIVIDED INORGANIC MATERIAL AND 10-50 PARTS
Claim 3
Dependent Claim
40 words
The new use as defined in claim 1 wherein said barium aluminosilicate glass consists essentially of BaO, Al2O3 and SiO2 in the relative proportions by weight shown inside the area of line I in the ternary diagram of FIG. 1.
Claim 4
Dependent Claim
39 words
The new use defined in claim 2 wherein said barium aluminosilicate glass consists essentially of BaO, Al2O3 and SiO2 in the relative proportions by weight shown inside the area of line II in the ternary diagram of FIG. 1.
Claim 5
Dependent Claim
41 words
The new use as defined in claim 1 wherein 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 6
Dependent Claim
41 words
The new use as defined in claim 1 wherein 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 7
Dependent Claim
35 words
The new use as defined in claim 1 wherein said inorganic material is selected from the group consisting of glass-ceramic material, quartz, fused silica, calcite, CaCO3 and wolasonite, having a low coefficient of thermal expansion.
Claim 8
Dependent Claim
25 words
The new use as defined in claim 6 wherein said glass-ceramic material consists essentially of SiO2, Li2O, Na2O, K2O, CaO, Sb2O3, Al2O3, ZrO2 and TiO2.
Claim 9
Dependent Claim
41 words
The new use as defined in 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 total weight of said filler composition.
Claim 10
Dependent Claim
41 words
The new use as defined in 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 total weight of said filler composition.
Claim 11
Dependent Claim
25 words
The new use as defined in claim 1 wherein the particle size of said finely divided inorganic material is between about 20 and 400 mesh.
Claim 12
Dependent Claim
23 words
The new use as defined in claim 1 wherein said barium aluminosilicate glass has an X-ray linear absorption coefficient of at least 200.
Claim 13
Dependent Claim
23 words
The new use as defined in claim 11 wherein said barium aluminosilicate glass has an X-ray linear absorption coefficient between 223 and 626.
Claim 14
Dependent Claim
30 words
The new use as defined in claim 1 wherein said organic polymer binder is an acrylic resin selected from the group consisting of polyethyl methacrylate, polyethyl acrylate, and polymethyl methacrylate.
Claim 15
Dependent Claim
34 words
The new use as defined in claim 1 wherein said barium aluminosilicate glass has a coefficient of thermal expansion in the range of about 55 X 10 7/*C to about 75 X 10 7/*C.
Claim 16
Dependent Claim
34 words
The new use as defined in claim 1 wherein said organic polymer binder is at least one polymer selected from the group consisting of acrylic resin, polyvinyl chloride, cellulose acetate and styrene acrylonitrile copolymer.
Claim 17
Dependent Claim
35 words
The new use as defined iN claim 1 wherein said organic polymer is a copolymer of an acrylic monomer and another copolymerizable monomer selected from the group consisting of styrene, butadiene, ethylene and acrylic acid.
References Cited (Backward Citations)
US3305371A
Cited
US3266147A
Cited
US3400097A
Cited
US3559288A
Cited
US3467534A
Cited
US3503128A
Cited
US3531303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |