Patent US1988807A successfully refreshed from Google Patents.
US3971754A
Expired / Lapsed
US
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X-ray opaque, enamel-matching dental filling composition
Assignee: MISSION DENTAL N J Inc 4397 SWAMP ROAD DOYLESTOWN PA 18901 A CORP OF NEW JERSEY
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Filing: 1973-12-10
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Granted: 1976-07-27
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Expires: 1993-12-10
Abstract
Abstract An enamel-matching dental filling composition which is x-ray opaque and optically translucent utilizes a binder mixed with a ground glass filler containing compounds selected from the class consisting of oxides and carbonates of lanthanum, hafnium, strontium and tantalum.
Inventors
- 👤 Anton Jurecic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:46
CPC Classifications
C; C03; C03C; C03C4/00; A; A61; A61K; A61K6/00; A61K6/15; A61K6/16; A61K6/17; A61K6/70; A61K6/71; A61K6/77; A61K6/80; A61K6/802; A61K6/82; A61K6/824; C03C2204/00; C03C2204/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
In a dental filling composition having a binder resin made of condensation products from the reaction of bisphenol A with glycidyl methacrylate, said binder being in the presence of a diluent and intermixed with a fused glass filler in finely divided particulate form containing 25 to 50 weight percent SiO 2 and a sufficient amount of fluxing agent to bring the fusion temperature below 1350°C, the improvement comprising said glass filler including, at the time of fusing thereof, about 5 to 60 percent by weight of a compound selected from the class consisting of oxides and carbonates of lanthanum, hafnium, strontium and tantalum, to provide a non-toxic, x-ray opaque and optically translucent restorative matrix resistant to oral fluids.
Claim 2
Dependent Claim
118 words
In a dental filling composition having a binder resin made of condensation products from the reaction of bisphenol A with glycidyl methacrylate, said binder being in the presence of a diluent and intermixed with a fused glass filler in finely divided particulate form containing 25 to 50 weight percent SiO 2 and a sufficient amount of fluxing agent to bring the fusion temperature below 1350°C, the improvement comprising said glass filler including, at the time of fusing thereof, about 5 to 60 percent by weight of a compound selected from the class consisting of oxides and carbonates of lanthanum, hafnium, strontium and tantalum, to provide a non-toxic, x-ray opaque and optically translucent restorative matrix resistant to oral fluids.
Claim 3
Dependent Claim
45 words
The composition of claim 1 wherein said glass filler includes, at the time of fusion, a sufficient amount of fluxing agent selected from the class consisting of Na 3 AlF 6 and CaF 2 to lower the fusion temperature of the glass to below 1350°C.
Claim 4
Dependent Claim
30 words
The composition of claim 2 wherein said glass filler contains between about 25 and 40 percent of the x-ray opaquing compounds and about 25 to 50 percent SiO 2 .
Claim 5
Dependent Claim
43 words
The composition of claim 3 wherein the glass filler at the time of fusing includes between about 5 to 30 percent of a glass network reinforcing agent selected from the class consisting of Al 2 O 3 and H 3 BO 3 .
Claim 6
Dependent Claim
25 words
The composition of claim 4 wherein the glass filler when intermixed with the binder resin has an average particle size of less than 30 microns.
Claim 7
Dependent Claim
21 words
The composition of claim 1 wherein the glass particles are coated with vinyl silane prior to intermixing with the binder resin.
Claim 8
Dependent Claim
27 words
The composition of claim 6 wherein about 4 to 6 parts of glass filler is intermixed with one part of binder resin paste containing a polymerization catalyst.
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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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |