Claims
- 1. A dental restorative composition having a filler and a liquid resin binder, that is substantially opaque to dental diagnostic X-rays, and that is formed from ingredients that facilitate matching the infractive index of the binder with that of the filler, consisting essentially of:
- from 70% to 85% by weight of the composition of a mixture of finely divided inorganic filler materials;
- from 15% to 30% by weight of the composition of a liquid resin dimethacrylate binder; and
- a curing system for the liquid resin binder that will cause curing of the composition, upon admixture of the ingredients, in less than about ten minutes;
- said filler mixture consisting essentially of a transparent barium glass admixed with a different inorganic particulate filler material, that comprises amorphous silica, the barium glass providing about 60% by weight of the mixture and the balance of the mixture being an amount of a different, inorganic particulate filler material;
- said barium glass being formed from a mixture of BaO, B.sub.2 O.sub.3 Al.sub.2 O.sub.3, and SiO.sub.2, said glass being essentially free of monovalent elements and having a BaO content of at least 22.5% by weight thereof and that is substantially equal in molar percentage to the sum of the molar percentages of Al.sub.2 O.sub.3 and B.sub.2 O.sub.3 respectively;
- the filler content of the composition, and the BaO content of the filler, being such that the BaO content of the composition is in the range from about 15% to about 28% by weight of the composition.
- 2. A dental restorative composition in accordance with claim 1 wherein the liquid resin binder is formed from a mixture of dimethacrylates that includes at least 10% by weight of the liquid binder of a diluent cross-linker, and wherein said different inorganic particulate filler material is amorphous silica and constitutes about 40% of the filler mixture by weight.
- 3. A dental restorative composition in accordance with claim 2 wherein the mixture of dimethacrylates includes at least 30% by weight of the binder of the dimethacrylate of the diglycidyl ether of bisphenol-A and at least 10% by weight of a diluent cross-linker.
- 4. A dental restorative composition in accordance with claim 2 wherein at least a substantial portion of the liquid resin binder is a diester adduct of an alicyclic dicarboxylic acid selected from the group consisting of hexahydrophthalic acid, tetrahydrophthalic acid, and a maleic acid adduct of methyl cyclopentadiene.
Parent Case Info
This is a continuation of application Ser. No. 804,291, filed June 7, 1977, now abandoned.
US Referenced Citations (8)
Non-Patent Literature Citations (2)
Entry |
(I) Bowen, R. L., X-R-Opaque Reinforcing Fillers for Composite Materials, J. Dent. Res., 48, pp. 79-82 (1969). _ |
(II) Bowen, R. L., A New Series of X-Ray-Opaque Reinforcing Fillers forComposite Materials, J. Dent. Res., 51,177 (1972). _ |
Continuations (1)
|
Number |
Date |
Country |
Parent |
804291 |
Jun 1977 |
|