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An improved composite dental material includes an inorganic component of glass particles separated into two interconnected vitreous phases which have been etched to produce a porous surface layer. The inorganic glass particles are combined with an organic resin to provide the composite dental materi

An improved composite dental material includes an inorganic component of glass particles separated into two interconnected vitreous phases which have been etched to produce a porous surface layer. The inorganic glass particles are combined with an organic resin to provide the composite dental material. Preferable glass compositions include a mixture of silicon dioxide, boron oxide, aluminum oxide and strontium oxide, with one or more from the group of calcium oxide, zinc oxide, stannic oxide, and zirconium oxide as optional modifying ingredients.

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In a dental resin composite comprising a resin and a nontoxic filler, the improvement which comprises employment of a filler comprising a substantially transparent inorganic glass material which is a two-phase vitreous mixture of silicon dioxide (SiO2), boron oxide (B2O3), aluminum oxide (Al2O3) and

In a dental resin composite comprising a resin and a nontoxic filler, the improvement which comprises employment of a filler comprising a substantially transparent inorganic glass material which is a two-phase vitreous mixture of silicon dioxide (SiO2), boron oxide (B2O3), aluminum oxide (Al2O3) and at least one oxide selected from the group consisting of strontium oxide (SrO), calcium oxide (CaO) and zinc oxide (ZnO), and which is substantially free of monovalent elements, wherein the refractive indexes of the phases are within the range of 1.45 to 1.75; wherein the morphologies of the phases are two continuous, interpenetrating networks of submicroscopic dimension which interlock and twist one phase through the other; and wherein one of the phases is partially removed at the surface to define pores. Substantially transparent glass particles less than 5.0 millimeters in diameter consisting essentially of 51.4 mole % silicon oxide (SiO2), 15.2 mole % boron oxide (B2O3), 9.1 mole % aluminum oxide (Al2O3) and 24.3 mole % calcium oxide (CaO), said particles having as a morphology a two phase interpenetrating, twisting and interlocking network of submicroscopic dimension, with the low silica phase etched to a depth of less than 10,000 Angstroms, and suitable for use in a dental composite.