Method of producing a composite resin, preferably for use as a dental material

A method of producing a dental restoration composite containing an organic resin and inorganic porous particles which comprises impregnating open porous inorganic particles with an at least partially hardenable resin material, compressing in such a way that the particles contact each other and the pressure in the resin is equalized by viscous flow of excess resin through the pores of the inorganic particles, bonding together by hardening of at least a portion of the hardenable resin material thereby forming a resin structure including a polymer impregnated contiguous inorganic phase wherein the porous inorganic particles comprise a rigid three-dimensional network of inorganic fibers fused together by heating at a temperature sufficient to cause melting and complete fusing together of substantially all individual fibers at their points of contact into a network where the porosity is continuous throughout the network.