Patent ID: 8822564

Claim:
A dental restorative composition, comprising: a polymerizable resin; a substantially translucent inorganic structural filler having a refractive index substantially similar to that of the polymerizable resin, wherein the structural filler consists of: an inorganic coarse particle fraction having a first mean particle size in the range of about 4-7 μm and a D(10)≧1.2 μm, an inorganic fine particle fraction having a second mean particle size greater than 0.1 μm and smaller than the first mean particle size of the coarse particle fraction and a D(90)≦0.9 μm, and optionally a silane surface treatment on the inorganic coarse particle fraction or the inorganic fine particle fraction or both, wherein a relative ratio of the coarse particle fraction to the fine particle fraction is in the range from about 12:1 to about 2:1 by volume, and the particle size distributions of each of the coarse and fine particle fractions are essentially monomodal; a nanofiller having a mean particle size less than 100 nm; and at least one rheology-modifying additive.