Patent ID: 6849112

Claim:
Inorganic particles as a dental material comprising silica in a range from 70 to 98 weight % and at least one oxide of at least one element selected from the group consisting of Zr, Ti, La, Ba, Sr, Hf, Y, Zn, AL, and B, wherein 5 to 70 weight % of the silica is originated from an acidic silicic acid solution and 30 to 95 weight % of the silica is originated from a sol of silica, said inorganic particles having an average particle diameter in a range from 1 to 10 μm, specific surface area in a range from 50 to 350 m 3 /g, pore volume in a range from 0.05 to 0.5 ml/g and amorphous crystallinity as observed by x-ray diffraction.