Inorganic particles as a dental material and a method of...

Compositions: coating or plastic – Coating or plastic compositions – Dental

Reexamination Certificate

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C106S482000, C106S461000, C106S483000, C106S485000, C106S446000, C106S431000, C423S331000, C423S366000, C423S327100

Reexamination Certificate

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06849112

ABSTRACT:
Amorphous inorganic particles as a dental material includes silica and inorganic oxide(s) other than silica and has high x-ray impermeability. The inorganic particles as a dental material includes silica with the content in the range from 70 to 98 weight % and oxide(s) of one or more elements selected from the group 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. The inorganic particles as a dental material have an average particle diameter in the range from 1 to 10 μm, specific surface area in the range from 50 to 350 m2/g, pore volume in the range from 0.05 to 0.5 ml/g, amorphous crystallinity as observed by x-ray diffraction, and the refractive index in the range from 1.47 to 1.60.

REFERENCES:
patent: 6042727 (2000-03-01), Jones et al.
patent: 60-233007 (1985-11-01), None
patent: 7-196428 (1995-08-01), None
translation for JP 07-196428.

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