Patent ID: 7678843

Claim:
A dental restorative material composition comprising: (a) a (meth)acrylate monomer; (b) an organic-inorganic composite filler having an average particle diameter of 5 to 50 μm, which is made by mixing a (meth)acrylate monomer and a fine particle filler having an average primary particle diameter of 0.005 to 0.3 μm and having X-ray impermeability, wherein a raw material of the fine particle filler having X-ray impermeability is at least one material selected from the group consisting of a transition element having an atomic number of higher than 39 or its compound, and a lanthanoid compound; (c) a fine particle filler having an average primary particle diameter of 0.005 to 0.04 μm; and (d) a photopolymerization initiator.