PROBLEM TO BE SOLVED: To provide a complex restorative material for dental use that has high operability and high mechanical strength of paste, has high transparency, has an opal effect, and keeps the opal effect at a high degree even when the paste is stored in a long time.SOLUTION: The complex restorative material for dental use includes: (A) 100 pts.mass of a polymerizable monomer (B) spherical silica-titanium-group-oxide-based composite oxide particles [I-1] where the average primary particle diameter is in the range of 0.15-0.50 &mum and the standard deviation of particle diameter is within 1.30 (C) organic/inorganic composite filler where silica-titanium-group-oxide-based composite oxide fine particles [II-1] having an average primary particle diameter of 0.01-0.10 &mum are dispersed in an organic resin matrix by 50-75 mass% and the refractive index difference from a cured body of the polymerizable monomer (A) is 0.10 or lower and (D) an effective amount of polymerization initiator.COPYRIGHT: (C)2012,JPO&INPIT【課題】 ペーストの操作性や機械的強度が良好で、透明性に優れ、オパール効果も有する歯科用複合修復材料において、ペーストを長期間保存しても該オパール効果が高度に維持されるものを開発すること。【解決手段】 (A)重合性単量体100質量部、(B)平均一次粒子径が0.15~0.50μmの範囲であり、該粒子径分布の標準偏差が1.30以内にある球形のシリカ・チタン族酸化物系複合酸化物粒子〔I-1〕、(C)平均一次粒子径が0.01~0.10μmの範囲のシリカ・チタン族酸化物系複合酸化物微粒子〔II-1〕を有機樹脂マトリックス中に50~75質量%分散させてなる、(A)重合性単量体の硬化体との屈折率差が0.10以下である有機無機複合フィラー、および(D)有効量の重合開始剤を含んでなる歯科用複合修復材料。【選択図】 なし
