PROBLEM TO BE SOLVED: To provide a pigment-carrying noncrosslinked organic polymer particles including little free pigment, and to provide a dental restorative material comprising the powder material containing the polymer particles and a liquid material, and hardly causing unevenness of a color.SOLUTION: The powder-liquid dental restorative material containing a liquid material (A) containing a polymerizable monomer, (B) a powder material formed out of a noncrosslinked organic polymer dissolvable in the liquid material (A), and containing the inorganic pigment-carrying noncrosslinked organic polymer particles carrying the inorganic pigment on the surfaces of the particles, and a polymerization initiator contained at least in one of the liquid material (A) and the powder material (B) is regulated so as to use the inorganic pigment-carrying noncrosslinked organic polymer particles contained in the powder material (B), and having &le3 mass% of the proportion of the inorganic pigment dropped from the surfaces of the noncrosslinked organic polymer particles when a water dispersion thereof at 23°C in 10 mg/mL concentration of the inorganic pigment-carrying noncrosslinked polymer particles to be contained in the powder material is subjected to ultrasonic treatment of 15-50 kHz frequency for 1 min.COPYRIGHT: (C)2012,JPO&INPIT【課題】遊離顔料の少ない、顔料担持非架橋有機ポリマー粒子を提供すること、及び該ポリマー粒子を含む粉材と液材とから成る色ムラの無い歯科用修復材を提供することを目的とする。【解決手段】(A) 重合性単量体を含む液材、(B) 上記(A)液材に溶解する非架橋有機ポリマーにより形成され、その粒子表面に無機顔料を担持してなる無機顔料担持非架橋有機ポリマー粒子を含む粉材、および上記(A)液材若しくは上記(B)粉材の内少なくともいずれか一方に含まれる重合開始剤、を含む粉液型歯科用修復材において、上記(B)粉材に含有させる無機顔料担持非架橋有機ポリマー粒子として、濃度10mg/mlの23℃の水分散液を、周波数15-50kHzで1分間超音波処理した際に、該無機顔料の非架橋有機ポリマー粒子表面からの脱落率が3質量%以下であるものを用いることを特徴とする粉液型歯科用修復材とする。【選択図】 なし
