PROBLEM TO BE SOLVED: To provide a composition for dentistry, excellent in mechanical strength, polishing luster and transparency of its cured material and also having good operability of its paste.SOLUTION: This composition for dentistry contains (A) a polymerizable monomer component, (B) an amorphous filler containing silica-based fine particles, and an oxide covering the surface of the silica-based fine particles and containing a zirconium atom, a silicon atom and an oxygen atom, and (C) a polymerization initiator, wherein, the polymerizable monomer component (A) contains (a) an aromatic polymerizable monomer having a hydroxy group, (b) an aromatic polymerizable monomer without having the hydroxy group and (c) an aliphatic polymerizable monomer, and in the polymerizable monomer component (A), the contents of the polymerizable monomers (a), (b) and (c) are 20 to 60 mass% (a), 20 to 60 mass% (b) and 5 to 45 mass% (c), respectively.COPYRIGHT: (C)2010,JPO&INPIT【課題】硬化物の機械的強度、研磨滑沢性、及び透明性に優れ、かつペーストの操作性が良好な歯科用組成物を提供する。【解決手段】重合性単量体成分(A)、シリカ系微粒子と、当該シリカ系微粒子の表面を被覆する、ジルコニウム原子、珪素原子及び酸素原子を含有する酸化物とを含む非晶質の充填材(B)、及び重合開始剤(C)を含んでなる歯科用組成物であって、前記重合性単量体成分(A)が、水酸基を有する芳香族重合性単量体(a)、水酸基を有しない芳香族重合性単量体(b)、及び脂肪族重合性単量体(c)を含み、前記重合性単量体成分(A)中において、重合性単量体(a)、(b)、及び(c)の含有量が、(a)20~60質量%、(b)20~60質量%、及び(c)5~45質量%である歯科用組成物とする。【選択図】図1
