PROBLEM TO BE SOLVED: To provide a composition for dentistry, showing small polymerization shrinkage at curing, and providing a cured product having excellent flexural strength and high esthetic properties.SOLUTION: The composition for the dentistry contains a polymerizable monomer represented by general formula (1) {wherein, R1, R2, R3 and R4 are each a group represented by general formula (2) (wherein, Y1, Y2, Y3, Y4 and Y5 are each a hydrogen atom, a halogen atom or a 1-6C alkyl group) or a 1-6C alkyl group, with the proviso that at least one thereof is the group represented by general formula (2) R5 and R6 are each a hydrogen atom or a methyl group X1 and X2 are each an oxygen atom, a sulfur atom or NH k and l are each an integer of 2-12 and m and n are each an integer of 0-4}.COPYRIGHT: (C)2009,JPO&INPIT【課題】硬化時の重合収縮が小さく、硬化物の曲げ強度に優れ、かつ審美性の高い歯科用組成物を提供する。【解決手段】下記一般式(1)で表される重合性単量体を含む歯科用組成物。{式中、R1、R2、R3及びR4は、下記一般式(2)(式中、Y1、Y2、Y3、Y4及びY5は、水素原子、ハロゲン原子又は炭素数1~6のアルキル基を示す)で表される基、又は炭素数1~6のアルキル基であって、少なくとも1つは前記一般式(2)で表される基あり、R5及びR6は、水素原子又はメチル基であり、X1及びX2は、酸素原子、硫黄原子又はNHであり、k及びlは、2~12の整数であり、m及びnは、0~4の整数である}【選択図】なし
