PROBLEM TO BE SOLVED: To provide a dental hardening composition as a resin material for dentistry cutting which reduces a distortion occurring inside a block in a step of molding by pressure and heat while maintaining mechanical properties, such as hardness, flexural strength, compressive strength, and esthetics which are required for a prosthetic material for a dental crown, and does not cause cracking or chipping.SOLUTION: The invention relates to a dental hardening composition for producing a block material containing the following (a)-(d): (a) 10-70 parts by weight of a polymerization monomer (b) 30-90 parts by weight of a filler (c) 0.01-10 parts by weight of a polymerization initiator and (d) 0.001-1 parts by weight of a chain transfer agent which is a terpenoid compound.COPYRIGHT: (C)2016,JPO&INPIT【課題】歯冠補綴物に求められる硬さ、曲げ強度、圧縮強度等の機械的特性や審美性を維持した上で、加圧加熱による成型過程において、ブロック内部で発生するひずみを低減しクラックやチッピングが起こらない、歯科切削加工用レジン材料としての歯科用硬化性組成物の提供。【解決手段】下記(a)~(d)を含むブロック材料を製造するための歯科用硬化性組成物。(a)重合性単量体10~70重量部、(b)充填材30~90重量部、(c)重合開始剤0.01~10重量部、及び(d)テルペノイド系化合物である連鎖移動剤0.001~1重量部。【選択図】なし
