Disclosed is a dental material comprising a sulfur containing unsaturated carboxylic acid ester compound having a substituent containing a sulfur atom and at least two (meth)acrylic acid residues through an oxygen atom bonded to a secondary or tertiary carbon atom, specifically, a dental material comprising a polymerizable monomer (A) represented by the following formula (1):
 wherein R11 is a divalent organic group, X11 is an oxygen atom, a sulfur atom, -COO- group or -(CH2)qX12- group (X12 is an oxygen atom or a sulfur atom, and q is an integer of 1 to 3), R12 is a hydrogen atom or an alkyl group, R13 is a substituent containing a sulfur atom, and R14 is a hydrogen atom or a methyl group,
   or a dental material comprising a polymerizable monomer (A) which is liquid at ordinary temperature and has a viscosity of 100 to 1,000,000 cps. Also disclosed is a dental composition comprising the polymerizable monomer (A), a polymerization initiator (B) and a filler (C). The dental material and the dental composition are excellent in X-ray opacity, transparency, curability and stain resistance, and they have small polymerization shrinkage.
                            本发明公开了一种牙科材料,该材料由含
硫不饱和
羧酸酯化合物组成,该化合物具有一个含有
硫原子的取代基和至少两个通过与二级或三级碳原子键合的氧原子的(甲基)
丙烯酸残基,具体地说,该牙科材料由下式(1)代表的可聚合单体(A)组成:
 其中 R11 是二价有机基团,X11 是氧原子、
硫原子、-COO- 基团或-(
CH2)qX12- 基团(X12 是氧原子或
硫原子,q 是 1 至 3 的整数),R12 是氢原子或烷基,R13 是含有
硫原子的取代基,R14 是氢原子或甲基、
或包含可聚合单体(A)的牙科材料,该单体在常温下为液态,粘度为 100 至 1,000,000 cps。此外,还公开了一种牙科组合物,由可聚合单体(A)、聚合
引发剂(B)和填料(C)组成。该牙科材料和牙科组合物在 X 射线不透明度、透明性、固化性和抗污性方面都非常出色,而且它们的聚合收缩率很小。