A photocurable dental restorative comprising (i) 100 parts by weight of a polymerizable monomer, (ii) 0.01 to 5 parts by weight of a photopolymerization initiator of acylphosphine oxide, and (iii) 200 to 1900 parts by weight of an inorganic filler, wherein the inorganic filler (iii) is a mixed filler of:
(A) irregular-shaped inorganic particles having an average particle size of not smaller than 0.1 &mgr;m but smaller than 1 &mgr;m;
(B) spherical inorganic particles having an average primary particle size of not smaller than 0.1 &mgr;m but not larger than 5 &mgr;m; and
(C) fine inorganic particles having an average primary particle size of not larger than 0.1 &mgr;m;
which are so blended as to satisfy the following mass ratios circle over (1)} to circle over (3)}:
mA
/(
mB+mC
)=0.2 to 3 circle over (1)}
mB
/(
mB+mC
)=0.5 to 0.99 circle over (2)}
mC
/(
mB+mC
)=0.01 to 0.5 circle over (3)}
where mA, mB and mC are masses of the inorganic particles (A) to (C).
The restorative features excellent handling property, and makes it possible to obtain a cured product having a high fracture toughness and excellently glossy surface.
一种光固化牙科修复材料,包括(i)100份重量的可聚合单体,(ii)0.01至5份重量的酰基膦氧化物光聚合
引发剂,和(iii)200至1900份重量的无机填料,其中无机填料(iii)是以下混合填料:(A)具有平均粒径不小于0.1μm但小于1μm的不规则形状无机颗粒;(B)具有平均初级粒径不小于0.1μm但不大于5μm的球形无机颗粒;和(C)具有平均初级粒径不大于0.1μm的细微无机颗粒;这些颗粒混合以满足以下质量比圆圈1}至圆圈3}:mA/(mB+mC)=0.2至3;mB/(mB+mC)=0.5至0.99;mC/(mB+mC)=0.01至0.5;其中mA、mB和mC分别为无机颗粒(A)至(C)的质量。该修复材料具有出色的操作性能,可以获得具有高断裂韧性和极佳光泽表面的固化产品。