Hirasawa T, Hirano S, Hirabayashi S, Harashima I, Nasu I, Kurosawa T
Shika Rikogaku Zasshi. 1981 Apr;22(59):187-95.
The various mechanical properties of seven microfilled composite resins were evaluated, comparing with two conventional composite resins. The following results were obtained. 1) Though microfilled composite resins were more excellent than conventional ones on surface roughness after polishing or brushing, but they were inferior to conventional ones on the resistance to brushing abrasion. 2) Tensile, compressive and bending strength were dependent on inorganic filler content and properties of matrix resin. Particularly, their mechanical properties in the wet condition were strongly influenced by whether matrix resin was hydrophilic or hydrophobic. Compared with conventional composite resins, microfilled ones contained 30 to 40 wt% of filler had lower values of tensile and bending strength, and near values of compressive strength. While, microfilled ones contained 50 to 60 wt% of filler had higher values of compressive strength, and near values of tensile and bending strength, compared to conventional ones. 3) Modulus of elasticity and hardness were mainly dependent on inorganic filler content. Moduli of elasticity of microfilled composite resins were about 25 to 33% of them of conventional ones, and hardnesses of microfilled ones were approximately 50% of them of conventional ones except some materials. Hardnesses of microfilled composite resins with 50 to 60 wt% of filler were similar to them of conventional ones.
评估了七种微填料复合树脂的各种机械性能，并与两种传统复合树脂进行了比较。得到了以下结果。1）尽管微填料复合树脂在抛光或刷牙后的表面粗糙度方面比传统复合树脂更优异，但在耐刷牙磨损性方面却不如传统复合树脂。2）拉伸、压缩和弯曲强度取决于无机填料含量和基体树脂的性能。特别是，它们在潮湿条件下的机械性能受基体树脂是亲水性还是疏水性的强烈影响。与传统复合树脂相比，填料含量为30至40 wt%的微填料复合树脂的拉伸和弯曲强度值较低，压缩强度值相近。而填料含量为50至60 wt%的微填料复合树脂与传统复合树脂相比，压缩强度值较高，拉伸和弯曲强度值相近。3）弹性模量和硬度主要取决于无机填料含量。微填料复合树脂的弹性模量约为传统复合树脂的25%至33%，除某些材料外，微填料复合树脂的硬度约为传统复合树脂的50%。填料含量为50至60 wt%的微填料复合树脂的硬度与传统复合树脂相似。
