St Germain H, Swartz M L, Phillips R W, Moore B K, Roberts T A
J Dent Res. 1985 Feb;64(2):155-60. doi: 10.1177/00220345850640021301.
Two series of composite resins were prepared with a light-cured urethane dimethacrylate matrix to which varying amounts of two types of silanated silica particles were added. One series contained volume fractions ranging from 15.8 to 28.8% silica particles of 20 nm in diameter (Type I filler) and the other series volume fractions of from 24 to 49.4% of an agglomerated silica particle of 40 nm in diameter (Type II filler). Tests were conducted to determine the effect of filler level on: depth of cure as determined by hardness measurements; color stability in both UV light and water; water sorption with time; hardness; compressive strength; strain behavior in slow compression; and resistance to toothbrush abrasion and wear by hydroxyapatite. Analysis of the data obtained for these two microfilled series indicate that increased filler levels result in trends for increased depth of cure, color stability, hardness, compressive strength, and stiffness, while water sorption and resistance to both toothbrush abrasion and wear by hydroxyapatite were reduced. These trends were more pronounced for the Type II filler series than for the Type I filler series. However, there was a greater differential in filler levels within the Type II series than within the Type I series.
制备了两组复合树脂，其采用光固化聚氨酯二甲基丙烯酸酯基体，并添加了不同量的两种硅烷化二氧化硅颗粒。一组含有体积分数为15.8%至28.8%的直径为20nm的二氧化硅颗粒（I型填料），另一组含有体积分数为24%至49.4%的直径为40nm的团聚二氧化硅颗粒（II型填料）。进行了多项测试，以确定填料含量对以下方面的影响：通过硬度测量确定的固化深度；在紫外线和水中的颜色稳定性；随时间的吸水率；硬度；抗压强度；慢压缩时的应变行为；以及抗牙刷磨损和羟基磷灰石磨损的能力。对这两组微填料系列所获得数据的分析表明，填料含量增加会导致固化深度、颜色稳定性、硬度、抗压强度和刚度增加的趋势，而吸水率以及抗牙刷磨损和羟基磷灰石磨损的能力则降低。这些趋势在II型填料系列中比在I型填料系列中更为明显。然而，II型系列内填料含量的差异比I型系列内的更大。
