自制桩核树脂机械性能的比较研究

目的对比3种自制桩核树脂与3种双固化进口桩核树脂的机械性能。方法将纳米SiO2与玻璃粉作为填料，以3种比例分散于不同基质中，组1：SiO2填料直径为50nto，基质添加BisEMA6；组2：SiO：填料直径为12nm和50nm，基质添加BisEMA6；组3：SiO2填料直径为12nm和50nm，基质添加BisEMA。测定比较3组自制桩核树脂和3种双固化进口桩核树脂的挠曲强度、抗压强度、断裂面微观结构。结果自制组2、3的挠曲强度与3组双固化进口树脂无显著差异（P〉0．05），抗压强度高于后者（P〈0．05），断裂面微观结构与后者相似；自制组1挠曲强度、抗压强度较自制组2、3低（P〈0．05），断裂面微观结构不同。结论添加BisEMA、BisEMA6的基质分别与含有12nmSiO：的填料自行配制的纳米桩核树脂，挠曲强度达到进口树脂水平，抗压强度高于进口树脂水平。

Comparative study on mechanical properties of self-made core resin

Objective To compare the mechanical properties of several kinds of self-made core resin with imported core resin. Methods Nano-Si02 and glass powder were added to different organic matrix by various proportions, to develop 3 groups of nanocomposite core resin. Group 1 ： matrix with BisEMA6, Nano-SiO2 （diameter： 50nm） ; Group 2： matrix with BisEMA6, Nano-SiO2 （ diameters： 12nm and 50nm） ; Group 3： matrix with BisEMA, Nano-SiO2 （ diameters： 12nm and 50nm） .The flexural strength and compressive strength of self-made and imported resin were evaluated and compared. Results The flexural strength of group 2 and 3 was not significantly different with that of the imported core resin （P 〉 0. 05）, but the compressive strength was much higher in group 2 and 3 than in imported resin （P 〈 O. 05 ）. The flexural strength and compressive strength of group 1 was significantly lower than that of group 2 and 3. Conclusion The self-made core resin containing BisEMA, BisEMA6 and 12nm SiO2 presents as high flexural strength as the imported core resin but has higher compressive strength than imported core resin.