【摘要】 目的 :研究纳米SiO2 颗粒对聚甲基丙烯酸甲酯 (PMMA)基托的增强增韧改变。方法 :利用原位聚合的方法将纳米SiO2 颗粒加入甲基丙烯酸甲酯 (MMA)单体中制成不同浓度的 (PMMA/SiO2)纳米义齿基托复合材料。对各组基托材料的抗弯强度、拉伸强度等指标进行分类比较 ,并对结果进行统计分析。结果 :添加纳米SiO2 颗粒浓度为0.25g ‰ml的 (PMMA/SiO2)义齿基托复合材料与普通PMMA义齿基托材料之间比较 ,其抗弯强度和拉伸强度提高无显著性差异(P>0.05)。而添加纳米SiO2 颗粒浓度为0.50g‰ml、0.75g‰ml、1.00g‰ml、的PMMA/SiO2 义齿基托复合材料与普通PMMA义齿基托材料相比 ,其抗弯强度和拉伸强度均有所提高(P<0.05)。结论 :在聚甲基丙烯酸甲酯 (PMMA)基托中加入一定浓度的纳米SiO2 颗粒可以提高传统义齿基托的抗弯强度和拉伸强度更多还原

【Abstract】 Objective:To study the improvement of strength and toughness by add SiO 2 nanometer grain to PMMA base plate.Methods:Using Insitu polymerization method,add SiO 2 nanometer grain to MMA and finally prepare different concentration of(PMMA/SiO 2 )nanometer composite material of denture base plate.To classify and compare the data of bendˉing strength and tension strength of the base plate material.Proper statistic method has been adopted to analyze the data.Results:The result shows that the bending strength and tension strength of(PMMA/SiO 2 )denture base plate material(0.25g‰mlSiO 2 )group is not obviously changing than normal group(P>0.05).But the bending strength and tension strength of(PMMA/SiO 2 )denture base plate material(0.50g‰ml?0.75g‰ml?1.00g‰ml SiO 2 )group are obviously improving than normal group(P<0.05).Conclusion:The bending strength and tension strength can be improved than traditional denture base plate by add SiO 2 nanometer grain to PMMA.更多还原