SiO_2粒径分布对牙科复合树脂性能影响  

Influences of silica size distribution on the performance of dental composite

作　　者：朱苞蕾[1] 朱墨[1] 王芮莉[1] 张青红[1] 孙宾[1] 孙皎[2] 朱美芳[1] 

机构地区：[1]东华大学材料学院,上海201620 [2]上海交通大学医学院附属第九人民医院,上海201000

出　　处：《口腔材料器械杂志》2011年第1期10-14,共5页Chinese Journal of Dental Materials and Devices

基　　金：上海市纳米科技专项(0952nm05600)

摘　　要：目的研究SiO2粒径分布对牙科复合树脂无机填料的填充量和物理机械性能的影响。方法采用经硅烷表面修饰的气相法纳米SiO2(NS)和微米SiO2(MS),通过调整两者相对质量比,与双酚A双甲氧基缩水甘油酯牙科树脂单体共混,制备了一系列牙科复合树脂M50N20,M55N15,M58N12,M60N10,M63N07,研究了不同SiO2粒径分布对无机填料的填充量,以及复合树脂维氏硬度、三点弯曲强度和断面形貌的影响。结果复合树脂中填料的填充量取决于无机填料的分布及比表面大小,当MS/NS=58/12时,复合树脂的无机填料填充量达到84wt%。M58N12表现出最高的三点弯曲强度(153.2MPa)以及维氏硬度(102.3MPa)。复合树脂断面的SEM形貌分析表明,纳米SiO2与复合树脂基体有较好的粘合作用。结论复合树脂中SiO2粒径分布对物理机械性能以及无机填料的填充量有较显著的影响。Objective The Purpose of this study was to evaluate the influence of the size distribution of the inorganic filler on the performance of the experimental dental composite.Methods Mixture of surface modified micro silica（MS） and nano silica（NS） with different weight ratio were used as the inorganic filler.A series of experimental dental composite with different filler size distribution were obtained by mixing processing of the inorganic filler with dental monomer,and were named as M50N20,M55N15,M58N12,M60N10,M63N07.The relationship of filler size distribtution and filler loading was studied.Three point bending,Vickel＇s hardness tests were employed to study the filler size distribution on the mechanical properties of the experimental dental composite.Scanning electronic microscopy was employed for the morphology analysis for the cross section of the composite.Results It was found that the filler loading mainly denpends on the surface area and the compact density of the silica filler,the composite with 58/12 of MS/NS reached 84wt% filler loading.The mechanical tests showed that the filler distribution had obvious effects on the flexural strength and vicker hardness of the composite.Sample M58N12 reached the highest flexural strength（153.2 MPa） and vicker hardness（102.3MPa）.The morphology analysis with SEM on the composite showed that nano silica had better bonding with the resin matrix.Significance This study shows that the filler size distribution has a significant influence on the mechanical properties and filler loading of the dental composite.

关 键 词：牙科复合树脂 SiO2粒径分布 填料填充量 力学性能 形貌分析 

分 类 号：R783[医药卫生—口腔医学]