甲基丙烯酸偶联二氧化钛/PMMA基托树脂的机械性能

目的研究甲基丙烯酸偶联二氧化钛对树脂基托材料的机械性能的影响。方法按质量比2%、4%、6%及偶联剂有无添加在2种树脂基托材料中,检测各组试件的弯曲强度、弯曲弹性模量、挠度和冲击强度,并用扫描电镜观察表面结构的差异,分析添加量以及偶联剂对树脂基托材料机械性能的影响。采用SPSS12.0软件对数据进行统计学处理。结果弯曲强度和冲击强度随着二氧化钛添加量增加而下降,偶联剂能减缓下降量,偶联剂对弯曲弹性模量和挠度有显著影响(P<0.05)。日进MTi4%的弯曲强度(154.22Mpa)、冲击强度(12.50kJ/m2)和弯曲弹性模量(3643.72Mpa)分别显著大于日进TiO24%(P<0.05)。结论二氧化钛会降低基托树脂的机械性能,甲基丙烯酸能减缓其下降幅度。

Mechanical poperties of methacrylic acid coupled TiO2/PMMA denture base resin

Objective To study the influence of TiO2 and methacrylic acid on mechanical properties of denture base resin.Methods TiO2(2%、4%、6%) and methacrylic acid were respectively added into two makers’denture base resins.The mechanical properties such as flexure strength、flexure modulus、 deflection and impact strength were measured.SEM analysis was conducted to examine the surface microstructure.The data were analysed by SPSS 12.0 software package of two-way ANOVA.Results The flexure strength and impact strength of samples decreased as TiO2 increased.Methacrylic acid had a significant influence on the flexure modulus of and deflection.The flexure strength,flexure modulus and impact strength of MTi4%(Rijin) were respectively 154.22Mpa,12.50kJ/m2 and 3643.72Mpa significantly larger than those of Ti 4%.Conclusion Addition of TiO2 reduced the mechanical properties of denture base resin.Methacrylic acid could minimize the influence on the mechanical properties of TiO2/PMMAdenture base resin.