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为改善常规口腔义齿基托材料聚甲基丙烯酸甲酯(Polymethyl methacrylate,PMMA)的低硬度、低亲水性以及低耐磨性等,本文中以PMMA为基体、氧化石墨烯(Graphene oxide,GO)为增强填料,借助液相超声-高速球磨分散技术将两种粉末均匀混合后,采用常规义齿基托加工法制备GO增强型义齿基托复合材料.采用高分辨扫描电子显微镜、维氏显微硬度计和光学接触角测量仪分别对复合材料显微结构、表面显微硬度及其亲水性能进行观察和评价;在人工唾液润滑环境下,采用UMT-3MT往复式摩擦磨损试验机和三维表面轮廓仪对复合材料耐磨性能及表面磨痕形貌进行评价和观察.结果表明:随着增强填料GO的加入,复合材料的显微硬度呈现先快速增加后逐渐变缓的趋势;复合材料表面水静态接触角则呈现逐渐降低的趋势;当GO质量百分数小于0.1%时,复合材料的摩擦系数和磨损率均低于常规口腔义齿基托材料,而GO质量百分数大于0.1%时其摩擦系数和磨损率呈升高趋势.GO的添加提高了常规义齿基托材料PMMA的硬度、亲水性和耐磨性能,显示出了良好的应用潜能.
In order to improve the low hardness, low hydrophilicity and low wear resistance of conventional oral denture base material, PMMA as matrix, Graphene oxide (GO) ) In order to reinforce the filler, the GO-reinforced denture base composite was prepared by the conventional denture base treatment by means of liquid-phase ultrasonic-high speed ball milling and dispersion technique.Using high resolution scanning electron microscopy, The hardness and the hydrophilicity of the composites were observed and evaluated by using the hardness meter and the optical contact angle measuring instrument respectively. In the artificial saliva lubrication environment, the UMT-3MT reciprocating friction and wear tester and the three-dimensional surface The results showed that the microhardness of the composites tended to increase slowly and then gradually decreased with the addition of GO. The surface of the composites The static contact angle of water shows a trend of decreasing gradually. When the mass percentage of GO is less than 0.1%, the friction coefficient and wear rate of the composite material are lower than the conventional oral sense The friction coefficient and wear rate of GO material increased with the mass percent of GO greater than 0.1% .The addition of GO increased the hardness, hydrophilicity and wear resistance of conventional denture base material PMMA, and showed good Apply potential.