中文摘要：

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.

英文摘要：

To make enhancement on high hardness, hydrophilieity and the wear resistance for denture base composite materials, polymethyl methacrylate （PMMA） and graphene oxide （GO） were mixed successfully by the step of liquidphase ultrasonication dispersion, high - speed ball mill mixing, and finally the samples of denture base reinforced with GO were processed according to the processing method of dental conventional method. The microstructure, micro - hardness andthe surface hydrophilic of the GO/PMMA composites were observed and evaluated by using a high - resolution scanning electron microscope, Vicker micro - hardness meter and the contact angle analysis apparatus. Under the lubrication of artificial saliva, the wear properties of the GO/PMMA composites were investigated using a reciprocating friction testing apparatus of UMT- 3MT. The surface topographies and their wear scratches of these composites were observed by Micro - XAM three - dimensional surface profile. The results show that compared with the routine denture base material, the micro - hardness of GO/PMMA composites increased with the increasing GO content. However, the trend became weaker when the addition amount of GO was greater than 0.1%. The static contact angle decreased gradually with the addition amount of GO. When the addition amount of GO was lower than 0.1% , the coefficient of friction and wear rate of these composites were lower than the control group, while the addition was higher than 0.1% , the results were reversed. The wear resistance of GO/PMMA composites were enhanced by the addition of the enhance filler of GO. The denture base material reinforced with GO shows good properties for dental clinical application.