中文摘要：

目的：比较5种后牙复合树脂的耐磨耗性能,探讨影响耐磨耗性能的因素。方法：取Heliomolar HB（A）、Solitaire 2（B）、Filtek P60（C）、Ecusphere-Carat（D）、Tetric Ceram HB（E）5种后牙复合树脂和银汞合金（F）,制成磨耗试样,用显微硬度计测定其表面硬度后,分别置于V型牙科磨耗试验机上,以不锈钢球为对磨偶件、萤石粉为磨耗介质,在磨耗压力为3 N的条件下对试样摩擦6万次;然后,用三维形貌仪测定试样的体积磨损量和磨损面粗糙度,SEM观察其磨损表面形貌。

英文摘要：

AIM：To investigate the influencing factors on wear resistance of posterior composite resins. METHODS：The specimens for wear test were prepared respectively from Heliomolar HB（A）,Solitaire 2（B）,Filtek P60（C）,Ecusphere-Carat（D）,Tetric Ceram HB（E）and amalgam （F）.After surface micro-hardness test each specimen was brushed in a V-type dental wear testing machine for 60,000-times under a loading of 3 N and with stain-less-steel ball as the antagonist and fluorite powder as the grinding medium.Then the volume loss and wearing surface roughness of each specimen were measured using a three-dimensional optical profilometer and the wearing surface was observed under SEM.RESULTS：The volume loss ranked as follows：F〈C〈B≈E≈A〈D（P〈0.05 ）,and the hardness ranked as follows：A 〈B 〈D 〈E 〈C 〈F（P〈0.05）.The wearing surfaces of C and D were flatter and smoother,showing abrasive wear,whereas the wearing surfaces of A,B and E were rougher,showing fatigue wear. The wear loss of the composite resins and the surface roughness after wearing were negatively relevant to their hardness （P〈0.05）.CONCLUSION：The harder the composite resin is,the higher the wear resistance will be.The surface roughness decreases as the hardness increases.The composite containing more microfillers demonstrates more fatigue wear,while it demonstrates more abrasive wear when it contains less microfillers and more glass fillers.