Compomer的摩擦磨损特性

Friction and wear characteristics of dental Compomers

采用Compoglass,F2 0 0 0 ,Elan ,DyractAP 4种牙科用复合体材料 (Compomer) ,对其玻璃颗粒含量和表面硬度进行了测量 ,并在球 盘往复摩擦磨损试验机上考察了它们的摩擦磨损特性 .结果表明 :F2 0 0 0的摩擦系数最高 ,Elan的摩擦系数次之 ,Compoglass和DyractAP的摩擦系数分别为第三和第四 .摩擦系数随玻璃颗粒含量的增加而增加 .在同样试验条件下 ,低摩擦系数的DyractAP和Compoglass与高摩擦系数的F2 0 0 0和Elan相比具有较好的耐磨性 .磨损机理主要表现为由玻璃颗粒脆性断裂引起的玻璃颗粒脱落和磨粒磨损 .

The friction and wear characteristics and wear mechanisms of dental Compomers were investigated. Compomers such as Compoglass,F2000,Elan and Dyract AP were selected as specimens. Surface characteristics was examined by SEM and contents of glass fillers in specimens were determinated in order to analyze the effect of the fillers on friction and wear characteristics. Ball on flat wear tester was used for a wear test. (Friction) and wear tests are carried out at room temperature. The friction coefficient of F2000 was quite high (relatively,) and the wear resistance of Compoglass and Dyract AP was better than that of F2000 and other specimens at the same experimental condition. The main wear mechanism is brittle fatigue of glass fillers, plastic flow and abrasive wear by crack propagation.