自凝与热凝树脂义齿材料摩擦磨损行为对比

在自制的往复摩擦磨损实验台上,以球面接触方式,在干摩擦、法向压力为20N、往复频率为0.5Hz、摆幅85mm条件下,研究了牙科用的自凝和热凝树脂球分别对自凝树脂板的摩擦磨损行为.实验过程中利用动态应变仪测量摩擦过程中应变片的应变,进而计算出摩擦系数.结合电镜观察比较得出了自凝与热凝2种义齿材料的耐磨性能:自凝树脂义齿材料磨损过程中会出现材料塑性流动和表面致密的光滑层,磨损轻微,后者材料致密性差有气孔,磨损过程中出现层状磨损,气孔周围材料易脱落,结果自凝材料的摩擦系数低于热凝材料,且耐磨性高于热凝材料.

Comparison of friction and wear characteristic of self-solidification and thermal coagulation resin denture material

By using a reciprocating sliding wear test machine,friction and wear characteristic of two types of dental resin were investigated and compared under the dry friction condition.A normal force of 20N,reciprocating amplitude 85mm and frequency of 0.5 Hz were used for all the wear tests.The contact was in a ball-on-flat,the ball was self-solidification resin and thermal coagulation resin,the flat was self-solidification resin.By using dynamic strain instrument measure the strain of strain gauge,and then calculated the friction coefficient.Through the analysis of friction coefficient,wear loss and electron micrograph observation get the wear-resisting performance of the two kinds of materials.Through the observation of electron micrograph,the self-solidification resin denture material emerged plastic flow and surface smooth layer on surface in the process of wear,its wear loss was light.The compactness of the thermal coagulation resin denture was bad,the layer wear was obvious and the material of pores around was easy to fall off,so the friction coefficient of self-solidification resin denture material was less than that of thermal coagulation resin denture material,and the wear-resisting performance showed the opposite.