冷热循环老化对可切削复合树脂表面粗糙度的影响

目的：研究冷热循环老化对可切削复合树脂材料粗糙度的影响。方法以可切削复合树脂A( Lava Ultimate ,3M ESPE)、B(High-Class, AMBORINO)、C(Hyramic 润瓷, Upcera)为实验组,以光固化复合树脂 D ( Ceramage, Shofu)和二硅酸锂玻璃陶瓷E( UP-CAD, Upcera)为对照组,分别在老化前和经5000及10000次冷热循环后测量表面粗糙度( Ra),并观察表面形貌,进行统计学分析。结果在老化前,D和E组间Ra值差异有统计学意义(P<0.05),其余各组间Ra值差异均无统计学意义。经冷热循环老化实验,A、B、C和E四组材料冷热循环前后材料表面粗糙度Ra值的差异均无统计学意义；D组材料冷热循环前后,材料表面粗糙度Ra值的差异有显著统计学意义(P<0.001)。结论经冷热循环老化后,可切削复合树脂和玻璃陶瓷表面粗糙度较为稳定,而光固化复合树脂粗糙度增加。

Effects of thermal cycling on surface roughness of dental CAD/CAM resin composites

Objective To investigate the influence of thermal cycling on surface roughness of different kinds of dental CAD/CAM resin composites. Methods Three kinds of CAD/CAM resin composite (3M ESPE Lava Ultimate, AMBORINO High-Class,Upcera Hyramic) , Shofu Ceramage and Upcera UP-CAD were included in this study. The surface roughness (Ra) of these five kinds of materials were determined before and after thermal cycling for 5,000 and 10,000 times respectively. The data were statistically analyzed. Results The Ra values of the three kinds of CAD/CAM resin composite and Upcera UP-CAD did not change after thermal cycling(P<0. 05), while the Ra value of Shofu Ceramage increased(P<0. 001). Conclusion The roughness of the CAD/CAM resin composite and ceramic material tested were stable after thermal cycling,while the roughness of light-cured resin composite increased.