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在人工唾液润滑条件下,利用销—盘磨损试验机研究了齿科二硅酸锂玻璃陶瓷的滑动磨损行为.结果表明:二硅酸锂玻璃陶瓷的磨损过程呈现显著的跑合磨损期,且跑合期的磨损率远大于稳定磨损期的磨损率;减小原始表面粗糙度可缩短跑合期,降低跑合期的磨损率.在二硅酸锂玻璃陶瓷的显微组织中,虽然二硅酸锂晶体相比玻璃基体具有更高的硬度,但在跑合磨损期却更容易发生剥落磨损,造成跑合期磨损表面粗糙度的显著变化,这种现象可能与二硅酸锂晶体具有较低的弹性断裂应变能力(H/E比值)有关.
The sliding wear behavior of dental lithium disilicate glass ceramics was studied by using a pin-plate wear tester under the condition of artificial saliva lubrication.The results showed that the wear process of lithium disilicate glass ceramics presented a significant running-wear period The wear rate of running-in period is far greater than the wear rate in steady-state wear stage.Improving the original surface roughness can shorten the running-in period and reduce the running-in wear rate.In the microstructure of lithium disilicate glass-ceramic, Lithium silicate crystals have higher hardness than glass substrates, but they are more prone to flaking and abrasion during running-in and wear-out period, resulting in significant changes of wear surface roughness during running-in. This phenomenon may be related to lithium disilicate crystals Lower elastic strain at break (H / E ratio).