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牙科用氧化锆陶瓷由于其良好的力学性能、高温稳定性、生物安全性和低热传导率,现已广泛应用于临床,特别是后牙全冠及固定桥修复。然而,在相对较低的温度及潮湿的环境下,氧化锆发生由部分稳定的四方晶相向单斜晶向的改变,即低温时效现象,影响其力学性能。本文探讨了牙科用氧化锆的低温时效及其影响因素,并讨论了改善其抗低温时效性的途径。
Dental zirconia ceramics have been widely used in clinic, especially for the restoration of posterior teeth full crown and fixed bridge because of their good mechanical properties, high temperature stability, biological safety and low thermal conductivity. However, at relatively low temperature and humid environment, zirconia changes from a partially stabilized tetragonal phase to a monoclinic phase, that is, the low temperature aging phenomenon, which affects its mechanical properties. This article explores the low temperature aging of dental zirconia and its influencing factors, and discusses ways to improve its low temperature aging.