一种新透明Y-TZP陶瓷低温老化后的机械性能评价

›› 2020, Vol. 40 ›› Issue (4): 304-308.

一种新透明Y-TZP陶瓷低温老化后的机械性能评价

沈佳娣¹,谢海峰¹,何峰²,陈晨³

1. 南京医科大学
2. 江苏省口腔医院
3. 南京医科大学附属口腔医院

收稿日期:2019-10-10 修回日期:2020-01-03 出版日期:2020-04-28 发布日期:2020-04-28
通讯作者: 陈晨 E-mail:ccchicy@njmu.edu.cn
基金资助:
国家自然科学基金;江苏省自然科学基金;江苏高校青蓝工程;江苏高校优势学科建设工程资助项目

Evaluation of the mechanical properties of a novel transparent Y-TZP ceramic product after low-temperature degradation

Received:2019-10-10 Revised:2020-01-03 Online:2020-04-28 Published:2020-04-28

摘要/Abstract

摘要： 目的　评价体外模拟低温老化对一种新透明Y-TZP陶瓷产品弯曲强度的影响，并进行相应的威布尔分析。方法　制备16枚透明Y-TZP陶瓷Katana UTML (KU)试件，以市场常用的透明Y-TZP产品Lava Plus (LP)为对照。将制备的试件按以下方法模拟低温老化：温度134℃、压力0.2MPa的高压灭菌锅内持续20小时。使用万能测试机测试老化前、后试件的弯曲强度，对弯曲强度的数值进行Weibull分析。此外，对两种氧化锆陶瓷在老化前后分别进行扫描电子显微镜（SEM）分析，以观察老化前后的表面微观结构的变化。结果　KU在老化前后的弯曲强度无统计学差异，但明显低于LP；Weibull分析结果发现，KU的Weibull模量(m)在老化后提高，而LP的m值在老化后发生了降低。扫描电镜结果发现，KU老化前后的表面微观形态未发生明显变化；而LP老化后晶粒的连续性发生了破坏。结论　老化对新透明Y-TZP陶瓷产品KU的弯曲强度并未产生不利影响，相比于LP而言，老化也未造成KU的可靠性和结构完整性降低，说明KU具有更好的耐低温老化性能。

关键词: 氧化锆陶瓷, 低温老化, 弯曲强度, Weibull分析

Abstract: Objective　To evaluate the effect of aging in vitro on the flexural strength of a novel transparent Y-TZP ceramic product and Weibull analysis. Methods　Sixteen transparent Y-TZP ceramic Katana UTML (KU) specimens were prepared and Lava Plus (LP) was selected as the control group, a transparent Y-TZP product commonly used in the dental market. The specimens were subjected to hydrothermal aging treatment according to the following methods: in an autoclave at 134℃ under 0.2MPa for 20h. The flexural strength of the samples before and after aging was tested by a universal tester, and then the value of flexural strength was analyzed by Weibull analysis. Besides, Scanning electron microscope (SEM) was applied to analyze the surface microstructure of the two zirconia ceramics before and after aging. Results　There was no significant difference in the flexural strength of KU before and after aging, but it was significantly lower than that of LP. The results of Weibull analysis showed that the Weibull modulus (m) of KU increased after aging, while the m value of LP decreased. The results of SEM showed that there was no significant changes on the surface morphology of KU after aging, while the grain continuity of LP was destroyed. Conclusions　Aging in vitro had no adverse effect on the flexural strength of the novel transparent Y-TZP ceramic product KU. Compared with LP, hydrothermal aging treatment didn’t reduce the reliability and structural integrity of KU, which indicated that KU has a better aging resistance than LP.

Key words: zirconia ceramic, low-temperature degradation, flexural strength, Weibull analysis

沈佳娣谢海峰何峰陈晨. 一种新透明Y-TZP陶瓷低温老化后的机械性能评价[J]. 口腔医学, 2020, 40(4): 304-308.

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