Influence of sintering conditions on translucency, biaxial flexural strength, microstructure, and low-temperature degradation of highly translucent dental zirconia
Influence of sintering conditions on translucency, biaxial flexural strength, microstructure, and low-temperature degradation of highly translucent dental zirconia
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DOI：
10.4012/dmj.2020-448
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发表时间：
2021-12-01
影响因子：
2.5
通讯作者：
Minakuchi, Shunsuke
中科院分区：
文献类型：
--
作者：
Di Cho Too, Thaw;Inokoshi, Masanao;Minakuchi, Shunsuke
关于不同烧成温度对高透明氧化锆瓷性能影响的研究较少。研究了不同烧成温度对三种高透明氧化锆(3Y-TZP、4Y-PSZ和5Y-PSZ)半透明性、晶体结构、双向抗折强度、显微结构和低温降解性能的影响。用比色法、X射线衍射、扫描电子显微镜、威布尔分析和LTD试验(134摄氏度；20h)对样品进行了表征。提高烧结温度对3Y-TZP的半透明性没有影响，但增加了4Y-PSZ和5Y-PSZ的半透明性。随着烧成温度的升高，所有氧化锆级均表现出颗粒增大，双向抗折强度不变。在1600℃的烧结温度下，3Y-TZP和4Y-PSZ的降解速度最快。
There is limited research on the influence of different sintering temperatures on the properties of highly translucent zirconia ceramics. This study demonstrated the influence of different sintering temperatures on the translucency, crystallographic structure, biaxial flexural strength, microstructure, and low-temperature degradation (LTD) of three highly translucent zirconia grades, i.e., 3 mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP), 4 mol% yttria-partially-stabilized zirconia (4Y-PSZ), and 5 mol% yttria-PSZ (5Y-PSZ). The specimens were characterized using colorimetry, X-ray diffraction, scanning electron microscopy, Weibull analysis, and LTD tests (134 degrees C; 20 h). The increase in the sintering temperature did not affect the translucency of 3Y-TZP, whereas it increased the translucencies of 4Y-PSZ and 5Y-PSZ. All the zirconia grades exhibited grain enlargement and unchanged biaxial flexural strengths with the increase in the sintering temperature. The degradation of 3Y-TZP and 4Y-PSZ at a sintering temperature of 1,600 degrees C was faster than that at other sintering temperatures.