Gong X, Zhao X Y, Zhang C B, Li S B, Wu Y L, Wu B
Department of Dental Materials, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Xi'an 710032, China.
Department of Laboratory Center, School of Stomatology, The Fourth Military Medical University & State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Xi'an 710032, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2017 Jul 9;52(7):439-442. doi: 10.3760/cma.j.issn.1002-0098.2017.07.009.
To evaluate the effect of sandblasting on bending strength and subcritical crack growth (SCG) under cyclic loading of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramics. After being polished, sixty bar-shaped specimens of Y-TZP (Wieland zirconia ceramics) were assigned to two groups (30) according to the random number table, the sandblasting group (SG) which was treated with sandblasting and the control group (CG) which remained untouched. In each group, half of the specimens (15) were subjected to bending strength test, and the results were examined by Weibull statistics and analyzed with ANOVA. The other 15 specimens in each group were subjected to fatigue tests. The results were examined by Weibull statistics and subcritical crack propagation rates were calculated. The bending strengths of SG and CG were (1 291±133) and (1 140±124) MPa (10.117, 0.004), and the Weibull modules of the two groups were 11.06 and 10.64 respectively. The crack growth rate of SCG of SG was lower than that of CG under the same cyclic loading. Proper sandblasting on Y-TZP ceramic can increase its bending strength and resistance to SCG.
为评估喷砂处理对钇稳定四方多晶氧化锆（Y-TZP）陶瓷在循环加载下的弯曲强度和亚临界裂纹扩展（SCG）的影响。将60个经过抛光的Y-TZP（威兰德氧化锆陶瓷）棒状试样根据随机数表分为两组（每组30个），即喷砂处理组（SG）和未处理的对照组（CG）。每组中，一半试样（15个）进行弯曲强度测试，结果采用威布尔统计进行检验并通过方差分析进行分析。每组中的另外15个试样进行疲劳测试。结果采用威布尔统计进行检验并计算亚临界裂纹扩展速率。SG组和CG组的弯曲强度分别为（1291±133）和（1140±124）MPa（F = 10.117，P = 0.004），两组的威布尔模量分别为11.06和10.64。在相同循环加载条件下，SG组的SCG裂纹扩展速率低于CG组。对Y-TZP陶瓷进行适当的喷砂处理可提高其弯曲强度和抗SCG能力。
