The effect of surface grinding and sandblasting on flexural strength and reliability of Y-TZP zirconia ceramic
The effect of surface grinding and sandblasting on flexural strength and reliability of Y-TZP zirconia ceramic
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DOI：
10.1016/s0109-5641(99)00070-6
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发表时间：
1999-11-01
期刊：
影响因子：
5
通讯作者：
Marion, L
中科院分区：
文献类型：
--
作者：
Kosmac, T;Oblak, C;Marion, L
目的：研究了研磨和喷砂处理对两种Y-TZP陶瓷显微结构、双轴弯曲强度和可靠性的影响。将每种材料的60个椎间盘随机分为6组，每组10个。对于每组，应用不同的表面处理：干磨、湿磨、喷砂、干磨+喷砂、喷砂+干磨和对照组。测定双轴弯曲强度，并使用单因素ANOVA分析数据，然后进行Tukey's HSD检验（p < 0.05）。此外，使用威布尔统计分析弯曲强度的变异性。结果：细晶和粗晶Y-TZP的平均强度无明显差异。无论是湿磨还是干磨，对照组与细磨组之间均存在显著性差异（p < 0.05）。喷砂显著提高了细晶粒和粗晶粒材料的强度。所有的表面处理程序降低了Y-TZP的威布尔模量。对于这两种材料，最高量的单斜相和最大的TZD被发现后喷砂较低量的单斜相后得到的两个研磨程序，其中最高的平均临界缺陷尺寸c（铬）也calculated.Significance：我们的研究结果表明，喷砂可以提供一个强大的技术，用于加强Y-TZP在临床实践中。相比之下，研磨可能导致预制氧化锆元件的强度显著降低和可靠性降低，因此建议对研磨表面进行喷砂处理。(C)1999年牙科材料学院。由Elsevier Science Ltd.出版，版权所有。
Objectives: This study was conducted to evaluate the effect of grinding and sandblasting on the microstructure, biaxial flexural strength and reliability of two yttria stabilized tetragonal zirconia (Y-TZP) ceramics.Methods: Two Y-TZP powders were used to produce fine grained and coarse grained microstructures. Sixty discs from each material were randomly divided into six groups of ten. For each group, a different surface treatment was applied: dry grinding, wet grinding, sandblasting, dry grinding + sandblasting, sandblasting + dry grinding and a control group. Biaxial flexural strength was determined and data were analyzed using one-way ANOVA, followed by Tukey's HSD test (p < 0.05). In addition, Weibull statistics was used to analyze the variability of flexural strength. The relative amount of transformed monoclinic zirconia, corresponding transformed zone depth (TZD) and the mean critical defect size c(cr) were calculated.Results: There was no difference in mean strength between the as sintered fine and coarse grained Y-TZP. Significant differences (p < 0.05) were found between the control group and ground fine grained material for both wet and dry grinding. Sandblasting significantly increased the strength in fine and coarse grained materials. All surface treatment procedures reduced the Weibull modulus of Y-TZP. For both materials, the highest amount of the monoclinic phase and the largest TZD was found after sandblasting Lower amounts of the monoclinic phase were obtained after both grinding procedures, where the highest mean critical defect size c(cr) was also calculated.Significance: Our results indicate that sandblasting may provide a powerful technique for strengthening Y-TZP in clinical practice. In contrast, grinding may lead to substantial strength degradation and reduced reliability of prefabricated zirconia elements, therefore, sandblasting of ground surfaces is suggested. (C) 1999 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.