Survival-rate analysis of surface treated dental zirconia (Y-TZP) ceramics
Survival-rate analysis of surface treated dental zirconia (Y-TZP) ceramics
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DOI：
10.1007/s10856-014-5217-1
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发表时间：
2014-04
期刊：
影响因子：
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通讯作者：
Č. Oblak;I. Verdenik;M. Swain;T. Kosmač
中科院分区：
文献类型：
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作者：
Č. Oblak;I. Verdenik;M. Swain;T. Kosmač
研究了表面处理、水热老化暴露和随后的循环疲劳测试对牙科 Y-TZP 材料双轴强度的作用。研究发现，牙科 Y-TZP 陶瓷材料的初始强度和疲劳测试存活率高度依赖于表面处理，而不是暴露于各种水热暴露条件下。结果表明，由表面损伤（尤其是喷砂）和较小程度的热液暴露产生的单斜相似乎确实减轻了强度和疲劳退化。结果根据各种表面处理后产生的缺陷尺寸以及循环疲劳引起的裂纹扩展的作用进行了讨论。在单调强度和疲劳应力生存之间建立了临界比率。根据循环后失效并表现出强度降低的样品，建立了平均裂纹扩展速率与最大循环应力强度因子的关系图，该图与 Y-TZP 陶瓷的现有结果密切匹配。
The role of surface preparation, hydrothermal ageing exposure and subsequent cyclic fatigue testing on the biaxial strength of a dental Y-TZP material are investigated. The initial strength and survival rate of a dental Y-TZP ceramic material to fatigue testing was found to be highly dependent upon surface preparation more so than exposure to various hydrothermal exposure conditions. The results suggest that the monoclinic phase generated by either surface damage (especially sandblasting) and to a lesser extent hydrothermal exposure does appear to mitigate strength and fatigue degradation. The results are discussed in terms of the size of defects generated following various surface treatments and the role of cyclic fatigue induced crack growth. A critical ratio is established between the monotonic strength and fatigue stress survival. From the specimens that failed and exhibited reduced strength after cycling a plot of averaged crack growth rate versus max cyclic stress intensity factor was established which closely matched existing results for Y-TZP ceramics.