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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Lifetime of alumina- and zirconia ceramics used for crown and bridge restorations.
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Lifetime of alumina- and zirconia ceramics used for crown and bridge restorations.

机译：用于牙冠和牙桥修复体的氧化铝和氧化锆陶瓷的使用寿命。

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The lifetime of a ceramic is dependent on the presence of incidental cracks and their gradual propagation under the conditions of the oral cavity. The objective of this study was to examine the long-term strength of glass-infiltrated alumina- and various zirconia ceramics currently used in CAD/CAM systems to manufacture crown and bridge frameworks. Fracture mechanics were applied to determine characteristic strength (sigma(omicron)), Weibull modulus (m), fracture toughness (K(Ic)), and the subcritical crack growth parameters n and B. Based on these parameters, lifetime diagrams were generated which allowed the evaluation of the long-term behavior. The results showed that in a moist environment, the glass-infiltrated alumina- and some zirconia ceramics have a high susceptibility to subcritical crack growth. Zirconia ceramics with an alumina oxide content of 0.25 wt %, however, exhibited the highest initial and most favorable long-term strength, and should therefore be suitable for crown and bridge restorations.
机译：陶瓷的寿命取决于在口腔条件下偶然出现的裂纹及其逐渐扩散。这项研究的目的是检查玻璃渗透的氧化铝和各种氧化锆陶瓷的长期强度，这些陶瓷目前在CAD / CAM系统中用于制造牙冠和牙桥框架。应用断裂力学来确定特征强度（σ），威布尔模量（m），断裂韧性（K（Ic））以及亚临界裂纹扩展参数n和B。基于这些参数，生成了寿命图，该寿命图可以评估长期行为。结果表明，在潮湿的环境中，玻璃渗透的氧化铝陶瓷和某些氧化锆陶瓷对亚临界裂纹的生长具有很高的敏感性。然而，氧化铝含量为0.25wt％的氧化锆陶瓷表现出最高的初始和最有利的长期强度，因此应该适合于牙冠和牙桥修复体。

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