In vitro lifetime of dental ceramics under cyclic loading in water
In vitro lifetime of dental ceramics under cyclic loading in water
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DOI：
10.1016/j.biomaterials.2006.12.033
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发表时间：
2007-06-01
期刊：
影响因子：
14
通讯作者：
Gauckler, L. J.
中科院分区：
文献类型：
--
作者：
Studart, A. R.;Filser, F.;Gauckler, L. J.
与传统的金属基修复体相比，全瓷修复体具有更好的美观性和生物相容性。然而，在水和循环载荷存在下的长期疲劳和亚临界裂纹增长会随着时间的推移降低陶瓷部件的强度。我们研究了三种牙科材料在水中的循环疲劳，这些牙科材料目前用作全瓷修复中的框架：3摩尔%氧化钇部分稳定的氧化锆（3 Y-TZP，Cercon，Degudent GmbH），Al 2 O3-ZrO 2-玻璃复合材料（Inceram-Zirconia，Vita Zahnfabrik GmbH）和Li（2）O（.）2SiO（2），玻璃陶瓷（Empress 2，Ivoclar Vivadent AG）。进行疲劳和快速断裂试验，以确定每个框架组件的寿命和初始机械强度的威布尔分布。尽管3 Y-TZP材料在水中易疲劳，但由于其初始机械强度高，因此特别适用于制备后牙全瓷桥。提供了在严重潮湿和循环载荷条件下使用寿命超过20年的全陶瓷后桥的材料选择和设计指南。(c)2007爱思唯尔有限公司版权所有。
All-ceramic dental restorations exhibit enhanced esthetics and biocompatibility as compared to traditional metal-based prosthesis. However, long-term fatigue and subcritical crack growth in the presence of water and cyclic loading can decrease the strength of ceramic components over time. We investigated the cyclic fatigue in water of three dental materials currently used as frameworks in all-ceramic restorations: a 3 mol%-yttria partially stabilized zirconia (3Y-TZP, Cercon, Degudent GmbH), a Al2O3-ZrO2-Glass composite (Inceram-Zirconia, Vita Zahnfabrik GmbH) and a Li(2)O(.)2SiO(2), glass ceramic (Empress 2, Ivoclar Vivadent AG). Fatigue and fast fracture tests were performed to determine the Weibull distribution of lifetime and initial mechanical strength for each framework component. In spite of its noticeable susceptibility to fatigue in water, the 3Y-TZP material was found to be particularly suitable for the preparation of posterior all-ceramic bridges due to its high initial mechanical strength. Guidelines are provided for the selection of materials and the design of all-ceramic posterior bridges exhibiting lifetime longer than 20 years under severe wet and cyclic loading conditions. (c) 2007 Elsevier Ltd. All rights reserved.