Fracture resistance of yttrium oxide partially-stabilized zirconia all-ceramic bridges after veneering and mechanical fatigue testing
Fracture resistance of yttrium oxide partially-stabilized zirconia all-ceramic bridges after veneering and mechanical fatigue testing
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DOI：
10.1016/j.dental.2004.07.013
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发表时间：
2005-05-01
期刊：
影响因子：
5
通讯作者：
Sjögren, G
中科院分区：
文献类型：
--
作者：
Sundh, A;Molin, M;Sjögren, G
目标.氧化钇稳定氧化锆（Y-TZP）陶瓷是一种高性能的材料，具有优良的机械性能，适用于固定局部义齿。本研究的目的是评估疲劳测试后，热处理和贴面对使用烧结和随后热等静压氧化钇部分稳定氧化锆（Denzir）制造的框架的抗断裂性的影响。试件在水中承受动态载荷。此后，使用万能试验机，测定了三单元固定局部义齿的抗断裂性;（i）在机加工后交付的框架，（ii）在框架经过类似于用玻璃陶瓷（Eris）或基于滑石的陶瓷（Vita D）贴面的热处理后，以及（iii）在框架用这些陶瓷贴面后。此外，还测定了机械加工后未在水中承受动态载荷的支架的抗断裂性。水中循环载荷对抗断裂性能无显著影响（p > 0.05）。机加工后，使框架断裂所需的载荷显著（p < 0.001）高于热处理和贴面样本。Eris贴面组与Vita D贴面组间无显著性差异（p > 0.05）。除三个样本外，所有样本的断裂均位于加载点，并穿过其中一个连接器。热处理和贴面降低了热等静压氧化锆的抗断裂性能。然而，所获得的结果表明，它是一个有趣的材料的潜力，在全陶瓷涂层。(c)2004年牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objectives. Yttria-stabilized zirconia (Y-TZP) ceramic is a high-performance material with excellent mechanical properties suitable for fixed partial dentures. The purpose of this study was to evaluate after fatigue testing, the effect of heat-treatment and veneering on the fracture resistance of frameworks manufactured using sintered and subsequently hot isostatic pressed yttrium oxide partially-stabilized zirconia (Denzir).Methods. The specimens were subjected to dynamic loading in water. Thereafter, using a universal testing machine, the fracture resistance of three-unit fixed partial dentures was determined; (i) of the frameworks as delivered after machining, (ii) after the frameworks had been subjected to heat-treatment similar to veneering with a glass-ceramic (Eris) or a feldspar-based ceramic (Vita D) and (iii) after the frameworks had been veneered with these ceramics. In addition, the fracture resistance of frameworks as delivered after machining not subjected to dynamic loading in water was determined.Results. Cyclic loading in water did not significantly (p > 0.05) affect the fracture resistance. The load necessary to fracture the frameworks as delivered after machining was significantly (p < 0.001) higher than for the heat-treated and veneered specimens. No significant difference was seen between the specimens veneered with Eris and those veneered with Vita D (p > 0.05). For all but three specimens the fractures were Located in the loading point and through one of the connectors.Significance. Heat-treatment and veneering reduce fracture resistance of hot isostatic pressed zirconia. Nevertheless, the results obtained indicate that it is an interesting material for potential in all-ceramic restorations. (c) 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.