Fatigue of dental ceramics.
Fatigue of dental ceramics.
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DOI：
10.1016/j.jdent.2013.10.007
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发表时间：
2013-12
影响因子：
4.4
通讯作者：
Lawn BR
中科院分区：
文献类型：
--
作者：
Zhang Y;Sailer I;Lawn BR
有关存活率的临床数据显示，全瓷修复体容易因反复咬合负荷而发生骨折。本综述的目的是研究目前和未来牙科陶瓷疲劳的潜在机制。使用牙科和生物力学文献中陶瓷层标本的断裂试验数据，阐明了各种疲劳模式的本质。失效模式可能会在整个生命周期内发生变化，具体取决于修复几何形状、载荷条件和材料特性。在单周加载中工作的模式可能被多循环加载中的可选模式所主导。虽然对失败假体的尸检可以确定某些骨折的来源，但这些骨折在失败过程中的演变仍然知之甚少。虽然人们普遍认为牙科陶瓷在重复加载时的承载能力的丧失是由于在水存在下化学辅助的“缓慢裂纹扩展”，但我们证明了存在更有害的疲劳机制，本质上是机械的而不是化学的。忽视机械疲劳可能会导致对预计存活率的严重高估。基于裂纹遏制的理念，提出了延长陶瓷修复体临床寿命的策略。
Clinical data on survival rates reveal that all-ceramic dental prostheses are susceptible to fracture from repetitive occlusal loading. The objective of this review is to examine the underlying mechanisms of fatigue in current and future dental ceramics. The nature of various fatigue modes is elucidated using fracture test data on ceramic layer specimens from the dental and biomechanics literature. Failure modes can change over a lifetime, depending on restoration geometry, loading conditions and material properties. Modes that operate in single-cycle loading may be dominated by alternative modes in multi-cycle loading. While post-mortem examination of failed prostheses can determine the sources of certain fractures, the evolution of these fractures en route to failure remains poorly understood. Whereas it is commonly held that loss of load-bearing capacity of dental ceramics in repetitive loading is attributable to chemically-assisted 'slow crack growth' in the presence of water, we demonstrate the existence of more deleterious fatigue mechanisms, mechanical rather than chemical in nature. Neglecting to account for mechanical fatigue can lead to gross overestimates in predicted survival rates. Strategies for prolonging the clinical lifetimes of ceramic restorations are proposed based on a crack-containment philosophy.
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影响因子：
9.4
作者：
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通讯作者：
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DOI：
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发表时间：
2011-04-01
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通讯作者：
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