Engineering long term clinical success of advanced ceramic prostheses
Engineering long term clinical success of advanced ceramic prostheses
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DOI：
10.1007/s10856-006-0661-1
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发表时间：
2007-01-01
影响因子：
3.7
通讯作者：
Thompson, Van P.
中科院分区：
文献类型：
--
作者：
Rekow, Dianne;Thompson, Van P.
生物相容性以及在某些应用中的美观使全陶瓷假体成为引人注目的选择，但尽管材料性能和增韧机制有了显着改进，但它们仍然具有显着的失败率。导致力量和生存能力下降的因素包括材料选择和假肢设计，它们设定了性能的上限。然而，制造操作会带来损害，环境条件和临床功能可能会加剧损害。以全瓷牙冠为例，通过实验得出的模型可以深入了解材料特性与初始临界失效载荷之间的关系。对制造操作的分析提出了尽量减少损坏的策略。环境条件会产生支撑部件的粘塑性流动，从而在假体内产生额外的应力。疲劳是一个特别具有挑战性的问题，不仅提供能量来传播现有的损坏，而且当与潮湿环境结合时，可以产生新的损坏模式。尽管已知的很多，但这些新损伤模式的影响尚未完全阐明。复杂假体几何形状的作用及其与其他因素的相互作用对损伤发生和传播的影响尚未得到很好的表征。
Biocompatability and, in some applications, esthetics make all-ceramic prostheses compelling choices but despite significant improvements in materials properties and toughening mechanisms, these still have significant failure rates. Factors that contribute to the degradation in strength and survival include material selection and prosthesis design which set the upper limit for performance. However, fabrication operations introduce damage that can be exacerbated by environmental conditions and clinical function. Using all-ceramic dental crowns as an example, experimentally derived models provide insight into the relationships between materials properties and initial critical loads to failure. Analysis of fabrication operations suggests strategies to minimize damage. Environmental conditions can create viscoplastic flow of supporting components which can contribute additional stress within the prosthesis. Fatigue is a particularly challenging problem, not only providing the energy to propagate existing damage but, when combined with the wet environment, can create new damage modes. While much is known, the influence of these new damage modes has not been completely elucidated. The role of complex prosthesis geometry and its interaction with other factors on damage initiation and propagation has yet to be well characterized.