Approximate relative fatigue life estimation methods for thin-walled monolithic ceramic crowns.
Approximate relative fatigue life estimation methods for thin-walled monolithic ceramic crowns.
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DOI：
10.1016/j.dental.2018.01.020
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发表时间：
2018-05
期刊：
影响因子：
--
通讯作者：
Rokhlin SI
中科院分区：
文献类型：
--
作者：
Nasrin S;Katsube N;Seghi RR;Rokhlin SI
目的是建立一种模拟咀嚼载荷下薄壁单片修复体相对疲劳寿命的近似估计方法。现有文献中氟云母、白晶石、二硅酸锂和钇稳定氧化锆的实验测量疲劳参数用N次加载循环前的最大循环应力和初始裂纹尺寸对应的应力来表示，以评估其差异。假设破坏主要发生在高应力区，忽略应力状态的多轴性，探索近似恢复寿命方法。利用简单的陶瓷LD三层恢复模型进行了实验，以检验模型的有效性。我们发现陶瓷疲劳在临床相关的载荷范围和咀嚼频率上是相似的，从而建立了一个近似的疲劳方程，该方程普遍适用于广泛的牙科陶瓷材料。将该方程纳入恢复寿命的近似估计中，得到快速断裂参数、高应力区ΔA、高应力平均ΔA和n的简单表达式，实验初步验证了该方法的有效性。将快速断裂参数对修复寿命的影响与其他因素分离，将表面处理的重要性体现在简化方程中。最大应力和高应力区面积也起着关键作用。虽然没有什么可以取代实际的临床研究，但这种方法可以提供相对修复寿命的合理初步估计。
The objective is to establish an approximate relative fatigue life estimation method under simulated mastication load for thin-walled monolithic restorations. Experimentally measured fatigue parameters of fluormica, leucite, lithium disilicate and yttrium-stabilized zirconia in the existing literature were expressed in terms of the maximum cyclic stress and stress corresponding to initial crack size prior to N number of loading cycles to assess their differences. Assuming that failures mostly originate from high stress region, an approximate restoration life method was explored by ignoring the multi-axial nature of stress state. Experiments utilizing a simple trilayer restoration model with ceramic LD were performed to test the model validity. Ceramic fatigue was found to be similar for clinically relevant loading range and mastication frequency, resulting in the development of an approximate fatigue equation that is universally applicable to a wide range of dental ceramic materials. The equation was incorporated into the approximate restoration life estimation, leading to a simple expression in terms of fast fracture parameters, high stress area ΔA, the high stress averaged over ΔA and N. The developed method was preliminarily verified by the experiments. The impact of fast fracture parameters on the restoration life was separated from other factors, and the importance of surface preparation was manifested in the simplified equation. Both the maximum stress and the area of high stress region were also shown to play critical roles. While nothing can replace actual clinical studies, this method could provide a reasonable preliminary estimation of relative restoration life.
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DOI：
10.1016/j.dental.2013.04.004
发表时间：
2013-07
期刊：
Dental materials : official publication of the Academy of Dental Materials
影响因子：
--
作者：
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通讯作者：
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影响因子：
14
作者：
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通讯作者：
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DOI：
10.1007/s10856-006-0661-1
发表时间：
2007-01-01
影响因子：
3.7
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通讯作者：
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影响因子：
4.4
作者：
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通讯作者：
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影响因子：
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