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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >In vitro fatigue behavior of human dentin with implications for life prediction
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In vitro fatigue behavior of human dentin with implications for life prediction

机译：人牙本质的体外疲劳行为及其对生命预测的意义

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摘要

Although human dentin is known to be susceptible to failure under repetitive cyclic fatigue loading, there are few reports in the literature that reliably quantify this phenomenon. This stud seeks to address the paucity of fatigue data through a systematic investigation of the effects of prolonged cyclical loading on human dentin in an environment of ambient temperature Hank's balanced salt solution (HBSS) at cyclic frequencies of 2 and 20 Hz. The "stress-life" (S/N) data thus obtained are discussed in the context of possible mechanisms of fatigue damage and failure in this material. In addition, stiffness loss data collected in situ during the S/N tests are used to deduce crack velocities and the thresholds for such cracking. These results are presented in a fracture mechanics context as plots of fatigue-crack propagation rates (da/dN) as a function of the stress-intensity range (triangle open K). Such S/N and da/dN- triangle open K data are discussed in light of the development of a framework for a fracture-mechanics-based methodology for the prediction of the fatigue life of teeth. It is concluded that the presence of small (on the order of 250 mum) incipient flaws in human teeth will not radically affect their useful life.
机译：尽管已知人类牙本质在反复循环疲劳载荷下容易失效，但文献中很少有报告能够可靠地量化这种现象。本研究旨在通过系统研究环境温度Hank的平衡盐溶液（HBSS）在2和20 Hz的循环温度下长时间循环载荷对人牙本质的影响来解决疲劳数据的匮乏问题。这样获得的“应力寿命”（S / N）数据是在这种材料的疲劳破坏和破坏的可能机理的背景下讨论的。此外，在S / N测试期间就地收集的刚度损失数据可用于推断裂纹速度和此类裂纹的阈值。这些结果在断裂力学环境中表示为疲劳裂纹扩展速率（da / dN）与应力强度范围（三角形开口K）的函数关系。鉴于基于断裂力学的用于预测牙齿疲劳寿命的方法的框架的发展，讨论了这种S / N和da / dN-三角形开放K数据。结论是，人牙齿中小的（大约250微米）初期缺陷的存在不会从根本上影响其使用寿命。

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