Crack blunting, crack bridging and resistance-curve fracture mechanics in dentin: effect of hydration
Crack blunting, crack bridging and resistance-curve fracture mechanics in dentin: effect of hydration
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DOI：
10.1016/s0142-9612(03)00458-7
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发表时间：
2003-12-01
期刊：
影响因子：
14
通讯作者：
Ritchie, RO
中科院分区：
文献类型：
--
作者：
Kruzic, JJ;Nalla, RK;Ritchie, RO
很少有研究集中在描述牙本质的断裂韧性特性方面的阻力曲线（R曲线）行为，即，抗断裂性随着裂纹延伸而增加，特别是考虑到所涉及的相关增韧机制。因此，在本研究中，基于断裂力学的实验进行大象牙本质，以确定这样的R曲线，以确定突出的增韧机制，并辨别水合作用如何影响其效力。通过显微镜和X射线断层扫描直接观察到的未开裂韧带的裂纹桥接被确定为主要的增韧机制，并通过基于顺应性的实验提供了进一步的实验证据。此外，在水合作用下，观察到牙本质显示出显著的裂纹钝化，导致比脱水材料更高的整体抗断裂性。这项工作的结果被认为是重要的角度来模拟牙本质的断裂行为和预测其失败在体内。(C)2003爱思唯尔有限公司。保留所有权利。
Few studies have focused on a description of the fracture toughness properties of dentin in terms of resistance-curve (R-curve) behavior, i.e., fracture resistance increasing with crack extension, particularly in light of the relevant toughening mechanisms involved. Accordingly, in the present study, fracture mechanics based experiments were conducted on elephant dentin in order to determine such R-curves, to identify the salient toughening mechanisms and to discern how hydration may affect their potency. Crack bridging by uncracked ligaments, observed directly by microscopy and X-ray tomography, was identified as a major toughening mechanism, with further experimental evidence provided by compliance-based experiments. In addition, with hydration, dentin was observed to display significant crack blunting leading to a higher overall fracture resistance than in the dehydrated material. The results of this work are deemed to be of importance from the perspective of modeling the fracture behavior of dentin and in predicting its failure in vivo. (C) 2003 Elsevier Ltd. All rights reserved.