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首页> 外文期刊>Journal of Biomechanics >Evaluation of fracture toughness of human dentin using elastic-plastic fracture mechanics.
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Evaluation of fracture toughness of human dentin using elastic-plastic fracture mechanics.

机译：使用弹塑性断裂力学评估人牙本质的断裂韧性。

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摘要

Dentin, the mineralized tissue forming the bulk of the tooth, lies between the enamel and the pulp chamber. It is a rich source of inspiration for designing novel synthetic materials due to its unique microstructure. Most of the previous studies investigating the fracture toughness of dentin have used linear-elastic fracture mechanics (LEFM) that ignores plastic deformation and could underestimate the toughness of dentin. With the presence of collagen (approximately 30% by volume) aiding the toughening mechanisms in dentin, we hypothesize that there is a significant difference between the fracture toughness estimated using LEFM (Kc) and elastic-plastic fracture mechanics (EPFM) (KJc). Single-edge notched beam specimens with in-plane (n=10) and anti-plane (n=10) parallel fractures were prepared following ASTM standard E1820 and tested in three-point flexure. KJc of the in-plane parallel and anti-plane parallel specimens were found to be 3.1 and 3.4 MPa m 1/2 and Kc were 2.4 and 2.5 MPa m 1/2, respectively. The fracture toughness estimated based on KJc is significantly greater than that estimated based on Kc (32.5% on average; p<0.001). In addition, KJc of anti-plane parallel specimens is significantly greater than that of in-plane parallel specimens. We suggest that, in order to critically evaluate the fracture toughness of human dentin, EPFM should be employed.
机译：牙本质是形成牙齿大部分的矿化组织，位于牙釉质和牙髓腔之间。由于其独特的微观结构，它为设计新型合成材料提供了丰富的灵感来源。以前大多数研究牙本质断裂韧性的研究都使用了线性弹性断裂力学（LEFM），该力学忽略了塑性变形，可能低估了牙本质的韧性。假设存在胶原蛋白（约占体积的30％）有助于牙本质的增韧机制，我们假设使用LEFM（Kc）和弹塑性断裂力学（EPFM）（KJc）估算的断裂韧性之间存在显着差异。按照ASTM标准E1820制备具有面内（n = 10）和反面（n = 10）平行断裂的单边缺口梁试样，并进行三点弯曲试验。面内平行试样和反面平行试样的KJc分别为3.1和3.4 MPa m 1/2，Kc分别为2.4和2.5 MPa m 1/2。根据KJc估算的断裂韧性明显大于根据Kc估算的断裂韧性（平均32.5％; p <0.001）。另外，反平面平行试样的KJc明显大于平面平行试样的KJc。我们建议，为了严格评估人类牙本质的断裂韧性，应采用EPFM。

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