Hidden contributions of the enamel rods on the fracture resistance of human teeth.
Hidden contributions of the enamel rods on the fracture resistance of human teeth.
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DOI：
10.1016/j.actbio.2012.09.020
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发表时间：
2013-01
影响因子：
9.7
通讯作者：
Arola, Dwayne D.
中科院分区：
文献类型：
--
作者：
Yahyazadehfar, M.;Bajaj, Devendra;Arola, Dwayne D.
人类牙齿的釉质通常被认为是具有低断裂韧性的脆性材料。因此，这种组织在抵抗牙齿断裂中的贡献及其复杂的微观结构的重要性在很大程度上被忽视了。在这项研究中，对人牙釉质的裂纹生长阻力进行了实验评估，以表征杆（即棱柱）取向和交叉程度对该组织断裂行为的作用。增量裂纹扩展实现在平面内，与杆在纵向或横向于其轴的方向。结果表明，牙釉质的抗折强度具有不均匀性和空间各向异性。横向于外釉中的杆延伸的裂纹随着延伸经历较低的韧性上升，并且实现比纵向方向显著更低的抗断裂性。虽然在牙齿表面开始的裂纹可能开始向牙本质-釉质连接处延伸，但是它们被交叉的杆偏转并且围绕牙齿的周边继续生长，横向于外部釉质中的杆。这个过程有助于分散断裂能量，并避免裂纹向牙本质和活髓延伸。
The enamel of human teeth is generally regarded as a brittle material with low fracture toughness. Consequently, the contributions of this tissue in resisting tooth fracture and the importance of its complex microstructure have been largely overlooked. In this study an experimental evaluation of the crack growth resistance of human enamel was conducted to characterize the role of rod (i.e. prism) orientation and degree of decussation on the fracture behavior of this tissue. Incremental crack growth was achieved in-plane, with the rods in directions longitudinal or transverse to their axes. Results showed that the fracture resistance of enamel is both inhomogeneous and spatially anisotropic. Cracks extending transverse to the rods in the outer enamel undergo a lower rise in toughness with extension, and achieve significantly lower fracture resistance than in the longitudinal direction. Though cracks initiating at the surface of teeth may begin extension towards the dentin–enamel junction, they are deflected by the decussated rods and continue growth about the tooth’s periphery, transverse to the rods in the outer enamel. This process facilitates dissipation of fracture energy and averts cracks from extending towards the dentin and vital pulp.
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比较人搪瓷和羟基磷灰石疲劳裂纹的生长。
影响因子：
14
作者：
Bajaj, Devendra;Nazari, Ahmad;Eidelman, Naomi;Arola, Dwayne D.
通讯作者：
Arola, Dwayne D.
DOI：
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作者：
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作者：
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