On the chipping and splitting of teeth
On the chipping and splitting of teeth
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DOI：
10.1016/j.jmbbm.2010.10.011
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发表时间：
2011-04-01
影响因子：
3.9
通讯作者：
Lawn, Brian R.
中科院分区：
文献类型：
--
作者：
Chai, Herzl;Lee, James J. -W.;Lawn, Brian R.
牙齿中最常见的断裂模式之一是碎裂。它可能导致牙齿功能的退化和最终丧失。釉质中的碎片也可以用来深入了解现存动物和化石人类物种的进化历史。在这项研究中，芯片测试进行表面接收或扁平的人磨牙使用硬压头。芯片表现出特征性的扇贝形状，牙齿曲率以及釉质各向异性和不均匀性的一些影响。劈裂倾向于遵循简单的棱柱体间路径，但不可避免地涉及破碎的最后阶段的矿化棱柱体束。一个简单的关系描述了临界载荷与样本边缘咬合接触距离的关系。测得的负载落在正常口腔功能期间施加的咬合力的范围内。在较高载荷下，当接触点靠近齿的中心轴线时，会发生从崩刃到劈裂的过渡。(C)2010爱思唯尔有限公司版权所有。
One of the most frequent fracture modes in teeth is chipping. It can lead to deterioration and ultimate loss of tooth function. Chips in enamel can also be used to gain insight into the evolutionary history of extant animal and fossil hominin species. In this study, chipping tests are performed on the surfaces of as-received or flattened human molars using hard indenters. The chips exhibit a characteristic scallop shape, with some influence from tooth curvature as well as from enamel anisotropy and inhomogeneity. Chipping fracture tends to follow easy interprism pathways, but inevitably involves breakage of bundles of mineralized prisms in the last stages of spallation. A simple relation describes how critical loads for chipping scale with distance of the occlusal contact from the specimen edge. Measured loads fall well within the range of biting forces exerted during normal oral function. A transition from chipping to splitting occurs at higher loads for contacts nearer the central axis of the tooth. (C) 2010 Elsevier Ltd. All rights reserved.