Mechanics of microwear traces in tooth enamel
Mechanics of microwear traces in tooth enamel
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DOI：
10.1016/j.actbio.2014.11.047
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发表时间：
2015-03-01
影响因子：
9.7
通讯作者：
Lawn, Brian R.
中科院分区：
文献类型：
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作者：
Borrero-Lopez, Oscar;Pajares, Antonia;Lawn, Brian R.
据推测，天然牙釉质中的微磨损痕迹可以使用微压痕力学来模拟和量化。与口腔磨损介质中的颗粒相关的微接触被建模为具有固定半顶角的尖锐压头。区分来自静态接触（凹坑）和平移接触（划痕）的标记。产生给定尺寸的接触所需的力的关系推导出，颗粒的棱角性和遵守特别考虑，以区分不同的磨料在食物来源。图像的图案上的人牙釉质与轴向和滑动负载的尖锐压头与理论预测。特别注意从微塑性过渡到微裂纹模式，对应于轻度和严重的磨损域的阈值条件。它表明，典型的微磨损痕迹是在1 N的顺序上产生的负载-即远远小于在正常咬合中施加的力，证明牙齿在日常咀嚼中磨损的敏感性，特别是在尖锐，坚硬和大的包容性的内在或外来颗粒的饮食。由Elsevier Ltd.代表Acta Materialia Inc.出版。
It is hypothesized that microwear traces in natural tooth enamel can be simulated and quantified using microindentation mechanics. Microcontacts associated with particulates in the oral wear medium are modeled as sharp indenters with fixed semi-apical angle. Distinction is made between markings from static contacts (pits) and translational contacts (scratches). Relations for the forces required to produce contacts of given dimensions are derived, with particle angularity and compliance specifically taken into account so as to distinguish between different abrasives in food sources. Images of patterns made on human enamel with sharp indenters in axial and sliding loading are correlated with theoretical predictions. Special attention is given to threshold conditions for transition from a microplasticity to a microcracking mode, corresponding to mild and severe wear domains. It is demonstrated that the typical microwear trace is generated at loads on the order of 1 N - i.e. much less than the forces exerted in normal biting attesting to the susceptibility of teeth to wear in everyday mastication, especially in diets with sharp, hard and large inclusive intrinsic or extraneous particulates. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.