Effective property of tooth enamel: Monoclinic behavior
Effective property of tooth enamel: Monoclinic behavior
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DOI：
10.1016/j.jbiomech.2012.02.016
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发表时间：
2012-05-11
影响因子：
2.4
通讯作者：
Korach, Chad S.
中科院分区：
文献类型：
--
作者：
Lu, Cunyou;Nakamura, Toshio;Korach, Chad S.
人类牙釉质具有独特的形态，其特征是重复的细胞排列，由不同方向的羟基磷灰石晶体组成。过去，各种研究人员在实验和数值研究中基于各向同性或正交各向异性力学模型报告了不同的力学性能。然而，这些模型不足以捕捉精确的微观结构对牙釉质机械响应的影响。在本文中，介绍了单斜各向异性模型，该模型可以正确描述牙釉质变形行为。该模型考虑了羟基磷灰石晶体的 3D 取向变化及其空间弹性特性变化。所提出的方法基于晶胞和周期性边界条件，并利用许多杆的集体变形特征来确定单斜模型所需的 13 个独立材料常数。这些常数对于利用有效的属性模型来研究各种机械条件（例如整个牙釉质的磨损、侵蚀、磨损和断裂）是必要的。 (C) 2012 Elsevier Ltd. 保留所有权利。
Human tooth enamel possesses a unique morphology characterized by a repeated cell arrangement, which is composed of varying orientations of hydroxyapatite crystals. In the past, various investigators have reported diverse mechanical properties based on isotropic or orthotropic mechanical models in their experimental and numerical studies. However, these models are insufficient to capture the accurate microstructural effects on the enamel mechanical response. In this paper, a monoclinic anisotropic model, which offers correct descriptions of enamel deformation behaviors, is introduced. The model takes into account the 3D orientation changes of the hydroxyapatite crystals and their spatial elastic property variations. The proposed approach is based on a unit-cell and periodic boundary conditions, and it utilizes the collective deformation characteristics of many rods to determine 13 independent material constants required for the monoclinic model. These constants are necessary to utilize the effective property model to study various mechanical conditions such as abrasion, erosion, wear and fracture of whole tooth enamel. (C) 2012 Elsevier Ltd. All rights reserved.