Orientation and deformation of mineral crystals in tooth surfaces
Orientation and deformation of mineral crystals in tooth surfaces
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DOI：
10.1016/j.jmbbm.2012.02.025
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发表时间：
2012-06-01
影响因子：
3.9
通讯作者：
Tadano, Shigeru
中科院分区：
文献类型：
--
作者：
Fujisaki, Kazuhiro;Todoh, Masahiro;Tadano, Shigeru
牙釉质是人体最坚硬的物质，主要由羟基磷灰石（HAp）类矿物质颗粒组成。由于HAp具有六方晶体结构，因此可以利用X射线衍射方法来分析牙齿中HAp的晶体结构。这里，将X射线衍射方法应用于牙釉质表面来测量HAp晶体的取向和应变。 HAp的六方晶体结构的c轴取向为垂直于覆盖牙齿表面的牙釉质的表面。因此，牙齿表面的 HAp 应变是通过沿 c 轴排列的 (004) 晶格面的 X 射线衍射来测量的。 X 射线应变测量是在负载下表面完好的牙齿样本上进行的。通过在加载过程中精确定位 X 射线照射区域，可以对牙齿样本表面进行高精度应变测量。 (004)晶格面的应变是在沿着齿轴压缩的样品表面的几个位置测量的。获得的应变是门牙样本唇侧的拉伸应变。在后牙中，不同测量位置的应变不同，从拉伸类型到压缩类型各不相同。 (C) 2012 Elsevier Ltd. 保留所有权利。
Tooth enamel is the hardest material in the human body, and it is mainly composed of hydroxyapatite (HAp)-like mineral particles. As HAp has a hexagonal crystal structure, X-ray diffraction methods can be used to analyze the crystal structure of HAp in teeth. Here, the X-ray diffraction method was applied to the surface of tooth enamel to measure the orientation and strain of the HAp crystals. The c-axis of the hexagonal crystal structure of HAp was oriented to the surface perpendicular to the tooth enamel covering the tooth surface. Thus, the strain of HAp at the surface of teeth was measured by X-ray diffraction from the (004) lattice planes aligned along the c-axis. The X-ray strain measurements were conducted on tooth specimens with intact surfaces under loading. Highly accurate strain measurements of the surface of tooth specimens were performed by precise positioning of the X-ray irradiation area during loading. The strains of the (004) lattice plane were measured at several positions on the surface of the specimens under compression along the tooth axis. The strains were obtained as tensile strains at the labial side of incisor tooth specimens. In posterior teeth, the strains were different at different measurement positions, varying from tensile to compressive types. (C) 2012 Elsevier Ltd. All rights reserved.