Mechanical properties of human dental enamel on the nanometre scale
Mechanical properties of human dental enamel on the nanometre scale
复制标题
DOI：
10.1016/s0003-9969(00)00089-3
复制
发表时间：
2001-02-01
影响因子：
3
通讯作者：
Balooch, M
中科院分区：
文献类型：
--
作者：
Habelitz, S;Marshall, SJ;Balooch, M
原子力显微镜（AFM）结合纳米压痕技术被用来揭示结构，并进行特定网站的第三磨牙的釉质力学测试。在牙尖区域制作纳米压痕（尺寸< 500纳米）以测量单个牙釉质棒在不同取向下的机械性能。蚀刻的物理性能的影响进行了研究和蚀刻条件，并没有显着改变牙釉质的塑性-弹性响应进行了定义。弹性和硬度被认为是一个功能的微观结构纹理。在平行和垂直于釉质棒的方向上分别测得平均杨氏模量为87.5（2.2）和72.7（+/-4.5）GPa，平均硬度为3.9 +/-0.3和3.3 +/-0.3 GPa。方差分析表明，差异显著。釉质的各向异性与纤维状磷灰石晶体的排列和釉质棒的复合性质有关。机械性能也进行了研究，在不同的位置上的单一搪瓷棒。与杆的头部区域相比，杨氏模量和硬度在尾部区域和杆间釉质中较低，这可以归因于晶体取向的变化和这些区域中软有机组织的较高含量。(C)2001爱思唯尔科技有限公司版权所有。
Atomic force microscopy (AFM) combined with a nano-indentation technique was used to reveal the structure and to perform site-specific mechanical testing of the enamel of third molars. Nano-indentations (size < 500 nan) were made in the cusp area to measure the mechanical properties of single enamel rods at different orientations. The influence of etching on the physical properties was studied and etching conditions that did not significantly alter the plastic-elastic response of enamel were defined. Elasticity and hardness were found to be a function of the microstructural texture. Mean Young's moduli of 87.5 (2.2) and 72.7(+/-4.5) GPa and mean hardness of 3.9 +/- 0.3 and 3.3 +/- 0.3 GPa were measured in directions parallel and perpendicular to the enamel rods, respectively. Analysis of variance showed that the differences were significant. The observed anisotropy of enamel is related to the alignment of fibre-like apatite crystals and the composite nature of enamel rods. Mechanical properties were also studied at different locations on single enamel rods. Compared to those in the head area of the rods, Young's moduli and hardness were lower in the tail area and in the inter-rod enamel, which can be attributed to changes in crystal orientation and the higher content of soft organic tissue in these areas. (C) 2001 Elsevier Science Ltd. All rights reserved.