Mapping of tooth deformation caused by moisture change using moire interferometry
Mapping of tooth deformation caused by moisture change using moire interferometry
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DOI：
10.1016/s0109-5641(02)00025-8
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发表时间：
2003-05-01
期刊：
影响因子：
5
通讯作者：
Pashley, DH
中科院分区：
文献类型：
--
作者：
Wood, JD;Wang, RZ;Pashley, DH
复合修复材料与牙齿的粘接通常涉及牙本质和牙釉质的表面酸蚀和干燥。这两种硬组织的水分含量有很大的不同。目的：本研究的目的是评价湿度变化对牙釉质约束的牙本质盘和无约束的牙本质盘的尺寸变化的影响。方法：利用湿度的变化引起硬组织水分水平的变化，从而产生跨越牙本质-牙釉质交界处的机械载荷。采用高灵敏度云纹干涉法测量应变大小。将灵敏度为2400线/毫米的衍射栅转移到人类牙齿的湿润抛光切片上，然后脱水，然后再次水合。云纹干涉图记录了水分状态下变形的变化。结果：结果表明，两种试件几何形状之间的应变有很大差异。在两种类型的标本中，通过牙本质的大部分，应变是相当恒定的。然而，在无约束几何结构中，牙本质-牙釉质界面进入牙本质的应变梯度非常高，而在受约束几何结构中，应变梯度几乎为零。意义：云纹干涉法是研究非各向同性和非线弹性材料变形的有力工具。它在牙齿样本中提供全场、高分辨率的变形场。本研究中观察到的变形表明，DEJ区是一种独特的材料界面，需要更好地了解正常牙齿的功能，当自然硬组织恢复时，需要考虑其材料特性。(C)2003年牙科材料学会。爱思唯尔科学有限公司出版。版权所有。
Bonding of composite restorative materials to teeth usually involves surface etching and drying of both dentin and enamel. These two hard tissues have very different water contents.Objectives: The purpose of this study was to evaluate the effects of changes in humidity on the dimensional changes in dentin disks constrained by enamel and in unconstrained dentin.Methods: Changes in humidity were used to induce changes in the moisture level of the hard tissues, which created a mechanical load across the dentin-enamel junction (DEJ). High-sensitivity moire interferometry was used to measure the magnitudes of the strains. Diffraction gratings (with a sensitivity of 2400 lines/mm) were transferred to moist polished sections of human teeth, which were subsequently dehydrated and then hydrated again. The fringe patterns from moire interferometry recorded the change in deformation between the moisture states.Results: The results indicated that there were wide variations in strain between the two specimen geometries. The strains were fairly constant through the bulk of the dentin in both specimen types. However, the strain gradients were very high across the dentin-enamel interface into the dentin in the unconstrained geometry, and nearly zero in the constrained geometry.Significance: Moire interferometry is a powerful tool to study the deformation of materials that are not isotropic and are not linearly elastic. It provides full-field, high-resolution deformation fields in tooth specimens. Deformations observed in this study indicate that the DEJ zone is a unique material interface that needs to be better understood in terms of normal tooth function, and that its material properties be taken into account when natural hard tissues are restored. (C) 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.