Variability in the elastic properties of bovine dentin at multiple length scales
Variability in the elastic properties of bovine dentin at multiple length scales
复制标题
DOI：
10.1016/j.jmbbm.2011.08.005
复制
发表时间：
2012-01-01
影响因子：
3.9
通讯作者：
Dunand, D. C.
中科院分区：
文献类型：
--
作者：
Deymier-Black, A. C.;Almer, J. D.;Dunand, D. C.
使用各种方法来研究跨越不同动物、门牙类型和牙齿内位置的乳牛门牙根牙本质样本群体的弹性特性的变异性。首先，在牙本质样本压缩加载过程中，通过高能同步加速器 X 射线散射测量弹性应变，提供了有效模量，即牙本质两个主要相（羟基磷灰石晶体和矿化胶原原纤维）的施加应力与弹性相应变之比，揭示了胶原相和矿物相之间纳米级的载荷传递。其次，通过超声波飞行时间测量在宏观尺度上测量杨氏模量。第三，热重分析在宏观尺度上量化了羟基磷灰石、蛋白质和水的体积分数。最后，微型计算机断层扫描确定了矿物在亚毫米尺度的空间变化。上述特性的统计比较表明：(i) 取自不同动物或不同切牙类型的牙本质样本没有显着差异，但 (ii) 取自颈部或根尖部分以及颊侧和舌侧边缘之间不同位置的样本存在显着差异。 (C) 2011 Elsevier Ltd. 保留所有权利。
Various methods are used to investigate the variability in elastic properties across a population of deciduous bovine incisor root dentin samples spanning different animals, incisor types, and locations within teeth. First, measurements of elastic strains by high-energy synchrotron X-ray scattering during compressive loading of dentin specimens provided the effective modulus - the ratio of applied stress to elastic phase strain for the two main phases of dentin (hydroxyapatite crystals and mineralized collagen fibrils), shedding light on load transfer operating at the nanoscale between collagen and mineral phases. Second, Young's moduli were measured at the macroscale by ultrasonic time-of-flight measurements. Third, thermogravimetry quantified the volume fractions of hydroxyapatite, protein and water at the macroscale. Finally, micro-Computed Tomography determined spatial variations of the mineral at the sub-millimeter scale. Statistical comparison of the above properties reveals: (i) no significant differences for dentin samples taken from different animals or different incisor types but (ii) significant differences for samples taken from the cervical or apical root sections as well as from different locations between buccal and lingual edges. (C) 2011 Elsevier Ltd. All rights reserved.