期刊
ACTA BIOMATERIALIA
卷 6, 期 6, 页码 2172-2180出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2009.11.017
关键词
Collagen; Hydroxyapatite; Mechanical properties; X-ray diffraction; Dentin
资金
- US Department of Energy, Office of Science [DE-AC02-06CH11357]
- Department of Defense
The elastic properties of dentin, a biological composite consisting of stiff hydroxyapatite (HAP) nano-platelets within a compliant collagen matrix, are determined by the volume fraction of these two phases and the load transfer between them. We have measured the elastic strains in situ within the HAP phase of bovine dentine by high energy X-ray diffraction for a series of static compressive stresses at ambient temperature. The apparent HAP elastic modulus (ratio of applied stress to elastic HAP strain) was found to be 18 +/- 2 GPa. This value is significantly lower than the value of 44 GPa predicted by the lower bound load transfer Voigt model, using HAP and collagen volume fractions determined by thermo-gravimetric analysis. This discrepancy is explained by (i) a reduction in the intrinsic Young's modulus of the nano-size HAP platelets due to the high fraction of interfacial volume and (ii) an increase in local stresses due to stress concentration around the dentin tubules. (C) 2010 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据