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Proceedings Paper

Evaluation of the shrinking strain in dentin and enamel using digital image correlation
Author(s): Shuangshuang Mao; Chenglin Lu; Dwayne Arola; Dongsheng Zhang
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Paper Abstract

In this study the deformation in dentin and enamel resulting from the onset of dehydration was quantified using microscopic Digital Image Correlation (DIC). The objectives of the study were to quantify the dimensional changes in dentin and enamel at the onset of dehydration, to examine the anisotropy in deformation, and to identify if there are differences in dehydration related behavior of these tissues associated with patient age. Human premolars and molars were obtained from participating dental clinics in hospitals around Shanghai, China. The teeth were sectioned bucco-lingually using a slow speed diamond saw under continuous water-based coolant. Dentin and enamel were separated along the dentin-enamel junction (DEJ) and contained in Hanks Balanced Salt Solution (HBSS) until test. Then specimens were placed on a precision mass scale with resolution of 0.1 mg to measure the mass loss under air convection in room temperature. The surface images were acquired with a microscopic imaging system and the strain of the specimens (dentin and enamel) in two orthogonal directions, i.e. parallel and perpendicular to the dentin tubules and enamel prisms were analyzed. Results show that both tissues underwent shrinkage with water loss in the two orthogonal directions and regardless of age. The magnitude of strain within the enamel is lower than that within the dentin. The young dentin exhibits an anisotropic response with water loss where the largest shrinkage takes place perpendicular to the dentin tubules, while the shrinkage in old dentin is essentially equivalent in the two directions.

Paper Details

Date Published: 24 August 2009
PDF: 5 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737505 (24 August 2009); doi: 10.1117/12.838995
Show Author Affiliations
Shuangshuang Mao, Shanghai Institute of Applied Mathematics and Mechanics (China)
Chenglin Lu, Shanghai Institute of Applied Mathematics and Mechanics (China)
Dwayne Arola, Univ. of Maryland, Baltimore County (United States)
Dongsheng Zhang, Shanghai Univ. (China)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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