24 August 2009 Evaluation of the shrinking strain in dentin and enamel using digital image correlation
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Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 737505 (2009) https://doi.org/10.1117/12.838995
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China
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.
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Shuangshuang Mao, Shuangshuang Mao, Chenglin Lu, Chenglin Lu, Dwayne Arola, Dwayne Arola, Dongsheng Zhang, Dongsheng Zhang, } "Evaluation of the shrinking strain in dentin and enamel using digital image correlation", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737505 (24 August 2009); doi: 10.1117/12.838995; https://doi.org/10.1117/12.838995
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