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Type: Journal article
Title: Structural integrity of enamel: experimental and modeling
Author: Xie, Z.
Swain, M.
Hoffman, M.
Citation: Journal of Dental Research, 2009; 88(6):529-533
Publisher: Inter Amer Assoc Dental Research
Issue Date: 2009
ISSN: 0022-0345
Statement of
Z. Xie, M.V. Swain and M.J. Hoffman
Abstract: Tooth enamel is the hardest tissue in the human body and is directly responsible for dental function. Due to its non-regenerative nature, enamel is unable to heal and repair itself biologically after damage. We hypothesized that with its unique microstructure, enamel possesses excellent resistance to contact-induced damage, regardless of loading direction. By combining instrumented indentation tests with microstructural analysis, we report that enamel can absorb indentation energy through shear deformation within its protein layers between apatite crystallites. Moreover, a near-isotropic inelastic response was observed when we analyzed indentation data in directions either perpendicular or parallel to the path of enamel prisms. An "effective" crystal orientation angle, 33 degrees -34 degrees, was derived for enamel microstructure, independent of the loading direction. These findings will help guide the design of the nanostructural architecture of dental restorative materials.
Keywords: Tooth enamel; contact damage resistance; stress-strain behaviour; crystal orientation angle; structural integrity
Rights: Copyright © 2012 by International & American Associations for Dental Research
RMID: 0020122911
DOI: 10.1177/0022034509337130
Appears in Collections:Mechanical Engineering publications
Materials Research Group publications

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