Elastic modulus and stress-strain response of human enamel by nano-indentation

Biomaterials
Li-Hong HeM V Swain

Abstract

Nano-indentation with a sharp (Berkovich) and two spherical indenters with nominal tip radii of 5 and 20 microm was used to determine the elastic modulus and stress-strain response of human enamel. Indentation tests were made over a wide range of peak loads from 1 to 450 mN in two orthogonal directions, i.e., parallel and perpendicular to enamel prisms. The elastic modulus and hardness (mean contact pressure) versus depth of penetration were determined for the three indenters. From the spherical indentation data, stress-strain curves (H-tantheta curve) of enamel were determined in the two orthogonal directions and were found to be different. The elastic modulus showed load dependence for both orientations of the enamel rod structure that depended on the indenter. However, these differences could be normalized upon considering the contact diameter. The indented sample was imaged with an SEM to investigate the near surface damage. In conclusion, prism-sheath structure played an important role in determining the mechanical properties as well as the localized fracture of enamel.

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Citations

Dec 25, 2007·Journal of Materials Science. Materials in Medicine·Saejin ParkDwayne Arola
May 27, 2011·Journal of Materials Science. Materials in Medicine·Li-Hong HeMichael Swain
Oct 15, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Christof HolbergKarin Huth
Jan 16, 2013·Physical Chemistry Chemical Physics : PCCP·Xiaoyue ZhangBiao Wang
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