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Comparison of mechanical behaviors of enamel rod and interrod regions in enamel

Published online by Cambridge University Press:  03 January 2012

Siang Fung Ang
Affiliation:
Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg 21073, Germany
Mahnaz Saadatmand
Affiliation:
Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg 21073, Germany
Michael V. Swain
Affiliation:
Biomaterials Science Research Unit, Faculty of Dentistry, University of Sydney, New South Wales 2006, Australia; and Department of Oral Sciences, University of Otago, Dunedin 9054, New Zealand
Arndt Klocke
Affiliation:
Division of Orthodontics, Department of Orofacial Sciences, University of California, San Francisco, California 94143; and Department of Orthodontics, University Medical Center Hamburg-Eppendorf, Hamburg 20246, Germany
Gerold A. Schneider*
Affiliation:
Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg 21073, Germany
*
a)Address all correspondence to this author. e-mail: g.schneider@tuhh.de
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Abstract

Interrod regions exist between the enamel rods and are known to have different crystallite orientations and a higher organic content compared to the enamel rods (the intrarod regions). This study aims to characterize the mechanical properties of both regions especially the time-dependent properties by using spherical indentation. Despite the very small amount of proteins, the interrod region shows statistically significantly higher inelastic energy dissipation than the intrarod region with increased deformation times. The total displacement under constant load (creep), viscosity, and stress relaxation behavior of both regions are also reported. Similar to the observation of previous studies, the elastic modulus and hardness in the intrarod region are significantly higher than in the interrod region.

Type
Articles
Copyright
Copyright © Materials Research Society 2011

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