Effect of prism orientation and loading direction on contact stresses in prismatic enamel of primates: implications for interpreting wear patterns

American Journal of Physical Anthropology
Daisuke ShimizuI R Spears

Abstract

The ability of prisms to effectively dissipate contact stress at the surface will influence wear rates in teeth. The aim of this investigation was to begin to quantify the effect of prism orientation on surface stresses. Seven finite element models of enamel microstructure were created, each model differing in the angulation of prism orientation with regard to the wear surface. For validation purposes, the mechanical behavior of the model was compared with published experimental data. In order to test the enamel under lateral loads, a compressed food particle was dragged across the surface from the dentino-enamel junction (DEJ) towards the outer enamel surface (OES). Under these conditions, tensile stresses in the enamel model increased with increases in the coefficient of friction. More importantly, stresses were found to be lowest in models in which the prisms approach the surface at lower angles (i.e., more obliquely cut prisms), and highest when the prisms approached the surface at 60 degrees (i.e., less obliquely cut). Finally, the direction of travel of the simulated food particle was reversed, allowing comparison of the difference in behavior between trailing and leading edge enamels (i.e., when the food particle was dra...Continue Reading

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Citations

Sep 12, 2007·Analytical and Bioanalytical Chemistry·Li-Hong HeMichael V Swain
Feb 11, 2010·Journal of Materials Science. Materials in Medicine·Griselda GuidoniIngomar Jäger
Sep 15, 2014·Dental Materials : Official Publication of the Academy of Dental Materials·YungChung Chen, Alex Fok
Jun 30, 2012·Acta Biomaterialia·Bingbing AnDongsheng Zhang
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Jan 1, 2008·Journal of the Mechanical Behavior of Biomedical Materials·Li Hong He, Michael V Swain
Dec 7, 2011·American Journal of Physical Anthropology·Peter S Ungar
Apr 9, 2014·Journal of Prosthodontic Research·Natsuko Murakami, Noriyuki Wakabayashi
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Feb 26, 2016·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Michael A Berthaume
Jul 10, 2009·Journal of Dental Research·Z XieM J Hoffman
Oct 27, 2018·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Léanie Alloing-SéguierCamille Martinand-Mari
Apr 11, 2008·Nature·Peter Ungar
Aug 28, 2020·Biology Letters·Oscar Borrero-LopezBrian R Lawn
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Jul 28, 2020·Acta Biomaterialia·Cayla A StiflerPupa U P A Gilbert

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