Dental Materials
Volume 25, Issue 1 , Pages 67-73, January 2009

Multiscale analysis of stress distribution in teeth under applied forces

  • Jiro Miura

      Affiliations

    • Division for Interdisciplinary Dentistry, Osaka University School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan
    • Corresponding Author InformationCorresponding author. Tel.: +81 6 6879 2386; fax: +81 6 6879 2387.
    • ,
  • Yoshinobu Maeda

      Affiliations

    • Division for Interdisciplinary Dentistry, Osaka University School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan
    • ,
  • Hiroaki Nakai

      Affiliations

    • Department of Management of Industry and Technology, Osaka University Graduate School of Engineering, Osaka, Japan
    • ,
  • Masaru Zako

      Affiliations

    • Department of Management of Industry and Technology, Osaka University Graduate School of Engineering, Osaka, Japan

Received 15 February 2007; received in revised form 16 March 2008; accepted 8 April 2008.

Abstract 

Objectives

The present study aimed to clarify stress distribution in teeth under an external applied load using microindentation and multiscale simulation.

Methods

Anisotropic material properties of enamel and dentin were measured using a microindentation method with a dynamic ultra microhardness tester. The numerical model was constructed using the finite element mesh superposition method with a microscale (enamel rods), mesoscale (teeth), and macroscale (bone). Multiscale simulation was used to analyze different scale structures. A concentrated load (10N) was applied to the labial surface of the central incisor.

Results

The results revealed stresses of 5MPa (normal stress) and 6.5MPa (shear stress) in the enamel sheath at the center of the labial region compared to 1.4MPa (normal stress) and 21.4MPa (shear stress) in the cervical region.

Significance

These results suggest that shear stresses in the enamel sheath may play significant roles in stress transmission.

Keywords: Finite element analysis, Multiscale simulation, Enamel microstructure, Microindentation

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PII: S0109-5641(08)00141-3

doi:10.1016/j.dental.2008.04.015

Dental Materials
Volume 25, Issue 1 , Pages 67-73, January 2009

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