Open Access

ARTICLE

Generalized Stress Intensity Factors for Wedge-Shaped Defect in Human Tooth after Restored with Composite Resins

by Kyousuke Yamaguchi¹, Nao-Aki Noda², Ker-Kong Chen³, Kiyoshi Tajima³, Xin Lan¹

1 Department of Mechanical Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu, 804-8550 Japan
2 Kyushu Institute of Technology, Department of Mechanical Engineering E-mail address:noda@mech.kyutech.ac.jp
3 Kyushu Dental College 2-6-1 Manazuru, Kokurakita-ku, Kitakyushu, 803-8580 Japan

Structural Durability & Health Monitoring 2009, 5(3), 191-200. https://doi.org/10.3970/sdhm.2009.005.191

Abstract

Wedge-shaped defects are frequently observed on the cervical region of the human tooth. Previously, most studies explained that improper tooth-brushing causes such defects. However, recent clinical observation suggested that the repeated stress due to occlusal force may induce the formation of these wedge-shaped defects. In this study, a two-dimensional human tooth model after a wedge-shaped defect is restored with the composite resin is analyzed by using the finite element method. To obtain the intensity of the singular stress accurately, a method of analysis is discussed for calculating generalized stress intensity factors, which control the singular stress around the corner of inclusion. In this study, elastic module ratios of the composite resin are varied systematically. Then, the relationships between the stress intensity and occlusion are discussed.

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Keywords

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