Effects of occlusal load on the stress distribution of four cavity configurations of noncarious cervical lesions: A three-dimensional finite element analysis study

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Restor Dent Endod. 2006;31(5):359-370

Publication date (electronic) : 2006 January 14

doi : https://doi.org/10.5395/JKACD.2006.31.5.359

Sang-Je Jeon ¹, Jeong-Kil Park ¹, Hyeon-Cheol Kim ¹, Sung-Gwan Woo ², Kwang-Hoon Kim ², Kwon Son ², Bock Hur ¹^,

¹Department of Conservative dentistry, College of Dentistry, Pusan National University

²Department of Mechanical design engineering, College of Engineering, Pusan National University

^*Corresponding Author: Bock Hur, Department of Conservative Dentistry, College of Dentistry, Pusan National University, 1-10, Ami-dong, Seo-gu, Busan, 602-739, Korea, Tel: 82-51-240-7455, E-mail: bhur@pusan.ac.kr

Received 2006 July 04; Revised 2006 July 28; Accepted 2006 September 04.

Abstract

The objective of this study was to investigate the effect of excessive occlusal loading on stress distribution on four type of cervical lesion, using a three dimensional finite element analysis (3D FEA).

The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. Four different lesion configurations representative of the various types observed clinically for teeth were studied. A static point load of 500N was applied to the buccal and lingual cusp (Load A and B). The principal stresses in lesion apex, and vertical sectioned margin of cervical wall were analyzed.

The results were as follows

The patterns of stress distribution were similar but the magnitude was different in four types of lesion.
The peak stress was observed at mesial corner and also stresses concentrated at lesion apex.
The compressive stress under load A and the tensile stress under load B were dominant stress.
Under the load, lesion can be increased and harmful to tooth structure unless restored.

Keywords: Cervical lesion; Finite element analysis; Occlusal load; Stress distribution; Compressive stress; Tensile stress

Figure 1.

Four types of lesion configurations.

Figure 2.

Design of loading conditions.

Figure 3.

The Principal stress distribution of four cavities under Load A and B(Upper 2 rows: maximal and minimal principal stress under load A, Lower 2 rows; maximal and minimal principal stress under load B. From left line, notch-shape showed, followed by saucer, combined, U-shape lesion)

Figure 4.

Principal stresses of lesion apex of 4 shape lesion.

Figure 5.

Vertical distribution of principal stresses at cavity wall in 4 shape lesion. (If the value of one principal stress of an element was positive, the element was determined to be in the tensile condition, if it was negative, the element was determined to be in the compressive condition).

Table 1.

Numbers of nodes and elements for each cavity

Table 2.

Mechanical properties of the tooth used in the study

Table 3.

Mechanical properties of teeth (MPa)*

Table 4.

Peak stresses of lesion apex of four cavities

Table 5.

Peak stresses values of inner cavity wall vertically

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