J Korean Acad Conserv Dent.  2006 Sep;31(5):359-370. 10.5395/JKACD.2006.31.5.359.

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

• Jeon SJ
• Park JK
• Kim HC
• Woo SG
• Kim KH
• Son K
• Hur B

• KMID: 1986879
• DOI: http://doi.org/10.5395/JKACD.2006.31.5.359

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 1. The patterns of stress distribution were similar but the magnitude was different in four types of lesion. 2. The peak stress was observed at mesial corner and also stresses concentrated at lesion apex. 3. The compressive stress under load A and the tensile stress under load B were dominant stress. 4. Under the load, lesion can be increased and harmful to tooth structure unless restored.

Keyword

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

MeSH Terms

Bicuspid
Finite Element Analysis*
Tooth

Figure

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  Figure 1. Four types of lesion configurations.

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  Figure 2. Design of loading conditions.

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  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)

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  Figure 4. Principal stresses of lesion apex of 4 shape lesion.

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  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).

Reference

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