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KMID : 0376319900020010293
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Dental Journal of CNU
1990 Volume.2 No. 1 p.293 ~ p.314
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STRESS ANALYSIS OF VARIOUS ESTHETIC RESTORATIONS BY FINITE ELEMENT METHOD
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Jo Jin-Hee
Vang Mong-Sook
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Abstract
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The purpose of this study was to analyze the stresses and displacements of various esthetic restorations and abutment teeth.
The finite element models of central incisor were divided into four groups according to the types of restoration.
Three load cases were applied ; 1) 45 degrees on the incisal edge, 2) horizontal force on the labial surface, and 3) 26 degrees diagonally on the lingual surface.
Material property, geometry, and load conditions of each model were inputed to the two dimensional finite element program and stresses and displacements were analyzed.
Results were as follows ;
1. In the cases of porcelain fused gold crown and porcelain laminate veneer, stresses were equally distributed in supporting abutment tooth.
The metal coping of porcelain fused gold crown and collarless porcelain fused gold crown functioned as a good stress distributor.
3. When the horizontal load applied, the highest tensile and compressive stresses were seen in the cervical margin of restoration and the dentin of the abutment tooth.
4. The highest displacement of restoration was seen when load was applied at an angle of 26 degrees diagonally in lingual surface of tooth in centric occlusion.
5. The influence of loading direction on the stresses and displacements in the restoration was greater than that of various design.
6. The possibility of fracture was highest in porcelain jacket crown.
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