Abstract
A photoelastic stress analysis technique has been conducted for many years as a test to analyze stress distribution of porcelain jacket crowns under a load. The purpose of this study was to evaluate the alteration of stress distribution on ceramic jacket crowns by each abutment material of different elasticity. On the assumption that the jacket crown consists of castable ceramics (DICOR) and three different abutment materials had metal cores (12% Au-Ag-Pd alloy), a resin core (photocuring composite resin) and a natural tooth, the crown and the abutment tooth model were made of epoxy resin. And the stress analysis of the ceramic jacket crown was studied by three-dimensional stress freezing photoelasticity experimental technique.The boundary stress in the portion with the added load reached the maximum value in all abutment teeth. The magnitude of boundary stress increased with the decrease in the elastic modulus of the abutment material. Especially, when the abutment was a resin core or a natural tooth, high boundary stress was observed around the labial cervix.
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