Ｃａｓｔａｂｌｅ Ｇｌａｓｓ Ｃｅｒａｍｉｃｓ‐Ｐｏｒｃｅｌａｉｎ Ｊａｃｋｅｔ Ｃｒｏｗｎの荷重時の応力解析 三次元光弾性実験による応力解析

Abstract

A photoelastic stress analysis technique has been conducted for many years as a test to predict the mechanical behaviors of porcelain teeth under a load. The purpose of this study was to investigate the stress distribution of a castable glass ceramics-porcelain jacket crown under a static load and obtain the some informations for producing the jacket crown. On the assumption that the jacket crown consist of two layers (castable glass ceramics coping and dental porcelain), the crown models were made of epoxy resin. Three different loading sites were chosen (lingual porcelain surface, lingual castable glass ceramics surface and incisal porcelain surface) to epoxy resin models.In the case of the model which the load (2.0 kgf) was added to the lingual castable glass ceramics portion, the tensile stress in the labial porcelain portion reached the maximum value. And, when the same load was added to the lingual porcelain portion of the model, the tensile stress in the lingual castable glass ceramics portion reached the maximum value. Furthermore, in the model which was added to the lingual castable glass ceramics portion, the high tensile stress was observed in the lingual castable glass ceramics-porcelain border.