Abstract
The purpose of this study was to analyse the stress distributions in new ceremic premolar crowns. Three dimensional finite element analysis of new ceramic premolar crowns were carried out to evaluate the effect of different loading conditions: maximum biting force (500N), and chewing force (200N, 0, 45 and 90 degrees to the tooth axis). Two kinds of new ceramics (Dicor and Hi-Ceram) were used for the study. The stress analysis was done by using 3-D finite element analysis program (COSMOS/M).The results were summarized as follows;1) When five points load (500N) were applied vertically on the occlusal surface, the tensile stress appeared to concentrate around loading points.2) When two points of load (200N) were applied vertically (0 degree to the tooth axis) on the buccal cusp, tensile stress concentrated around loading points. In case of using horizontal load (90 degrees to the tooth axis), however, tensile stress concentrated at the inner cervical area of buccal side of crown.3) If higher Young's Modulus value core material was used inside, the tensile stress intended to appear in the core material especially when horizontal load was applied.
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