2004 Volume 24 Issue 2 Pages 139-152
Recently, castable ceramic crowns are being utilized clinically, but their strength has been raised as a problem. Thus, for the purpose of clarifying whether the hardness of adhesive resin cement affects the strength of CASMIC crown, we luted CASMIC crowns with adhesive resin cement with different Young's moduli, then varied loading directions and loading points and investigated comparatively the internal stresses induced in the CASMIC crown, anchor tooth and peripheral tissues, using the three-dimensional finite element stress analysis.
As a result, the effects of different Young's moduli of the resin cement on the tensile stress induced in CASMIC crown changed when the loading point, measuring point and loading direction were changed. In addition, under such a loading condition as causing a strong tensile stress in CASMIC crown, the greater was Young's modulus, the smaller was the tensile stress, suggesting that the CASMIC crown would clinically have a smaller risk of fracturing when the Young's modulus of luting cement is large. In addition, the greater was the Young's modulus of the cement, the smaller was the effects to the dentin around the pulp. The magnitude of the Young's modulus of the cement little effects the periodontal ligament.
