Abstract: Objective：To investigate the stress distributions in an all-ceramic crown of the upper central incisor with different core ceramics under load. Methods：The 3-dimensional finite element model of layered crown was constructed using CAD software. This crown model was made with gold, zirconia, and alumina core and veneering porcelains. A loading simulating the maximum bite force (200 N) was applied to the crown at different locations (incisal edge, lingual fossa, lingual margin). The stress values of full crown was calculated and expressed, as stress intensity, in MPa. Results：The simulation showed that, the tendency of stress distributions in an all-ceramic crown with different core materials was similar. The MPS (maximal principal stress) value was located in the region submitted to the load and the proximal margin. As the elastic modulus of core materials increased, the maximal stress value of von Mises in veneer decreased, however that in core increased. Moreover, the MPS in core/veneer interface, core/tooth preparation interface, and proximal margin increased, but the MPS in veneer decreased. Conclusions：The use of core materials with high elastic modulus would reduce the risk of veneer chipping.

Key words: All-ceramic crown, 3-dimensional finite element, Core ceramic, Veneer, Stress distribution