抄録
A metal-ceramic crown used in the clinical stage is manufactured by burning 3 layers of the dental porcelain on the metal coping. Then the deformation of the crown occurs by a hardening shrinkage and thermal shrinkage of dental porcelain. Therefore, a study on deformation of the metal coping in production process of metal-ceramic crowns has been done by using the finite element method (FEM). As a result, the following conclusions were obtained. : (1) Neighborhoods of ends of the collar extended into outsides of the crown. In particularly, the largest deformation was observed at ends of the collar. (2) Extension of neighborhoods of end of the collar increased with increasing the length of the collar. (3) The thickness of the first layer of the dental porcelain was largely influenced in the deformation of the metal coping.
