Abstract
Metal-ceramic crowns used in the clinical stage are manufactured by baking the dental porcelain on the metal coping. The deformation of the metal-ceramic crown is effected with the dental porcelain, because of a thermosetting shrinkage of the dental porcelain in the baking. Therefore, study of deformation properties of the metal-ceramic crown due to the baking of the dental porcelain had been done by using the finite element method (FEM). As a result, the following conclusions were obtained, (l) Neighborhoods of ends of the collar extended into out sides. In particularly, the largest deformation was observed on ends of the collar. (2) Extension of neighborhoods of end of the collar increased with increasing the length of the collar. (3) Extension in the neighborhood of ends of the collar and shrinkage in the regions except those increased with increasing the thickness of the dental porcelain. Moreover, these results good agreed with results that were discussed by Nakamura, et'al.
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