Pattern material is used to make rudiment of casting in fixed prosthesis. With the need for casting precision, people take more attention to the quality of pattern material. Contractility and rigidity of pattern material would make great influence on the Marginal adaptation and Distortion of crown.At present, there are few research report about the pattern Marginal adaptation, the pattern distortion and the pattern material found capability. In this study, we pay more attention to the influence of different...