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최명수,임주환,조인호,Choi, Myoung-Soo,Lim, Ju-Hwan,Cho, In-Ho 대한치과보철학회 1996 대한치과보철학회지 Vol.34 No.4
The accuracy and dimensional stability of impression materials are one of the most important factors for successful prosthodontic treatment. The purpose of this study was to evaluate the accuracy of several dental elastomeric impression materials used widely and clinically : Impregum-$F^{(R)},\;Permlastic^{(R)},\;Silascon^{(R)},\;Perfect^{(R)},\;Xantopren^{(R)}$. There have been many studies to evaluate the accuracy of impression materials. But it has not been decided yet, which method was most suitable for the evaluation of the accuracy. In this study, two resin teeth, #15 & 25, were prepared with rounded shoulder margin and 90 degree cavosurface angle. For the polysulfide rubber and polyether, the custom tray was made at least 24 hours prior to impression taking. For the silicone rubber materials, putty/wash impression technique was applied in taking impressions. Marginal openings of the castings on the master dies and prepared resin teeth were measured under stereomicroscope. The results were statistically analyzed and compared between tested impression materials. The results were as follows ; 1. In the overall accuracy of impression materials, polyether was the most accurate one, followed by polysulfide, additional silicone and condensation silicone. 2. On the first model pouring, condensation silicone had the largest discrepancies and there was significant difference compared to the other impression materials. 3. Polysulfide had the least discrepancies in the first model pouring, but showed larger discrepancies in the immediate second pouring than the first pouring. 4. On the immediate second pouring, the discrepancy of polyether was shown to be the smallest, while the largest one was additional silicone. 5. Polyether and polysulfide rubber using custom impression trays showed superior accuracy to silicone rubber, putty/wash impression technique.
최명수(Myung-Soo Choi),장덕종(Duck-Jong Jang ),여동준(Dong-Jun Yeo),문덕홍(Deok-Hong Moon) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The structural analysis algorithm of a rectangular plate structure is formulated by using the finite element-transfer stiffness coefficient method (FE-TSCM). This method is based on the concept of the successive transmission of the transfer stiffness coefficient method and the modeling technique of the finite element analysis. In order to confirm the validity of the FE-TSCM, bending structural analysis for a rectangular plate is carried out on a personal computer by using the FE-TSCM and the finite element method (FEM). The effectiveness of the FE-TSCM from the viewpoint of computational cost is demonstrated by comparing computational results of the FE-TSCM and the FEM.