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Recently, the laser welding has gradually been applied as a joining method for dental alloys. Therefore, this study was conducted to develop a welding method for preventing laser welding deformation. In this study, the influence of the fixed strength on the prevention of welding deformation was examined by fixing Ag-Pd-Cu-Au alloy specimen with a soldering investment or silicone rubber. Moreover, the effectiveness of post-heat treatment after welding on the welding deformation prevention was examined. In addition, the deformation result of the laser welding was compared with that of soldering.The conclusions were as follows:1. It was effective to compensate for transverse shrinkage to expand joint gap considering the degree of the shrinkage by setting expansion of soldering investment on fixing specimens there with.2. The strong fixation of specimens with soldering investment could reduce welding deformation.3. Post-heat treatment of the specimen fixed by investment was effective in preventing the deformation.

Prevention of Laser Welding Deformation for Dental Prosthesis. Effects of Investment Fixation and Heat Treatment.