Abstract
Surface tension of dental metals is important for the castability. A model for measuring surface tension of dental metal at solidification was devised and the equation was set up. Surface tension of silver copper, tin and zinc were obtained as an example. To the lower and part upper of the specimen in cylindrical shape, the Young-Laplace's formula was applied and the equation for measuring surface tension γ was obtained as follows. [numerical formula] With an argon arc furnace, metal was melted in a graphite crucible and after the metal was solidified, the curvature of the lower part of the specimen and others were measured. Then, surface tension was calculated. 1. To request the density of the metal was not necessary and the measuring was simple. 2. Only 0.4〜2.5 g of sample metal was necessary for measurement.
