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PURPOSE : An alloy for dental casting which has excellent corrosion resistance and biological stability, good bio-compatibility and superior mechanical and dynamical properties in the oral cavity by containing nickel, chromium and molybdenum as principal components even without containing beryllium is provided. CONSTITUTION : An alloy for dental casting comprises 20 to 23 wt.%% of Cr, 7 wt.%% of Mo, 2 to 4 wt.%% of Si, 1 to 3 wt.%% of Al, 1 to 4 wt.%% of Nb, 0.08 wt.%% or less of La-rich rare metal, and the balance of Ni and other elements. A composition for the other elements except Ni is any one of a first alloy group comprising 20Cr7Mo3Si1.5Al, 20Cr7Mo3Si1.5Al1Nb and 20Cr7Mo3Si1.5Al2Nb, and a second alloy group comprising the alloys of the first alloy group to which 0.05 wt.%% of the La-rich rare metal is additionally added. © KIPO 2007