Dental casting alloys are the principal material for fixed prosthetic restorations. No other material has the combination of strength,modulus, wear resistance, and biologic compatibility that a material must have to survive long term in the mouth as a fixed prosthesis. As a wide range of metals and alloys combination are now available, it is necessary for us to have the complete knowledge about the alloys being used. This book compiles the composition, properties and biocompatibility of the constituent metals of the alloys, to be able to choose them for the required applications.