This study was investigated the loss of a noble alloy during the fabrication of metal bond porcelain crowns. Weight losses resulting from (1) the casting process and cleaning of the casting (2) sprue removal, (3) seating of the easting onto the die, and (4) preparation for poreelain addition were invested using 159 crowns. The percentage weight losses were 9.80%, 16.46%, 35.69% and 38.05%, respectively. Weight losses were generally higher for maxillary restoration, but metal bond porcelain restoration an anterior teeth registered significantly higher losses than those for premolars and molars.