The vast majority of cast metal full crowns are clinically applied to posterior teeth, mainly to restore the chewing function of the posterior dentition. Specifically as follows: 1, if the posterior tooth body defect is too large for filling treatment, the filling of the retention force is insufficient, the resistance shape does not meet the clinical requirements, the filling effect is not ideal or unsuccessful, you can choose to cast metal full crown restoration; 2, posterior gingival height is not enough, the crown is very small, or the gap between the neighboring teeth and the neighboring teeth is too large, or poor neighboring relations, in this case, in order to restore its neighboring relations And shape, form of the situation, you can also choose to cast metal full crown; 3, the posterior teeth for root canal surgery, or crown fracture for tooth half-cut, or a large area of missing teeth, you can also choose to cast metal full crown to repair.4, fixed partial denture, periodontal splints retainer.5, cryptocleft teeth.