With 3 years following study,each 1 case failed for root or crown fracture,2 teeth failed for crown loose in the metal cast post core group with 92.9% success rate.

• 经过3年的跟踪观察；铸造桩核出现1个牙根折；1个牙冠折；2个牙修复体松动脱落；成功率为92.；9%25。