后牙大面积缺损传统多采用金属全冠进行修复，因其切割牙组织较多，使修复后的全冠固位力减低而无法修复。用铸造嵌体部分冠、利用针道、髓室和根管因位，可减少牙组织切割，尽可能地保存牙体组织，增加修复体的固位，使原来无法修复的牙齿得到修复［１］。１临床资料１．１病? Traditional large-scale defect of the posterior teeth using metal crowns to repair, because of its cutting teeth more, so that the restoration of the crown retainer reduced and can not be repaired. Cast inlay part of the crown, the use of the needle track, pulp chamber and root canal due to bit, can reduce the tooth tissue cutting, as much as possible to preserve tooth tissue, increase the retention of prosthesis, the original can not be repaired teeth to be repaired [1 ]. 1 clinical data 1.1 disease?