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目的：观察桩核冠修复后牙不同缺损程度残冠的疗效。方法：根据牙冠缺损程度（残存洞壁数）将后牙残冠分为4类，随访观察226个后牙残冠桩核冠修复的疗效。结果：226个后牙残冠治疗后，随访观察3～7年，随访到201个，其中成功190个（成功率94．5％），失败11个；在4类缺损后牙残冠中，缺损3洞壁的Ⅲ类残冠成功率（83．9％）明显低于缺损1、2和4洞壁的Ⅰ、Ⅱ、Ⅳ类残冠；在Ⅲ类残冠中树脂桩核和纤维桩核修复的疗效略好于金属铸造桩核，前磨牙桩核冠修复的疗效略好于磨牙，但均无统计学差异（P＞0．05）。结论：后牙残冠的桩核冠修复疗效与其缺损洞壁数目有关，残存1洞壁并丧失完整肩领结构的Ⅲ类残冠修复效果最差。“,”AIM:To observe the effect of post-and-core crown in the treatment of molar residual crowns with different degree of defects.METHODS:226 residual crowns were devided into 4 types according to the defect degree of residual crowns.The crowns were restored with post-and-core crowns and 201 crowns were followed-up for 3~7 years.RESULTS:190 of the 201 teeth(94.5%)were successfully restored.The treatment success rate of re-sidual crown type Ⅲ(defects of 3 walls)was lower(83.9%)than that of other types.CONCLUSION:The effect of post-and-core crown in the treatment of residual crowns is related to the number of defected walls.The lowest success rate is produced in the treatment of Type Ⅲ residual crown.