Objective To investigate curative effect by fiber post-core crown restoration after crown lengthening for upper anterior teeth residual root. Methods A total of 20 upper anterior fractured, or decayed to subgingival 2~4 mm teeth were repaired by fiber post-core and all-ceramic crown restoration on subgingival fracture surface after crown lengthening. Results There were 12 patients (19 teeth) received successful operation, along with good postoperative condition and successful crown restoration. Shallow defect group (10 teeth) had higher instant satisfaction degree as (9.5±0.3) points than (9.3±0.3) points of deep defect group (9 teeth) (P>0.05). The difference of mean plaque index and periodontal pocket depth had no statistical significance between shallow defect group and deep defect group (P>0.05), while the difference of their mean bleeding index and gingival index had statistical significance (P<0.05). Conclusion Fiber post-core and all-ceramic crown restoration shows precise repair effect after crown lengthening for upper anterior teeth residual root.%目的：探讨上前牙缺损位于龈下的残根使用冠延长术后，行纤维桩冠修复的疗效。方法对上前牙折断或龋坏至龈下2~4 mm 的20颗牙，采用冠延长术暴露出龈下断面后采用纤维桩核及全瓷冠修复。结果12例患者(19颗牙)均顺利完成手术，术后一般情况良好，顺利完成了桩核冠的修复。浅缺损组(10颗牙)修复后即刻患者满意度为(9.5±0.3)分高于深缺损组(9颗牙)的(9.3±0.3)分 (P>0.05)。浅缺损组和深缺损组残根修复后的平均菌斑指数、牙周袋深度比较(P>0.05)；平均出血指数、牙龈指数比较(P<0.05)。结论前牙残根冠冠延长术能暴露根面，纤维桩及瓷全冠后可以达到良好地修复效果。
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