牙冠延长术；根牵引术；牙龈切除术；龈沟深度。
The crown extension technique; The root hauling technique; The gum excision; The depth of gingival sulcus.
摘要：目的比较牙冠延长术与牙龈切除术用于残根残冠桩冠修复中的疗效。
Abstract: Objective to compare the restorative effects of crown lengthening surgery and gingivectomy on dowel crown of deep-seated subgingival teeth fracture.
结论：牙龈切除术与牙冠延长术应用于牙体劈裂达龈下较深部位患牙均能明显改善龈袋深度，而后者的临床疗效优于前者。
Conclusion: Both gingivectomy and prolongation of dental crown could shorten the depths of the gingival pocket. The clinical effect of the latter is better than that of the former.
结论：牙龈切除术与牙冠延长术应用于牙体劈裂达龈下较深部位患牙均能明显改善龈袋深度，而后者的临床疗效优于前者。
Conclusion: Both gingivectomy and prolongation of dental crown could shorten the depths of the gingival pocket. The clinical effect of the latter is better than that of the former.
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