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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目的：观察在烤瓷牙体制备同时行牙冠延长术这一方法对牙龈美观改善的效果和对牙龈健康的影响。

Objective: to study the effect of tooth preparation, meanwhile elongating the crown, on improvement of gingival aesthetics and gingival health after ceramic prosthesis.

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目的：对于上前牙外伤后行牙冠延长术的患者，探讨其术后美容性修复方法的选择及其效果。

Objective Discussing the selection and effect after cosmetic prosthesis for the patients who perform crown lengthening after superior anterior tooth injury.

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