Objective to investigate the effects of surgical crown lengthening on conservative restoration in anterior residual root.
目的探讨牙冠延长术对前牙残根的保存修复效果的影响。
Methods:On 38 teeth due to various crown damages or vertical fractures in subgingival lesions were performed with surgical crown lengthening in order to achieve biologic width.
方法：对38颗牙体缺损达龈下的患牙行牙冠延长术，以恢复患牙的生物学宽度。
Compared with root extraction, the direct restoration, and the crown lengthening by surgical procedure, the forced eruption is a simple, economical and practical method in clinical.
同拔出残根、直接修复和冠延长术相比，正畸(牙合)向牵引是一种简单、经济、实用的方法，值得在临床上推广。
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