Objective Discussing the selection and effect after cosmetic prosthesis for the patients who perform crownlengthening after superior anterior tooth injury.
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。
2
Objective to investigate the effects of surgical crownlengthening 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。
3
Compared with root extraction, the direct restoration, and the crownlengthening by surgical procedure, the forced eruption is a simple, economical and practical method in clinical.