When a traditional method is used to repair residual dental root with horn-shaped orifice, this kind of dental root often has to be extracted since the success rate in clinic is very low.

• 根管口呈喇叭形的残根用传统桩核修复时,常由于剪力集中在颈部和根尖,使得根管口薄壁不能承受较大的压力,在临床上因修复成功率较低,只能将牙根拔除。