本文在外伤后6个月到2年的时间内追察15例20个根形成期冠折露髓的恒前牙,对照组分别行活髓切断术,根管治疗,观察其牙根形态发育情况。病例选择1987年至1990年来我院门诊治疗的7至10岁儿童,恒前牙外伤冠折露髓,X片显示无根折,根发育在2/3左右,根管粗大,根尖孔未形成,根端尚无病变影像的牙齿并且初诊、复诊均在本院本科进行,按正规操作治疗,复诊时临床无自主症状。 In this paper, after traumatic injury from 6 months to 2 years, 15 cases of 20 anterior root crowns with uncinate coronal pulp formation were observed, and the control group were treated with live pulp and root canal therapy respectively to observe the morphological changes of root morphology . Case selection From 1987 to 1990 in our hospital outpatient treatment of 7 to 10-year-old children, constant anterior teeth traumatic crown dew pulp, X-ray showed no root fracture, root development in about 2/3, root canal thick, apical foramen Formed, there is no root of the lesion image of the teeth and the newly diagnosed, referral are undergraduate hospital, according to the formal operation and treatment, referral clinical symptoms.