Ranta R
I Department of Surgery, Helsinki University Central Hospital, Finland.
ASDC J Dent Child. 1989 Sep-Oct;56(5):366-70.
Six patients with transposed tooth germ before root formation are reported in cases with cleft lip or palate. A boy with complete bilateral cleft lip and palate had a maxillary permanent canine displaced posteriorly in the vomer. A girl with cleft palate had an upwards and distally transmigrated maxillary canine. Two girls with cleft palate had a transposed maxillary canine with the first premolar. One patient had a maxillary second premolar migrated between the first and second permanent molar, and another had the germ of a supernumerary maxillary premolar between the first and second permanent molars. The follow-up findings concerning the development of the teeth and treatment are described; they are also discussed in the light of present theories on the etiology of tooth transposition.
报告了6例牙根形成前牙胚移位的唇腭裂患者。一名双侧完全性唇腭裂男孩的上颌恒尖牙向后移位至犁骨。一名腭裂女孩的上颌尖牙向上并向远中移位。两名腭裂女孩的上颌尖牙与第一前磨牙发生移位。一名患者的上颌第二前磨牙移位至第一和第二恒磨牙之间，另一名患者在第一和第二恒磨牙之间有一颗额外的上颌前磨牙牙胚。描述了关于牙齿发育和治疗的随访结果；还根据目前关于牙齿移位病因的理论进行了讨论。
