Lin Yng-Tzer J
Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Gueishan, Taoyuan, Taiwan.
Pediatr Dent. 2013 Sep-Oct;35(5):408-10.
Dental transposition is the positional interchange of two adjacent teeth. Canine transpositions are usually accompanied by other dental anomalies, such as: impaction of the incisors; missing teeth; peg-shaped lateral incisors; severe rotation or malposition of adjacent teeth; dilacerations; and malformations. Local pathologic processes, such as tumors, cysts, retained primary canines, and supernumerary teeth, might be responsible for canine transposition. The purpose of this paper was to present a rare case of maxillary canine-to-maxillary incisor transposition in an 8-year-old girl. The patient presented with noneruption of the permanent maxillary left central incisor, and a radiographic examination revealed an impacted dilacerated incisor. The central incisor was extracted because the root was severely dilacerated. At the 3-year follow-up, an oral examination revealed that the canine had transposed to the extraction site. Through orthodontic traction, combined with reshaping of the tooth, the transposed canine was successfully positioned into the incisor position.
牙换位是指相邻两颗牙齿位置互换。尖牙换位通常伴有其他牙齿异常，如：切牙阻生；牙齿缺失；钉状侧切牙；相邻牙齿严重扭转或错位；牙折；以及畸形。局部病理过程，如肿瘤、囊肿、滞留乳牙和多生牙，可能是尖牙换位的原因。本文的目的是介绍一名8岁女孩上颌尖牙与上颌切牙换位的罕见病例。患者表现为上颌左侧恒中切牙未萌出，影像学检查显示一颗阻生且牙折的切牙。由于牙根严重牙折，拔除了中切牙。在3年随访时，口腔检查发现尖牙已换位至拔牙部位。通过正畸牵引，并结合牙齿塑形，成功将换位的尖牙定位到切牙位置。
