Orthodontic management of bilateral maxillary canine-first premolar transposition and bilateral agenesis of maxillary lateral incisors: a case report

INTRODUCTION: Maxillary canine-first premolar transposition (Mx.C.P1) is an uncommon dental positional anomaly that may create many orthodontic problems from both esthetic and functional points of view. OBJECTIVE: In this report we show the orthodontic management of a case of Mx.C.P1 associated with bilateral maxillary lateral incisor agenesis and unilateral mandibular second premolar agenesis METHODS: The patient was treated with a multibracket appliance and the extraction of the lower premolar. RESULTS: treatment was completed without the need for any prosthetic replacement.

引言：上颌尖牙-第一前磨牙易位（Maxillary canine-first premolar transposition，Mx.C.P1）是一种少见的牙列位置异常，可从美学与功能维度引发诸多正畸临床问题。
研究目的：本研究旨在报告一例合并双侧上颌侧切牙先天缺失与单侧下颌第二前磨牙先天缺失的上颌尖牙-第一前磨牙易位病例的正畸诊疗方案。
治疗方法：患者接受多托槽矫治器联合下颌前磨牙拔除术治疗。
治疗结果：本次治疗未实施任何义齿修复即顺利完成。