Orthodontic treatment of transposition of permanent mandibular lateral incisor and left canine in mixed dentition: a case report.

The purpose of this study was to present the orthodontic treatment of a unilateral transposition of a permanent mandibular left canine and permanent mandibular lateral incisor during middle transitional dentition in a 10-year-old female. A panoramic radiograph showed the apex of the permanent mandibular left lateral incisor to be resting on the mesial corner of the permanent mandibular left canine crown, which was ectopically erupted in the proximity of the primary mandibular left second molar. A removable appliance was used to upright the permanent mandibular left lateral incisor, after which a utility arch was used until full eruption of the permanent dentition. Treatment continued with a fixed appliance system that included all teeth until the transposition of the canine and lateral incisor was corrected and a class I occlusion with a favorable smile was obtained (at 36 months).