90TH CONGRESS OF EUROPEAN ORTHODONTIC SOCIETY, Warszawa, Poland, 18 - 22 June 2014, pp.115-116
Transposition is a relatively rare dental anomaly, characterized by an interchange in the position of two adjacent permanent teeth on the same side of the dental arch. The aim of this case report was to present the treatment of a patient whose transposition of mandibular lateral incisor and canine was corrected with fixed orthodontic appliances.
The chief complaint of a female patient, aged 12 years 10 months, was the appearance of her teeth. The patient had unilateral incomplete transposition of the mandibular lateral incisor and canine. Her face was proportional and symmetric, and the profile was convex. Clinical examination showed increased overjet, overbite and Class I molar relationship on both sides. There were severe crowding and the mandibular dental midline drifted 2 millimeters to the left side. Cephalometric analysis showed a Class II skeletal relationship with vertical growth pattern and protruding incisors. Treatment objectives were to eliminate the severe dental crowding in both arches, diminish the overjet and overbite and correct the mandibular lateral incisor and canine transposition with extraction of four first premolars. Although repositioning the transposed teeth to their normal sequence in the arch is very complex and time-consuming, it was decided to align involved teeth in their correct anatomic positions to obtain a good functional and esthetic results. Clinical results at the end of the treatment were satisfactory. The mandibular lateral incisor and canine were successfully positioned. The maxillary and mandibular arches had been levelled and aligned. In centric occlusion, the dental midlines were coincident and intercuspation was adequate.
Although the duration of treatment was long, both the crowns and the roots of the transposed teeth were aligned correctly with light orthodontic forces.