[Frequency of transposition and its treatment at the Department of Pedodontics and Orthodontics of Semmelweis University in the last five years].

Tooth transposition is a rare but severe disturbance of tooth eruption. The maxillary canine and the premolar are the most commonly transposed teeth. The occurrence of transposition in the mandible is very rare. The transposition may occur in combination with other anomalies, like aplasia (40%), peg-shaped lateral incisor (25%), deciduous tooth retention (50%). The adjacent teeth exchange positions in the dental arch for genetic or traumatic reasons. In the last five years orthopantomograms of 2736 patients were analysed at the Department of Pedodontics and Orthodontics of Semmelweis University. Twelve transposition cases (0.43%) were found: 10 in the upper and 2 in the lower dental arch. Only one case was bilateral transposition. Nine patients were treated with fixed appliance. In one of these cases the transposed tooth was extracted and two patients are being observed. The methods of treatment are in accordance with the international guide-lines.