Maxillary canine-first premolar transposition in the permanent dentition.

Transposition of two adjacent teeth is an eruption anomaly of uncertain etiology.1,2 Three different treatment approaches have been described: alignment of the involved teeth in their transposed positions; movement of the teeth into their normal anatomic positions; and extraction of one of the transposed teeth, followed by closure of the extraction space.3-5 The first approach is the fastest, but the second is preferred if tooth positions can be corrected without risking injury to periodontal tissue or root resorption of adjacent teeth. The third option is the most intrusive and therefore is recommended only when extraction is indicated by other factors, such as crowding and caries. This report describes the treatment of a transposition of the maxillary left canine and first premolar in a young girl.