A radiograph shows that a maxillary canine and lateral incisor have exchanged positions in the arch. What is this condition called?

Transposition is a rare dental anomaly in which two adjacent teeth have exchanged their positions in the arch. The most common transposition is between the maxillary canine and first premolar, or between the canine and lateral incisor. Radiographically, the roots of the transposed teeth occupy the positions expected of the adjacent teeth. This is different from ectopic eruption, which involves a tooth erupting in an abnormal location without complete exchange with an adjacent tooth.