Transposition of bilateral maxillary canine and first premolar

The following case report describes the treatment of a 16-year-old female patient with complete transposition of maxillary first premolars and canines. Retained deciduous maxillary canines and buccal eruption of permanent maxillary canines led to non-consonant smile arc of the patient and obliteration of buccal corridors. Mechanics for correction were individualized based on factors such as facial pattern, age, malocclusion, tooth-size discrepancy, stage of eruption, and magnitude of the transposition. Thus an attempt was made to align transposition by maintaining order of transposed canine and first premolar and attain a consonant smile arc with a normal buccal corridor width.