In mesialization of canines and distal segments of dentition during the treatment of missing lateral incisors, first premolar moves into the esthetically and functionally prominent place in the canine curve of the dental arch. When preparing the treatment plan, an orthodontist and aɸspecialist in esthetic dentistry decide on whether it is appropriate to intrude first upper premolar into the place of canine in order to achieve optimum course of the gingiva line, and whether to mesiorotate in order to achieve the optimum position of the tooth long axis.
Necessary adjustment of first premolars into the shape of canines is based on the extent of intrusion, shapes of palatal and vestibular cusps, and esthetics of the resulting smile. The complex interdisciplinary management must consider the limitations and cooperation of the patient.