Three-Dimensional Assessment of Maxillary Canine Retraction With and Without Power Arm

Inclusion Criteria: * Class II div 1 patients with age range between 14 to 25 years * patients indicated for maxillary first premolar extraction * increased over jet * mild or no crowding in maxilla * no previous orthodontic treatment * no history of periodontal disease or bone loss * good oral hygiene * no systemic disease * absence of canine morphological abnormalities. Exclusion Criteria: * patients not indicated for maxillary first premolar extraction * decreased or no over jet * moderate or severe crowding in maxilla * previous orthodontic treatment * history of periodontal disease or bone loss * bad oral hygiene * systemic disease * canine morphological abnormalities.