Rapid canine distalization through distraction of the periodontal ligament after reducing interseptal bone resistance

Objective To investigate the effect of rapid canine distulization through distraction of the periodontal ligament after reducing interseptal bone resistance. Methods Twenty canines in 11 patients who needed lirst premolar extractions were involved. A tooth-borne, custom-made distractor was bonded right after the first premolar extraction and the interseptal bone resistance reduction. Three days post-operatively,the distractor was activated 0.1 mm three times a day. Orthodontic models, panoramic radiographs,periapical radiographs, electrical vitality test were assessed pre- and post distraction procedure and 3 months after the completion of the procedure. Results The distraction procedure was completed in 18 to 35 days [mean (25.6 ± 4.7) days], with the distal displacement of the canines ranging from 3.53 to 8.29 nun[mean (5.56 ± 1.32) mm]. The canines showed a mean of 12. 20° distal tipping and 18.53° rotation. The anchorage teeth showed an average of (0.76 ± 0.75)mm mesial movement. The mesial contact point of incisors showed a mean of (0.67 ± 0.55) mm lingua] movement. There was no significant root resorption or long-time change on pulp vitality after distraction. Conclusions The canine distalization through distraction of the periodontal ligament after reducing interseptal bone resistance was an effective approach to move canines rapidly. Key words: Tooth movement;  Cuspid;  Reducing interseptal bone resistance