Document Type : Original Article
Authors
1 Assistant Professor of Orthodontics Department, School of Dentistry, Shiraz University of Medical Sciences
2 Orthodontist
Abstract
Introduction: In this investigation, the distal movement of maxillary canine through distraction of periodontal ligament was clinically evaluated. In addition, a newly designed retraction device was developed and evaluated.Materials and Methods: This study was carried out on 10 patients who were selected through a selective available sampling procedure, in the orthodontic department of Shiraz Dental School. Removal of interseptal bone and extraction of upper first premolars were performed at the same time for each patient. Then a rigid, segmental, tooth-borne appliance was designed and used to rapidly retract canines 0.75mm per day.Results: After analyzing radiographs, dental casts and clinical findings, it was shown that the anchorage units were able to withstand the retraction force with minimal anchorage loss(0.10+0.25mm) and the canines were retracted (6.25+0.75mm) into the extraction space within 2-3 weeks. Distal movement of canines were associated with a few tippings which were within acceptable limits a few tippings in all orthodontic movements such as tooth sliding and ororthodontics associated corticotomy. New alveolar bone was generated and remodeled rapidly in the mesial side of the canine during and after distraction. No clinical and radiographic evidence of periodontal defects or endodontic lesions was observed throughout and after distraction.Conclusion: This method can be considered as a useful method instead of routine ones because of reduction in treatment duration, rapid tooth movement and anchorage control without patient cooperation.Key words: Rapid retraction, Distraction, Anchorage
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