Effect of micro-implant anchorage combined with selective extracting maxillary first molar on second orthodontic treatment of malocclusion

Abstract

Objective To analyze the clinical effect of both micro-implant anchorage and selec tive extracting maxillary first molar to correct the failure of orthodontics. Methods From January 2006 to June 2012, 24 cases who suffered from failure of orthodontics were treated in this department. To all patients, bilateral maxillary first molars were extracted, and micro-implant anchorage were planted into maxilla from buccal alveolar ridge to correct malocclusion acting as anchorages. Lateral cephalometric radiographs, intraoral photograph and facial photograph of every patient were taken he fore and after treatments; Their over bite and overjet molar relationship and incisors retraction were compared before and after treatments. Methods All the micro implant anchorages were sucessfuly im planted except two patients who experienced second operation owing to luxation of three implants. All the molars were strengthed and the profile improved along with their normal over bite and overjet. Conclusions The treatment of using micro-implant anchorage and selective extracting maxillary first molar is an ideal option of second orthodontics. Unconventional tooth extraction is used in this treat ment. Micro implant anchorages are stable, acceptable and effective in clinical application. Key words: Orthodontics; Correction; Micro implants anchorage; Molar; Tooth extro-cion ; Malocclusion