关键词: 正畸支抗, 微种植体支抗, 安氏Ⅱ类1分类

Abstract: Objective The purpose of this study was to evaluate the treatment results and clinical treatment method of Angel’s Class Ⅱ1 malocclusion cases by the application of microscrews anchorage. Methods The study comprised 11 patients from Orthodontic Department of Jining Stomatology Hospital from the year 2005 to 2008. All the patients presented with maxillary protrusion or little mandible intrusion treated with MBT straight wire appliance by extraction of premolars. Self-drilling microscrews were impanted in the bilateral buccal alveolar bone between the maxillary first molars and second premolar before bonding straight wire appliance.Upper canines were ligated backward to the microscrews in the initial treatment.When the main arch was stable enough，the frontal teeth were retracted together with the microscrews anchorage 1.5 to 2N force each side was added to microscrews and retracted teeth. The average treatment time was 19 months， and follow-up lasted 1 year after the treatment .The cephalometric films before and after the treatment were measured and compared. Results Angel’s Class Ⅱ1 malocclusion in 11 patients were corrected effectively， except for 1 failure case. First molars had no significant changes in anteroposterior and vertical directions. Patients’ facial profile had been improved greatly. After the treatment， SNA、 ANB、 FH to U1 and IMPA angle decreased significantly. Furthermore SNB increased a little ，but FMA decreased a little. Neither of them had significant changes. Conclusion Angel’s Class Ⅱ1 malocclusion can be treated effectively by microscrew anchorage， with no loss of molar anchorage.

Key words: orthodontic anchorage, microscrew anchorage, Angel’s Class Ⅱ1 malocclusion