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目的:拔除上颌第二磨牙后远移第一磨牙,观察其远移的效果和第三磨牙自行调整的情况。方法:选择牙性安氏II类错牙合,上颌牙列中度拥挤病例10例,下颌轻度拥挤或大体正常,年龄16~20岁。拔除上颌第二磨牙后1周开始用Ni-Ti推簧推第一磨牙远移,同时观察第三磨牙自行向第二磨牙位置迁移的情况。所有病例均采用国产MBT直丝弓矫治器。结果:10例安氏II类错牙合均矫正为安氏I类咬合关系,上颌牙列拥挤解除,第一磨牙远移显著。8例患者上颌第三磨牙自行迁移至第二磨牙的位置并建立正常咬合关系。2例后期用矫治器使其矫治至正常位置。结论:选择合适的适应症和年龄,拔除上颌第二磨牙后,第一磨牙均能远移至预期位置,第三磨牙绝大多数能自行迁移至理想的位置。临床显示此方法是矫治安氏牙性II类错牙合比较有效的方法。
OBJECTIVE: To observe the effect of distal movement of the maxillary second molars and the third molars after adjustment. Methods: Dental Class II malocclusion was selected. Ten cases of moderate crowding of the maxillary dentition were selected. Their mandibles were slightly crowded or generally normal, aged from 16 to 20 years. One week after removal of the maxillary second molar, Ni-Ti push was used to push the first molar away and the third molar was observed to migrate to the second molar. All cases are made using domestic MBT straight wire appliance. Results: All 10 cases of Class II malocclusion were corrected to Angle Class I occlusion. The maxillary dentition was crowded and the first molars were displaced far. In 8 patients, the third maxillary third molar migrated to the second molar and established a normal occlusion relationship. 2 cases with orthodontic appliance to make it normal position. Conclusion: After choosing the appropriate indications and age, the first molars can be moved far to the expected position after removing the second molars. Most of the third molars can migrate to the ideal position. This method is clinically proven to be the most effective method to correct Class II malocclusion.