Damon技术非拔牙矫治牙列拥挤患者的牙弓形态变化

Model Analysis of Non-extraction Crowding Cases Treated with Damon Ⅲ Appliance

目的探讨采用Damon技术对牙列拥挤患者进行非拔牙矫治的牙弓形态变化。方法 15例中度牙列拥挤患者,使用DamonⅢ矫治器进行非拔牙矫治。对治疗前后的记存模型进行测量分析,探讨牙弓形态的变化特点。结果矫治后的牙弓长度和宽度均有显著增加,具体的变化特点与牙列拥挤的程度和部位有关。牙弓宽度增加主要发生在上颌第一前磨牙和下颌第二前磨牙区。结论采用Damon技术非拔牙矫治牙列拥挤患者,牙弓形态改变主要是前磨牙区宽度及牙弓长度增加。

Objective To investigate the width and length change of dental arch in crowding cases treated with Damon Ⅲ appliance.Methods Dental casts of 15 non-extraction crowding cases were obtained before and after treatment with Damon Ⅲ appliance.Arch width and arch length were measured to access the effect of the appliance.Results Good result could be obtained in non-extraction crowding cases using Damon Ⅲ appliance.Arch width and arch length increased significantly after the treatment and the change related to how and where the crowding existed.Arch width increased mainly in the maxillary first premolar area and in the mandibular second premolar area.Conclusion The arch form of the 15 non-extraction crowding cases using Damon Ⅲ appliance developed in both width （mainly interpremolar width） and length.