摘要
目的评价拔除下颌第二磨牙治疗安氏Ⅲ类错[牙合]的临床效果及远期的稳定性。方法选择在我院正畸科拔除下颌第二磨牙矫治的安氏Ⅲ类错[牙合]病例15例。患者年龄14-25岁，平均年龄16．4岁，对治疗结果进行临床分析，并在矫治结束后追踪观察，结果对于某些安氏Ⅲ类错[牙合]，患者面型平直或轻度Ⅲ类骨面型、下前牙直立，而下前牙又需要内收改善面型的病例，若双侧下颌第三磨牙牙胚形态、大小、位置正常，可采取拔除下颌第二磨牙同时配合Ⅲ类颌间牵引的方法获得Ⅰ类[牙合]关系及理想的侧貌骨面型，2年以上的追踪观察显示疗效基本稳定。结论对于牙性或轻度骨性的安氏Ⅲ类错[牙合]，拔除下颌第二磨牙，远中直立倾斜第一磨牙及下牙列可矫正近中磨牙关系，改善Ⅲ类骨面型，实现面部美观和牙颌功能的统一。
Objective To investigate the clinical effects of the extraction of mandibular second molars on the treatment of Class Ⅲ malocclusion. Methods 15 Class Ⅲ cases treated with the extracton of mandibular second molars were selected, age ranged from 14 to 25 years, the average of 16.4 years. Cephalograms, study casts and photos of pretreatment and posttreatment were obtained for all patients. Results For light/medium skeletal Class Ⅲ malocclusion with straight profile and straight lower anterior teeth, mandibular second molars extraction would be an optimum orthodontic design. Conclusions For light/medium skeletal Class Ⅲ malocclusion, mandibular second molars extraction would not only correct molar relationship, but maintain the normal anterior teeth torque and improve soft tissue profile.
关键词
第二磨
牙安氏Ⅲ类错[牙合]
正畸
skeletal Class Ⅲ malocclusion
second molar extraction
orthodontic treatment
