头帽肌激动器与双(牙合)板矫治器矫治安氏Ⅱ1类错(牙合)的比较研究
두모기격동기여쌍(아합)판교치기교치안씨Ⅱ1류착(아합)적비교연구
A comparative study of the mechanism of the headgear Activator and Twin-block in the treatment of AngleⅡ1 malocclusion
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