下颌前伸矫治器-3治疗安氏Ⅱ类错牙合后软组织侧貌变化的研究
하합전신교치기-3치료안씨Ⅱ류착아합후연조직측모변화적연구
Clinical effects on treatment of patients with classⅡmalocclusion by mandibular protraction appliance
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