Begg及Edgewise矫治器减数治疗安氏Ⅱ类1分类错(牙合)的硬组织变化及其稳定性
Begg급Edgewise교치기감수치료안씨Ⅱ류1분류착(아합)적경조직변화급기은정성
The differences of hard tissue changes and stability of Angle's Class Ⅱ division 1 extraction cases treated by Begg appliance and Edgewise appliance
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