颈牵引装置矫治替牙期安氏Ⅱ类1分类错(牙合)矫治时机的临床探讨
경견인장치교치체아기안씨Ⅱ류1분류착(아합)교치시궤적림상탐토
A study on the extraoral cervical traction in the treatment of skeletal Class Ⅱ division 1 malocclusion in mixed dentition
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