改良式唇挡矫治替牙期安氏Ⅱ类1分类错(牙合)的临床研究
개량식진당교치체아기안씨Ⅱ류1분류착(아합)적림상연구
Clinical research of improved lip bumper in treatment of Class Ⅱ division 1 malocclusions
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