Twin-block功能矫正器矫治下颌后缩型安氏Ⅱ类Ⅰ分类错(牙合)的研究
Twin-block공능교정기교치하합후축형안씨Ⅱ류Ⅰ분류착(아합)적연구
Effect of treatment of class Ⅱ malocclusion with Twin-block appliances
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