成人与青少年均角型安氏Ⅱ类1分类错(牙)拔牙矫治的对比研究
성인여청소년균각형안씨Ⅱ류1분류착(아)발아교치적대비연구
Study on Class Ⅱ division 1 teenage patients with average-angle in adolescents and adults after four first premolars-extraction
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