不同前磨牙拔除模式对安氏Ⅰ类病例软硬组织A点影响的研究
불동전마아발제모식대안씨Ⅰ류병례연경조직A점영향적연구
Study of effects of different premolar extraction patterns on point A of skeletal and soft tissue in class Ⅰ cases
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