前方牵引器与FR-Ⅲ矫治安氏Ⅲ类错牙合比较研究
전방견인기여FR-Ⅲ교치안씨Ⅲ류착아합비교연구
A study of the comparative effect with anterior crossbits of reverse headgear and Frankel Ⅲ
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