A study on the changes of the posterior segments between before, after treatment and postretention period through maxillary expansion therapy (상악궁 확장술을 통한 치료전, 후 및 보정후 상악 구치부 변화에 관한 연구)
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- The korean journal of orthodontics
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- v.27 no.1
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- pp.55-63
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- 1997