...替牙期；上颌中切牙重度扭转；改良Nance弓附牵引钩；2×4矫治技术；早期矫治 [gap=1308]Key words] Dental transitional period；Maxillary central incisor severe torsion；Modified Nance arch attaching towing h..
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...键词】 “2×4”矫治技术;替牙期;前牙反牙合;Ⅲ类颌间牵引 [gap=1257]Key Words: "2×4" technique；Dental transitional period；Anterior crossbite；Intermaxillary traction (class Ⅲ) ..
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