自锁托槽和传统托槽对上颌切牙牙根外吸收影响的回顾性研究
자쇄탁조화전통탁조대상합절아아근외흡수영향적회고성연구
A retrospective study of external apical root resorption of maxillary incisors in patients treated with conventional or self-ligating brackets
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