目的：研究使用牙支抗式牵张器行上颌骨牵张成骨术后牙髓和牙周的组织学改变。
AIM: to observe the changes in dental pulp and periodontal tissues under the application of distraction osteogenesis using tooth-attached intraoral distracter.
目的研究使用牙附着式牵张器行上颌牙槽骨牵张成骨术后牙髓和牙周的组织学改变。
Objective to observe the changes in dental pulp and periodontal tissues under the application of maxillary tooth-bone distraction osteogenesis using tooth-attached intraoral distractor.
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