BACKGROUND Even though periodontal health was suggested to be not related to the traction technique, some other variables might influence the esthetic outcome of palatally displaced canines (PDC) when aligned, such as the initial position and impaction rate of the canine before treatment. The purpose of the present study was therefore to evaluate the existing correlations between periodontal health outcome of PDC after their exposure and alignment and their initial position identified according to the different rates of impaction severity. MATERIALS AND METHODS The final sample enrolled 293 PDC which satisfied inclusion and exclusion criteria. All the canines were exposed using CT by the same oral surgeon and orthodontic traction was applied using the easy cuspid device followed by fixed appliance treatment. Image analysis and periodontal status evaluation were performed for all PDCs. RESULTS α-Angle and d-distance showed no significant differences in the periodontal outcome of PDCs after treatment. The only tested variable showing significant differences was S, since canines with CEJ visible at the end of the treatment presented sectors with a mean score of 1.67, which was significantly different (P < 0.05) when compared to the S-sector for the canines that showed PD < 2 mm at the end of the treatment. CONCLUSIONS Radiographic variables as α-Angle and d-distance seem to not influence the periodontal outcome of the treated impacted canine regardless of the amount of gravity. On the contrary, S-sector might play a significant role when higher rates of gravity are present suggesting the possibility in few cases for periodontal damage at the end of treatment.

中文翻译：

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经治疗的pa移位犬的撞击严重程度对牙周结局的影响：一项回顾性研究。

背景技术尽管牙周健康被认为与牵引技术无关，但是其他一些变量可能会影响对齐时pa移位的犬齿（PDC）的美学效果，例如治疗前犬齿的初始位置和撞击率。因此，本研究的目的是评估PDC暴露和对准后牙周健康结果与根据不同影响程度的严重程度确定的初始位置之间的现有相关性。材料与方法最终样本入选293 PDC，满足纳入和排除标准。所有犬只均由同一位口腔外科医生使用CT进行暴露，并使用易弯尖的装置进行正畸牵引，然后进行固定矫治器治疗。对所有PDC进行图像分析和牙周状态评估。结果治疗后PDCs的牙周预后无α-角度和d距离的显着差异。唯一显示出显着差异的测试变量是S，因为在治疗结束时可见CEJ的犬齿的平均得分为1.67，与犬的S扇区相比，其平均得分显着不同（P <0.05）。在治疗结束时显示PD <2 mm。结论无论α角度和d距离等射线照相变量似乎都不会影响所治疗的患犬的牙周结局，无论其重力大小如何。反之，