Department of Stomatology, Shaoxing People's Hospital, Shaoxing, China.
Department of Orthodontic, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, China.
BMC Oral Health. 2019 Mar 29;19(1):53. doi: 10.1186/s12903-019-0743-3.
The relationship between orthodontic treatment-related factors and EARR has never been fully answered. The aim of this study was to investigate whether conventional and passive self-ligating brackets affect the amount and severity of external apical root resorption (EARR) in withdrawal patients.
Ninety-eight patients were selected from department of orthodontic, hospital of stamotology, Wenzhou medical university. Patients received treatment with either a conventional edgewise appliance (n = 49, Mini, 3 M Unitek, USA) or a passive self-ligating bracket system (n = 49, Damon, Ormco, USA). EARR of the maxillary incisors was evaluated on panoramic radiographs at the before and end of orthodontic treatment, respectively. Intergroup comparisons of root resorption were performed with Mann-Whitney tests. The univariate and multivariate regression model was used to assess the appliance type, age, sex and duration of treatment on EARR.
There was no significant difference in the amount of EARR between the two groups was found. Age and gender were not association with EARR, however, EARR was positively correlated with treatment duration.
The type of bracket did not influence the occurrence and severity of the external apical root resorption in class I extraction patients.
正畸治疗相关因素与 EARR 之间的关系尚未得到充分解答。本研究旨在探讨传统和被动自锁托槽是否会影响拔牙患者的外吸收根（EARR）量和严重程度。
本研究从温州医科大学附属口腔医院正畸科选取 98 例患者。患者分别接受传统直丝弓矫治器（n=49，Mini，3M Unitek，美国）或被动自锁托槽系统（n=49， Damon，Ormco，美国）治疗。分别在正畸治疗前和结束时的全景片上评估上颌切牙的 EARR。采用 Mann-Whitney 检验对根吸收进行组间比较。采用单变量和多变量回归模型评估矫治器类型、年龄、性别和治疗时间对 EARR 的影响。
两组 EARR 量无显著差异。年龄和性别与 EARR 无关，但 EARR 与治疗时间呈正相关。
在 I 类拔牙患者中，托槽类型不会影响外吸收根的发生和严重程度。
