Department of Orthodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang, Liaoning, China.
Department of Epidemiology, School of Public Health, China Medical University, Shenyang, Liaoning, China.
Am J Orthod Dentofacial Orthop. 2021 Dec;160(6):814-824. doi: 10.1016/j.ajodo.2020.06.043. Epub 2021 Sep 2.
The objective of this study was to investigate the effects of dehiscence and fenestration on external apical root resorption (EARR) in maxillary incisors.
Seventy-eight patients were selected for this study. We set dehiscence, fenestration, sex, extraction, or nonextraction, tooth position, initial age, and duration of treatment as independent variables and EARR as the dependent variable. General statistical descriptions for these variables were made by mean, standard deviation and occurrence rates, etc. To make the data visualization and find more information, 2 heat maps were made. Generalized estimation equation analysis was performed to determine associations between EARR and independent variables.
The occurrence rates of dehiscence and fenestration in maxillary incisors were 14.77% and 10.74%, respectively. The average value of EARR was 1.09 ± 0.87 mm in this study. Dehiscence, tooth position, extraction, initial age, and duration had significant correlations with EARR. The ratio of exponent B was 1:1.643 for dehiscence and nondehiscence, whereas fenestration and sex had no significant association with EARR.
The amount of EARR at maxillary incisors in patients with dehiscence before orthodontic treatment might be less than that in patients without it, and different incisors might have different contributions to it. However, the low value of exponent B for dehiscence meant that there might be other unknown factors that were involved in this study.
本研究旨在探讨上颌切牙裂隙和开窗对牙体外部根尖吸收（EARR）的影响。
本研究共选取了 78 名患者。我们将裂隙、开窗、性别、拔牙或不拔牙、牙齿位置、初始年龄和治疗时间作为自变量，EARR 作为因变量。采用均值、标准差和发生率等对这些变量进行了一般统计描述。为了使数据可视化并找到更多信息，我们制作了 2 个热图。采用广义估计方程分析来确定 EARR 与自变量之间的关联。
上颌切牙裂隙和开窗的发生率分别为 14.77%和 10.74%。本研究中 EARR 的平均值为 1.09±0.87mm。裂隙、牙齿位置、拔牙、初始年龄和治疗时间与 EARR 有显著相关性。裂隙的指数 B 比值为 1:1.643，而非裂隙的比值为 1:1.643，而开窗和性别与 EARR 无显著相关性。
正畸治疗前上颌切牙有裂隙的患者 EARR 可能少于无裂隙的患者，不同的切牙可能对此有不同的贡献。然而，裂隙的指数 B 值较低意味着可能有其他未知因素参与了本研究。
