Liu Ziang, Ouyang Yuqing, Lou Yiting, Han Yineng, Lu Mengting, Yu Mengfei, Wang Huiming, Ding Wanghui
Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou, China.
Zhejiang Provincial Clinical Research Center for Oral Diseases, Hangzhou, China.
Prog Orthod. 2025 Feb 27;26(1):8. doi: 10.1186/s40510-025-00553-7.
Orthodontically induced root resorption (OIRR) is a common side effect of orthodontic treatment. This study compares the degree of OIRR between root-filled teeth (RFT) and vital pulp teeth (VPT), and analyzes relevant study variables.
We conducted a retrospective study on 69 patients who had undergone orthodontic treatment. Using Cone-beam computed tomography (CBCT), we measured changes of root length before and after treatment through a unique method involving three-dimensional (3D) image registration and superimposition. Factors related to the OIRR such as gender, type of treatment, tooth type, age, duration of treatment and distance of root movement were considered.
The sample included 55 females and 14 males aged 27.19 ± 6.08 years. On the basis that there was no significant difference in the root movement distance between RFT and VPT, RFT showed significantly less OIRR than VPT (P < 0.05). Gender did not significantly impact on OIRR for either RFT or VPT group (P > 0.05). In women specifically, RFT displayed less resorption than VPT (P < 0.05). For treatment type, extraction cases demonstrated a lower degree of OIRR in RFT than VPT (P < 0.05), and notable greater OIRR in with-extraction group compared to no-extractions group was found in RFT (P < 0.05), but not in VPT (P > 0.05). Tooth type did not yield significant differences in OIRR overall; however, upper teeth and premolars experienced lower resorption in RFT than in VPT (P < 0.05). Cases treated with fixed appliance had higher OIRR in both RFT and VPT than those with clear aligners (P < 0.05). Age did not correlate significantly with OIRR for either group (P > 0.05). And duration of treatment positively correlated with OIRR for both types (RFT: r = 0.5506, P < 0.0001; VPT: r = 0.4371, P = 0.0002), so did root movement distance (RFT: r = 0.2955, P = 0.0140; VPT: r = 0.2790, P = 0.0206).
RFT exhibit significantly less OIRR than VPT after orthodontic treatment. Treatment type, appliance type, duration of treatment and root movement distance are significant factors influencing OIRR. Personalized orthodontic treatment plans and vigilant monitoring are crucial to mitigate OIRR risks.
正畸诱导性牙根吸收（OIRR）是正畸治疗常见的副作用。本研究比较了根管充填牙（RFT）和活髓牙（VPT）的OIRR程度，并分析相关研究变量。
我们对69例接受正畸治疗的患者进行了回顾性研究。使用锥形束计算机断层扫描（CBCT），通过一种独特的涉及三维（3D）图像配准和叠加的方法测量治疗前后牙根长度的变化。考虑了与OIRR相关的因素，如性别、治疗类型、牙位、年龄、治疗持续时间和牙根移动距离。
样本包括55名女性和14名男性，年龄为27.19±6.08岁。基于RFT和VPT之间牙根移动距离无显著差异，RFT的OIRR明显低于VPT（P<0.05）。性别对RFT或VPT组的OIRR均无显著影响（P>0.05）。具体而言，女性中RFT的吸收低于VPT（P<0.05）。对于治疗类型，拔牙病例中RFT的OIRR程度低于VPT（P<0.05），并且发现RFT中拔牙组比非拔牙组的OIRR显著更高（P<0.05），但VPT中并非如此（P>0.05）。总体而言，牙位在OIRR方面未产生显著差异；然而，RFT中上颌牙和前磨牙的吸收低于VPT（P<0.05）。使用固定矫治器治疗的病例中，RFT和VPT的OIRR均高于使用隐形矫治器的病例（P<0.05）。年龄与两组的OIRR均无显著相关性（P>0.05）。治疗持续时间与两种类型的OIRR均呈正相关（RFT：r=0.5506，P<0.0001；VPT：r=0.4371，P=0.0002），牙根移动距离也是如此（RFT：r=0.2955，P=0.0140；VPT：r=0.2790，P=0.0206）。
正畸治疗后，RFT的OIRR明显低于VPT。治疗类型、矫治器类型、治疗持续时间和牙根移动距离是影响OIRR的重要因素。个性化的正畸治疗计划和密切监测对于降低OIRR风险至关重要。
