Moreira-Souza Larissa, Pelai Elisa Bizetti, Bigaton Delaine Rodrigues, Freitas Deborah Queiroz, Oenning Anne Caroline Costa, Asprino Luciana
Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), São Paulo, Brazil.
Department of Oral Diagnosis, Division of Oral and Maxillofacial Surgery, Piracicaba Dental School, University of Campinas (UNICAMP), Av. Limeira, 901, Piracicaba, São Paulo, 13414-903, Brazil.
Clin Oral Investig. 2024 Jun 28;28(7):401. doi: 10.1007/s00784-024-05775-3.
This study aimed to assess whether awake bruxism and masticatory muscle activity could be related to external root resorption (ERR) in second molars adjacent to impacted mandibular third molars.
Sixty patients, with requests for a cone-beam, computed tomography, were divided into two groups: ERR (patients with ERR in the second molar, n = 30), and control group (n = 30). Awake bruxism was assessed through the Oral Behaviors Checklist (OBC) and an ecological momentary assessment (EMA). Surface electromyography (EMG) was used to assess the masseter and anterior temporal muscle function. Normality and homogeneity of variances were demonstrated. Descriptive analysis was performed, using the T-test and Chi-square test to compare the characteristics of the groups. A multiple regression model was performed.
The ERR group presented more non-functional oral activities related to awake bruxism than the control group, according to OBC (p = 0.027) and EMA (p = 0.035). In addition, the ERR group had higher EMG activity than the control group in rest and isotonic protocols (p < 0.05).
Awake bruxism and greater masticatory muscle activity seem to be related to the presence of ERR in second molars adjacent to impacted mandibular third molars.
The results of the present study can reinforce the theory that triggering ERR in the second molars adjacent to impacted mandibular third molars may be related to mechanical forces coming from the masticatory function.
本研究旨在评估清醒时磨牙症和咀嚼肌活动是否与下颌第三磨牙阻生相邻的第二磨牙的外吸收（ERR）有关。
60名要求进行锥形束计算机断层扫描的患者被分为两组：ERR组（第二磨牙有ERR的患者，n = 30）和对照组（n = 30）。通过口腔行为检查表（OBC）和生态瞬时评估（EMA）评估清醒时磨牙症。使用表面肌电图（EMG）评估咬肌和颞前肌功能。证明了方差的正态性和齐性。进行描述性分析，使用t检验和卡方检验比较两组的特征。进行多元回归模型分析。
根据OBC（p = 0.027）和EMA（p = 0.035），ERR组比对照组表现出更多与清醒时磨牙症相关的非功能性口腔活动。此外，在静息和等张方案中，ERR组的EMG活动高于对照组（p < 0.05）。
清醒时磨牙症和更大的咀嚼肌活动似乎与下颌第三磨牙阻生相邻的第二磨牙中ERR的存在有关。
本研究结果可以强化这样一种理论，即下颌第三磨牙阻生相邻的第二磨牙中引发ERR可能与来自咀嚼功能的机械力有关。
