Abstract：
OBJECTIVE: 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.
METHODS: 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.
RESULTS: 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).
CONCLUSIONS: 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.
CONCLUSIONS: 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.
METHODS: 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.
RESULTS: 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).
CONCLUSIONS: 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.
CONCLUSIONS: 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.
摘要：
目的：本研究旨在评估清醒磨牙症和咀嚼肌活动是否与邻近下颌第三磨牙的第二磨牙的外部牙根吸收（ERR）有关。
方法：60例患者，对锥形束的要求，计算机断层扫描,分为两组：ERR（第二磨牙有ERR的患者，n=30),对照组(n=30)。通过口腔行为清单（OBC）和生态瞬时评估（EMA）评估了清醒磨牙症。表面肌电图（EMG）用于评估咬肌和颞前肌功能。证明了方差的正态和同质性。进行描述性分析，采用T检验和卡方检验比较各组的特征。进行多元回归模型。
结果：ERR组比对照组表现出更多与清醒磨牙症相关的非功能性口腔活动，根据OBC（p=0.027）和EMA（p=0.035）。此外,在休息和等渗方案中，ERR组的EMG活性高于对照组（p<0.05）。
结论：清醒磨牙症和更大的咀嚼肌活动似乎与邻近下颌第三磨牙的第二磨牙存在ERR有关。
结论：本研究的结果可以加强以下理论：在邻近下颌第三磨牙的第二磨牙中触发ERR可能与来自咀嚼功能的机械力有关。
方法：60例患者，对锥形束的要求，计算机断层扫描,分为两组：ERR（第二磨牙有ERR的患者，n=30),对照组(n=30)。通过口腔行为清单（OBC）和生态瞬时评估（EMA）评估了清醒磨牙症。表面肌电图（EMG）用于评估咬肌和颞前肌功能。证明了方差的正态和同质性。进行描述性分析，采用T检验和卡方检验比较各组的特征。进行多元回归模型。
结果：ERR组比对照组表现出更多与清醒磨牙症相关的非功能性口腔活动，根据OBC（p=0.027）和EMA（p=0.035）。此外,在休息和等渗方案中，ERR组的EMG活性高于对照组（p<0.05）。
结论：清醒磨牙症和更大的咀嚼肌活动似乎与邻近下颌第三磨牙的第二磨牙存在ERR有关。
结论：本研究的结果可以加强以下理论：在邻近下颌第三磨牙的第二磨牙中触发ERR可能与来自咀嚼功能的机械力有关。
