Relationship between severity of periodontitis and masseter muscle activity during waking and sleeping hours
Relationship between severity of periodontitis and masseter muscle activity during waking and sleeping hours
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DOI：
10.1016/j.archoralbio.2018.02.021
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发表时间：
2018-06-01
影响因子：
3
通讯作者：
Minagi, Shogo
中科院分区：
文献类型：
--
作者：
Kato, Seiya;Ekuni, Daisuke;Minagi, Shogo
目的：探讨咬肌活动与牙周炎严重程度的关系。设计：16例无牙周炎或轻度牙周炎患者(NMP组)和15例中重度牙周炎患者(MSP组)。用牙龈卟啉单胞菌作为细菌抗原，检测血浆中的抗体效价。当患者清醒和睡眠时，使用可移动的表面肌电记录装置连续记录咬肌的表面肌电信号。采用5%-10%最大主动咬合(MVC)、10%-20%MVC和20%MVC的强度分析咬肌活动。此外，采用20%MVC的肌电水平作为分析时相、紧张性和混合性肌电活动的阈值。咬肌活动和磨牙症发作的累积持续时间以每小时持续时间计算。结果：两组患者血浆抗牙周炎抗体滴度差异无统计学意义(p=0.423)。在清醒时，MSP组咬肌活动强度为20%MVC的持续时间明显长于NMP组(p=0.037)。在睡眠时间内，MSP组在所有MVC强度下的咬肌活动持续时间显著长于NMP组(均P<；0.05)。此外，在清醒和睡眠状态下，MSP组的阶段性发作和混合性发作的持续时间明显长于NMP组(均P<；0.05)。结论：本研究结果提示咬肌活动可能与牙周炎的严重程度有关。
Objective: This study was conducted to investigate whether the masseter muscle activity shows any specific pattern in relation to the severity of periodontitis.Design: Sixteen subjects with no or mild periodontitis (NMP group) and 15 subjects with moderate or severe periodontitis (MSP group) were enrolled. Plasma IgG antibody titer was examined using Porphyromonas gingivalis as a bacterial antigen. Surface electromyography (EMG) of the masseter muscles was continuously recorded using an ambulatory surface EMG recording device while patients were awake and asleep. Masseter muscle activity was analyzed using intensities of 5%-10% maximal voluntary clenching (MVC), 10%-20% MVC, and > 20% MVC. Furthermore, EMG levels of 20% MVC were adopted as the threshold for analysis of phasic, tonic, and mixed EMG activities. The cumulative duration of masseter muscle activity and bruxism episodes was calculated as duration per hour.Results: There was no significant difference in plasma IgG antibody titers against P. gingivalis between the NMP and MSP groups (p = 0.423). During waking hours, the duration of masseter muscle activity with an intensity of > 20% MVC was significantly longer in the MSP group than in the NMP group (p = 0.037). During sleeping hours, the duration of masseter muscle activity at all MVC intensities was significantly longer in the MSP group than in the NMP group (all p < 0.05). Additionally, the duration of phasic and mixed episodes was significantly longer in the MSP group than those in the NMP group while both awake and asleep (all p < 0.05).Conclusions: The results of this study suggested that masseter muscle activity might be related to the severity of periodontitis.