Specific diurnal EMG activity pattern observed in occlusal collapse patients: relationship between diurnal bruxism and tooth loss progression.
Specific diurnal EMG activity pattern observed in occlusal collapse patients: relationship between diurnal bruxism and tooth loss progression.
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DOI：
10.1371/journal.pone.0101882
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Minagi S
中科院分区：
文献类型：
--
作者：
Kawakami S;Kumazaki Y;Manda Y;Oki K;Minagi S
功能旁咀嚼肌活动在牙齿脱落中的作用尚未完全阐明。本研究旨在揭示咬合塌陷患者清醒和睡眠状态下咬肌活动的特点。6名进行性咬合塌陷患者(PBC组)，6名年龄和性别匹配的对照组(MC组)，6名年轻对照组(YC组)。在患者清醒和睡眠状态下，用动态肌电记录仪连续记录咬肌肌电。使用20%的最大自愿紧握肌电阈值，将白天和夜间的副功能肌电活动分为相位性、紧张性或混合性。仅在PBC组观察到高度延长的昼夜时相活动。PBC组、MC组和YC组分别为13.29±7.18/h、0.95±0.97/h和0.87±0.98/h，差异有统计学意义(p<；0.01)。ROC曲线分析表明，昼夜相发作次数可以用来预测咬合塌陷牙齿缺失。广泛性咬合丧失可能与昼夜咀嚼肌的副功能有关，而与睡眠中的副功能无关。虽然下颌副功能与口颌系统的崩溃有关，但由于缺乏科学的方法来评估副功能活动，因此两者之间的因果关系尚未建立。这项研究使用了一种新开发的肌电记录系统，该系统可以评估咬肌全天的活动。我们的结果挑战了认为夜间磨牙症是一种强大破坏力的刻板印象。我们发现在进行性咬合塌陷患者中，昼夜位相咀嚼肌活动是最具特征的。昼夜节律性收缩的发生率可用于评估口腔颌面系统稳定性的预后。
The role of parafunctional masticatory muscle activity in tooth loss has not been fully clarified. This study aimed to reveal the characteristic activity of masseter muscles in bite collapse patients while awake and asleep. Six progressive bite collapse patients (PBC group), six age- and gender-matched control subjects (MC group), and six young control subjects (YC group) were enrolled. Electromyograms (EMG) of the masseter muscles were continuously recorded with an ambulatory EMG recorder while patients were awake and asleep. Diurnal and nocturnal parafunctional EMG activity was classified as phasic, tonic, or mixed using an EMG threshold of 20% maximal voluntary clenching. Highly extended diurnal phasic activity was observed only in the PBC group. The three groups had significantly different mean diurnal phasic episodes per hour, with 13.29±7.18 per hour in the PBC group, 0.95±0.97 per hour in the MC group, and 0.87±0.98 per hour in the YC group (p<0.01). ROC curve analysis suggested that the number of diurnal phasic episodes might be used to predict bite collapsing tooth loss. Extensive bite loss might be related to diurnal masticatory muscle parafunction but not to parafunction during sleep. Although mandibular parafunction has been implicated in stomatognathic system breakdown, a causal relationship has not been established because scientific modalities to evaluate parafunctional activity have been lacking. This study used a newly developed EMG recording system that evaluates masseter muscle activity throughout the day. Our results challenge the stereotypical idea of nocturnal bruxism as a strong destructive force. We found that diurnal phasic masticatory muscle activity was most characteristic in patients with progressive bite collapse. The incidence of diurnal phasic contractions could be used for the prognostic evaluation of stomatognathic system stability.
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影响因子：
3.6
作者：
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通讯作者：
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影响因子：
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通讯作者：
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作者：
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通讯作者：
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