Aim. The aim of this study was to evaluate masticatory muscle electrical activity in patients with pain-related and pain-free temporomandibular disorders (TMDs) as well as in subjects with no TMD. Methods. Ninety children with mixed dentition were recruited to the study. Of this total, 30 subjects were diagnosed with pain-related TMD (TMD-P), 30 with pain-free TMD (TMD-PF), and 30 without TMD. We used Axis I of the Research Diagnostic Criteria for TMD (RDC/TMD) to assess the presence of TMD in the examined children. The electromyographical (EMG) potentials of the temporalis and masseter muscles were measured with a DAB-Bluetooth Instrument (Zebris Medical GmbH, Germany) at rest and during maximum voluntary clenching (MVC). Results. An analysis of the EMG recordings showed statistically significant intergroup differences in masticatory muscle electrical activity at rest and during MVC. Significantly higher rest temporalis muscle activity was noted in pain-related TMD subjects compared with that children from the pain-free TMD and non-TMD groups, as well as in TMD-PF children in relation to those without TMD. The EMG potentials of the temporalis muscle during MVC were much lower in patients with TMD-P than in pain-free TMD and non-TMD subjects. Masseter muscle activity at rest in the TMD-pain group was significantly greater, and masseter muscle EMG potentials during clenching were markedly lower than in patients with no TMD diagnosis. Conclusion. The use of electromyography to assess masticatory muscle function revealed alterations in the pattern of temporalis and masseter muscle activity in patients with pain-related TMD compared with the pain-free subjects.

中文翻译：

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肌电图作为评估疼痛相关性颞​​下颌关节疾病患者咀嚼肌活动的一种手段。

目的。这项研究的目的是评估患有疼痛相关和无疼痛的颞下颌关节疾病（TMD）的患者以及没有TMD的受试者的咀嚼肌电活动。方法。招募了90名混合牙列的儿童参加研究。在这一总数中，有30名受试者被诊断出患有疼痛相关性TMD（TMD-P），30名被诊断为无痛性TMD（TMD-PF）和30名没有TMD。我们使用了TMD研究诊断标准（RDC / TMD）的第一轴来评估被检查儿童中TMD的存在。用DAB-蓝牙仪器（Zebris Medical GmbH，德国）在静止和最大自愿握紧（MVC）期间测量颞肌和咬肌的肌电图（EMG）电势。结果。对EMG记录的分析显示，静止和MVC期间咀嚼肌电活动的统计学上显着的组间差异。与无痛TMD和非TMD组的患儿相比，与疼痛相关的TMD患儿，以及与无TMD的患儿相比，在TMD-PF患儿中，与颞骨相关的TMD患儿的颞颞肌活动明显增强。与无痛TMD和非TMD患者相比，TMD-P患者在MVC期间颞肌的EMG电位要低得多。与没有TMD诊断的患者相比，TMD疼痛组静息时的咬肌活性显着增强，并且在咬合期间咬肌肌电势显着降低。结论。使用肌电图评估咀嚼肌功能显示，与无痛受试者相比，与疼痛相关的TMD患者的颞叶和咬肌活动模式发生了改变。