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Comparative study of surface electromyography of masticatory muscles in patients with different types of bruxism

World Journal of Clinical Cases 2022年第20期10卷 6876-6889页

作者： Kai-Wen Lan Liu-Lin Jiang Ying Yan Hospital of Stomatology Sun Yat-sen UniversityGuangdong Provincial Key Laboratory of StomatologyGuanghua School of StomatologyGuangzhou 510080Guangdong ProvinceChina

BACKGROUND Bruxism is a rhythmic masticatory muscle activity that occurs involuntarily in a non-physiologically functional *** is a lack of research classifying the functional status of masticatory muscles in patients with different mandibular movement types(centric clenching or eccentric grinding)of *** To assess the differences of the masticatory muscle activity in patients with different types of *** A total of 21 subjects with centric bruxism(CB)and 21 subjects with eccentric bruxism(ECB)were screened from college students according to a questionnaire and their tooth wear *** subjects with no bruxism were also *** surface electromyography(EMG)signals of the temporalis anterior(TA)and superficial masseter muscle(MM)were measured in different mandibular positions and during the chewing *** EMG amplitude and chewing cycle duration parameters were then *** The CB group showed fewer muscle maximal motor units,with the MM being more pronounced,a higher proportion of muscle contractions to be recruited for the same load of chewing activity,and a longer chewing *** ECB group showed more TA maximal motor units and higher MM activity on the nonworking side in unilateral *** CB mainly affects the MM,and patients with CB show reduced masticatory muscle contraction efficiency and chewing cycle *** mainly affects the TA,and patients with ECB show enhanced contraction of non-functional lateral muscle bundles.

关键词： Bruxism Electromyography masticatory muscles Mastication Tooth wear Classification

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The electromyographic and cephalometric analyses after maxillary expansion

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Open Journal of Stomatology 2012年第4期2卷 334-339页

作者： Patrícia Maria Monteiro Simone Cecilio Hallak Regalo Janete Cinira Bregagnolo Maria Bernadete Sasso Stuani Department of Pediatric Clinics Preventive and Community DentistryDivision of OrthodonticsDental School of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil Department of Morphology Stomatology and PhysiologyDental School of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil

The purpose of this study was to evaluate the electromyographic (EMG) activity of the masseter and temporalis muscles and the skeletal and dental behavior of children having slow maxillary expansion with a quadhelix appliance. The study sample consisted of 30 children (mean age = 7 years 4 months;17 girls/13 boys) diagnosed with a unilateral posterior crossbite. Lateral cephalometric tracing and EMG analyses were carried out before orthodontic treatment (T1) and 1 month after removal of the appliance (T2). The EMG activity of the masseter and temporalis muscles was analyzed in two clinical situations: at muscular rest and during habitual chewing. Differences in the measurements were evaluated by using paired t tests. Maxillary expansion with the quadhelix appliance did not promote significant anteroposterior and vertical skeletal alterations. Among the cephalometric variables related to dental pattern, only 1-ANS-PNS values presented a significant increase at T2. At muscular rest, EMG analysis indicated a significant increase in the activity of the temporalis muscle. During habitual chewing, EMG activity decreased significantly for both evaluated muscles after removal of the quadhelix appliance. These alterations suggest an adaptation and reprogramming of the musculature to the new occlusal condition.

关键词： Electromyography masticatory muscles Malocclusion Orthodontics Interceptive

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