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      Relação entre dor e atividade elétrica na presença de bruxismo Translated title: Relation between pain and electric activity in the presence of bruxism

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          Abstract

          OBJETIVO: mensurar a atividade elétrica dos músculos masseter e temporal, verificar a graduação de dor à palpação e sua correlação com a atividade elétrica em sujeitos com bruxismo. MÉTODO: todos os sujeitos do estudo foram selecionados após avaliação por meio do instrumento Critérios de Diagnóstico em Pesquisa para Desordens Temporomandibulares (RDC/TMD) além de avaliação odontológica e fonoaudiológica. A atividade elétrica dos músculos mastigatórios foi avaliada por meio da eletromiografia de superfície nas situações de repouso, máxima intercuspidação e mastigação habitual ritmada. Para a coleta e análise dos sinais eletromiográficos foram usados os Software BioInspector®, 1.8 (Lynx®), e software AqDAnalysis®. 7.0 (Lynx®), respectivamente, quantificados em RMS (raiz quadrada média) e expressos em µV (microvolts). A análise estatística dos dados foi realizada por meio do Coeficiente de Spearman com significância de p<0,05. RESULTADOS: os resultados mostraram que o padrão eletromiográfico dos músculos estudados apresentou-se próximos aos níveis de normalidade, no repouso, máxima intercuspidação e na mastigação habitual ritmada. A maioria dos sujeitos apresentou queixa de algum tipo de dor, sendo mais evidenciado o grau severo e, principalmente, no músculo masseter. Não evidenciou-se correlação estatisticamente significante entre dor e atividade EMG, uma vez que esta última mostrou-se próxima aos níveis de normalidade. CONCLUSÃO: a análise dos resultados indicou que, apesar da presença da dor nos músculos mastigatórios, a maioria das correlações entre dor e EMG apresentou-se fraca e sem significância estatística, indicando que a dor não interferiu no desempenho da atividade elétrica dos músculos estudados nas situações avaliadas.

          Translated abstract

          PURPOSE: to measure the electric activity of the masseter and temporal muscles, to verify the graduation of the pain to palpation and its correlation with the electric activity in subjects with bruxism. METHOD: all subjects were examined according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) instrument combined with the dentistry and the speech pathology evaluation. The electric activity in the masticatory muscles was measured based on surface electromyography in the following situations: during rest, maximum intercuspation and during usual mastication rhythmic. In the collection and analysis of the electromyography signals, it was used BioInspector®, 1.8 (Lynx®), and AqDAnalysis®, 7.0 (Lynx®), and the data were quantified on RMS (root mean square) and expressed in µV (microvolts). The statistic analysis was based on the Spearman Coefficient with 5% significance level. RESULTS: the results showed that EMG pattern of the studied muscles was found next to the levels to normality in the rest, maximum intercuspidation and in the rhythmic habitual mastication. Most of the subjects with bruxism had a complaint of some pain, being more evidenced the severe degree and mainly in the masseter muscle. There was not evidenced statistically significant correlation between pain and activity EMG, once that this last one was next to the normality levels. CONCLUSION: the analysis of the results indicated that in spite of the presence of pain in the masticatory muscles, most of the correlations between pain and EMG were weak and without statistical significance, indicating that pain did not intervene with the performance of the electric activity of the studied muscles in the evaluated situations.

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          Does masticatory muscle hyperactivity occur in individuals presenting temporomandibular disorders?

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            Bruxismo do sono

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              Electromyographic analysis of the masseter and buccinator muscles with the pro-fono facial exerciser use in bruxers.

              The aim of this study was to evaluate the efficiency of the Pró-Fono Facial Exerciser (Pró-Fono Productos Especializados para Fonoaudiologia Ltda., Barueri/SP, Brazil) to decrease bruxism, as well as the correlation between the masseter and the buccinator muscles using electromyography (EMG). In this study, 39 individuals ranging from 23 to 48 years of age were selected from a dental school and then underwent surface EMG at three different periods of time: 0, 10, and 70 days. They were divided into a normal control group, a bruxer control group (without device), and an experimental bruxer group who used the device. The bruxer group showed a greater masseter EMG amplitude when compared to the normal group, while the experimental group had deceased activity with a reduction in symptoms. The buccinator EMG spectral analysis of the experimental bruxist group showed asynchronous contractions of the masseter muscle (during jaw opening) after using the Pró-Fono Facial Exerciser. The normal group also showed asynchronous contractions. Upon correlation of the data between these muscles, the inference is that there is a reduction in bruxism when activating the buccinator muscle.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rcefac
                Revista CEFAC
                Rev. CEFAC
                CEFAC Saúde e Educação (São Paulo )
                1982-0216
                June 2011
                : 13
                : 3
                : 399-406
                Affiliations
                [1 ] Universidade Federal de Santa Maria Brazil
                [2 ] Universidade Federal de Santa Maria Brazil
                [3 ] Universidade Federal de Santa Maria Brazil
                [4 ] Universidade Federal de Santa Maria Brazil
                Article
                S1516-18462011000300002
                10.1590/s1516-18462011005000026
                a765e103-9b98-4fff-80b7-f4f9675be6a1

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-1846&lng=en
                Categories
                REHABILITATION

                Physiotherapy
                Bruxism,Electromyography,Masticatory Muscles,Facial Pain,Bruxismo,Eletromiografia,Músculos Mastigatórios,Dor facial

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