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Ageing and surface EMG activity patterns of masticatory muscles

CECILIO, F. A.; REGALO, S. C. H.; PALINKAS, M.; ISSA, J. P. M.; SIESSERE, S.; HALLAK, J. E. C.; MACHADO-DE-SOUSA, J. P.; SEMPRINI, M.
Fonte: WILEY-BLACKWELL PUBLISHING, INC Publicador: WILEY-BLACKWELL PUBLISHING, INC
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.82%
P>The purpose of this study was to evaluate the influence of age on the electromyographic activity of masticatory muscles. All volunteers were Brazilian, fully dentate (except for Group I - mixed dentition), Caucasian, aged 7-80, and divided into five groups: I (7-12 years), II (13-20 years), III (21-40 years), IV (41-60 years) and V (61-80 years). Except for Group V, which comprised nine women and eight men, all groups were equally divided with respect to gender (20 M/20 F). Surface electromyographic records of masticatory muscles were obtained at rest and during maximal voluntary contraction, right and left laterality, maximal jaw protrusion and maximal clenching in the intercuspal position. Statistically significant differences (P < 0 center dot 05) were found in all clinical conditions among the different age groups. Considerably different patterns of muscle activation were found across ages, with greater electromyographic activity in children and youth, and decreasing from adults to aged people.; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[2006/60965-6]

Implant-supported prosthesis following Branemark protocol on electromyography of masticatory muscles

BERSANI, E.; REGALO, S. C. H.; SIESSERE, S.; SANTOS, C. M.; CHIMELLO, D. T.; OLIVEIRA, R. H. de; SEMPRINI, M.
Fonte: WILEY-BLACKWELL Publicador: WILEY-BLACKWELL
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.82%
This research evaluated the effects of Branemark protocol on electromyography of the masseter and temporal muscles. The patients were divided into two groups: Group 1: patients who wore an implant-supported prosthesis in the mandibular arch following Branemark protocol, and maxillary removable complete dentures; Group II: dentate individuals (control). Electromyography was carried out at rest, right (RL) and left (LL) laterality, protrusion and maximum voluntary contraction (MVC). Data were compared by t-test. At rest, a higher electromyographic (EMG) activity was observed in Group I, and the values were significant in the right masseter and left temporal muscles. In RL, there were statistically significant differences for right masseter (P < 0.01), left masseter and temporal muscles and for the left temporal muscle in LL (P < 0.05). In protrusion, Group I presented a higher EMG activity, and there was a statistically significant difference for the right masseter muscle (RM) (P < 0.05). In MVC, the EMG values were higher in Group II (control), but significant just for the right temporal muscle (P < 0.05). In conclusion, individuals with mandibular fixed dentures supported according to the Branemark protocol and maxillary removable complete dentures showed a higher activity of masticatory muscles during the mandibular postural clinical conditions examined; however...

Caracterização da distribuição da miosina rápida, lenta e híbrida na musculatura da mastigação; Characterization of fast, slow and hybrid fibers in masticatory muscles

Guimarães, Thatiana Bastos
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 26/10/2009 PT
Relevância na Pesquisa
66.94%
Introdução: Os músculos da mastigação masseter, temporal, pterigóideo medial e pterigóideo lateral são componentes essenciais do sistema estomatognático. A mastigação decorre da movimentação destes músculos. Além da função fisiológica, os músculos da mastigação estão envolvidos na disfunção temporomandibular (DTM) que é importante causa de dor, sons articulares e função mandibular irregular ou limitada. As DTM representam a maior causa de dor não dental na região orofacial, sendo a causa muscular a mais prevalente. O conhecimento detalhado da composição estrutural e funcional dos músculos da mastigação é fundamental para a compreensão dos mecanismos da DTM muscular. Objetivos: Analisar a distribuição da expressão das isoformas de miosina (rápida e lenta) e, a quantidade de fibras híbridas nos músculos temporal e masseter em material de autópsia da 1a a 9a décadas. Casuística e métodos: Foram estudadas 37 amostras dos músculos temporal e masseter (20 amostras do sexo masculino e 17 do sexo feminino) de autópsias do Serviço de Verificação de Óbitos de São Paulo com intervalo pós-mortem de até 18 horas, de ambos os gêneros e com idades divididas por décadas (1a a 9a décadas). Resultados: Não houve diferença estatística significante na porcentagem de fibras rápidas...

Análise da musculatura mastigatória de crianças com diferentes graus de severidade de DTM: avaliação eletromiográfica, ultrassonográfica e da força de mordida; Analysis of the masticatory muscles in children with several levels of TMD: electromyographic and ultrasonographic evaluation and bite force determination

Dias, Taiana de Melo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 15/06/2009 PT
Relevância na Pesquisa
67%
A DTM agrupa um número de sinais e sintomas envolvendo os músculos da mastigação, a ATM e estruturas associadas. Estudos epidemiológicos relatam que tais sinais e sintomas podem ser encontrados em todas as faixas etárias, inclusive na infância e na adolescência. A hipertonicidade muscular, assim como a fraqueza dos músculos mastigatórios, estão associadas à DTM, e seu monitoramento é uma forma de verificar as condições do sistema estomatognático. Considerando-se que qualquer desequilíbrio entre os elementos do sistema estomatognático pode repercutir na harmonia morfofuncional de uma criança ou adolescente, o objetivo do presente trabalho foi analisar a atividade eletromiográfica e a espessura muscular dos músculos masseter e temporal e a força de mordida molar máxima de crianças com diferentes graus de severidade de DTM, e comparar com as avaliações resultantes de crianças que não apresentam sinais e sintomas desta disfunção. Foram avaliados 93 indivíduos, entre 7 e 11 anos de idade, em atendimento na FORP-USP. Com base no Índice de Disfunção Clínica de Helkimo e nos critérios de inclusão e exclusão, foram constituídos 4 grupos, (G1 controle, G2 DTM leve, G3 DTM moderada, G4 DTM severa), somando um total de 45 crianças. Os registros eletromiográficos foram realizados durante o repouso e atividades que envolveram a participação ativa da musculatura mastigatória...

Correlação clínica e termográfica do ponto-gatilho miofascial nos músculos da mastigação; Thermographic and clinical correlation of myofascial trigger points in the masticatory muscles

Haddad, Denise Sabbagh
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 09/08/2011 PT
Relevância na Pesquisa
66.74%
A síndrome dolorosa miofascial (SDM) é uma disfunção musculoesquelética não articular caracterizada por pontos-gatilho miofasciais. Estes pontos, identificados por meio da palpação, são descritos como bandas tensas na fibra muscular, podendo apresentar dor referida à compressão. Sabe-se que os pontos-gatilho miofasciais provocam hiperatividade simpática regional de temperatura local devido à atividade vasoconstritora cutânea. Para documentação objetiva por imagem desta alteração funcional, a termografia tem sido proposta como método auxiliar diagnóstico. O objetivo deste estudo foi correlacionar os exames clínico e termográfico dos pontos-gatilho nos músculos da mastigação masseter e temporal parte anterior. A amostra constituiu-se por 26 mulheres voluntárias com 41 ± 15 anos. Os resultados demonstraram correlação diretamente proporcional entre algometria e termografia na avaliação do ponto-gatilho miofascial, onde, quanto menor a força aplicada, menor a temperatura local (p<0,001). As áreas com dor referida apresentaram níveis de limiar de dor à pressão (1.28±0.45 kgf) menores quando comparados às áreas de dor local (1.73±0,59 kgf; p<0.001). Sendo assim, a imagem termográfica de um ponto-gatilho apresentou-se hiporradiante quando comparada à região de ausência de ponto-gatilho (ΔT>0...

Anatomical aspects of the masticatory muscles of the tufted capuchin (Cebus apella)

Madeira, M. C.; de Oliveira, J. A.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 35-44
ENG
Relevância na Pesquisa
66.74%
The description of the macroscopic structure of the masticatory muscles is based upon the dissection of 26 adult and juvenile tufted capuchin monkeys (Cebus apella) of both sexes. A detailed description of the temporal, masseter and medial and lateral pterygoid muscles on each side of the head is given. Not only the general shape, origin and insertion are described, but also the architectonic organization, i.e. the stratiform disposition of the muscle parts. Anatomical variations in each sex or age appear to be few and unimportant. Anatomical aspects are found to be essentially similar to those found in other primates including man; however some characteristics differences do exist and deserve special comment.

Histoenzymology and morphometry of the masticatory muscles of tufted capuchin monkey (Cebus apella Linnaeus, 1758)

Andreo, J. C.; Oliveira, J. A.; Navarro, J. A. C.; Roque, D. D.; Roque, J. S.; Buchain, R. L.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 33-42
ENG
Relevância na Pesquisa
56.9%
Samples of the anterior and posterior regions of the masseter and temporal muscles and of the anterior belly of the digastric muscle of 4 adult male tufted capuchin monkeys (Cebus apella) were removed and stained with HE and submitted to the m-ATPase reaction (with alkaline and acid preincubation) and to the NADH-TR and SDH reactions. The results of the histoenzymologic reactions were similar, except for acid reversal which did not occur in fibers of the fast glycolytic (FG) type in the mandibular locomotor muscles. FG fibers had a larger area and were more frequent in all regions studied. No significant differences in frequency or area of each fiber type were detected, considering the anterior and posterior regions of the masseter and temporal muscles. The frequency of fibers of the fast oxidative glycolytic (FOG) and slow oxidative (SO) types and of FOG area differed significantly between the anterior belly of the digastric muscle and the mandibular locomotor muscle. The predominance of fast twitch (FG and FOG) fibers and the multipenniform and bipenniform internal architecture of the masseter and temporal muscles, respectively, are characteristics that permit the powerful bite typical of tufted capuchin monkeys.

Test-retest reliability of electromyographic variables of masseter and temporal muscles in patients with cerebral palsy

Giannasi, Lilian Chrystiane; Matsui, Miriam Yumi; Politti, Fabiano; Batista, Sandra Regina F.; Caldas, Bruna F.; Amorim, Jose Benedito O.; Franco de Oliveira, Luis Vicente; Oliveira, Claudia Santos; Gomes, Monica Fernandes
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 1352-1358
ENG
Relevância na Pesquisa
56.84%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Introduction: The aim of this study was to evaluate the reliability of surface electromyography of the masticatory muscles in patients with cerebral palsy.Methods: Surface electromyography was performed over the masseter and temporal muscles in 15 patients with cerebral palsy with the mandible at rest and during maximum clenching effort in two sessions. The data were analyzed using the root mean square amplitude, mean frequency, median frequency, zero crossings and approximate entropy.Results: In the within-day evaluations, intraclass correlation coefficients were higher (0.80-0.98) for the all electromyography variables and muscles during maximum clenching effort. In the resting position, the coefficients revealed good to excellent reliability (0.61-0.95) for root mean square, mean frequency, median frequency and zero crossings and fair to good reliability (0.53-0.74) for approximate entropy. In the between-day evaluations, the coefficients revealed good to excellent reliability (0.60-0.86) for mean frequency, median frequency, zero crossings and approximate entropy. In the resting position, the coefficients revealed poor to fair reliability (0.23-0.57) for all electromyography variables studied. The root mean square had the highest standard errors during maximum clenching effort (2.37-5.91) and at rest (1.47-6.86).Conclusion: Mean frequency...

Serotonergic neurons in the caudal raphe nuclei discharge in association with activity of masticatory muscles

Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1997 EN
Relevância na Pesquisa
66.69%
There is a dense serotonergic projection from nucleus raphe pallidus and nucleus raphe obscurus to the trigeminal motor nucleus and serotonin exerts a strong facilitatory action on the trigeminal motoneurons. Some serotonergic neurons in these caudal raphe nuclei increase their discharge during feeding. The objective of the present study was to investigate the possibility that the activity of these serotonergic neurons is related to activity of masticatory muscles. Cats were implanted with microelectrodes and gross electrodes. Caudal raphe single neuron activity, electrocorticographic activity, and splenius, digastric and masseter electromyographic activities were recorded during active behaviors (feeding and grooming), during quiet waking and during sleep. Seven presumed serotonergic neurons were identified. These neurons showed a long duration action potential (>2.0 ms), and discharged slowly (2-7 Hz) and very regularly (interspike interval coefficient of variation <0.3) during quiet waking. The activity of these neurons decreased remarkably during fast wave sleep (78-100%). Six of these neurons showed tonic changes in their activity positively related to digastric and/or masseter muscle activity but not to splenius muscle activity during waking. These data are consistent with the hypothesis that serotonergic neurons in the caudal raphe nuclei play an important role in the control of jaw movements

Stretch reflexes in the human masticatory muscles: A brief review and a new functional role

Miles, T.; Flavel, S.; Nordstrom, M.
Fonte: Elsevier Science BV Publicador: Elsevier Science BV
Tipo: Artigo de Revista Científica
Publicado em //2004 EN
Relevância na Pesquisa
66.9%
Stretch reflexes play a vital role in fine-tuning movements and in automatically maintaining posture. This article briefly reviews the operation of the stretch reflex in the human masticatory system. The conventional approach of stretching muscles in an open-loop manner has yielded much valuable information on the operation of this reflex. In particular, it has revealed that stretching the jaw-closing muscles evokes a reflex response with two major components. The short-latency reflex is favoured when stretches are brisk, but slower stretches evoke an additional long-latency component. In the hand muscles, the long-latency response is transcortical: in the masticatory muscles, it is not. In addition to its role in servo-control of muscle length during chewing, the stretch reflex in the jaw-closing muscles maintains the vertical position of the mandible during vigorous head movements such as those that occur during running, jumping, hopping and other vigorous whole-body movements in which the head moves briskly up and down. This is an interesting model system in which to investigate stretch reflexes with natural stimuli under unrestrained, physiological conditions.; T.S. Miles, S.C. Flavel and M.A. Nordstrom; Copyright © 2004 Elsevier B.V. All rights reserved.

Motor cortical control of human masticatory muscles

Nordstrom, M.; Miles, T.; Gooden, B.; Butler, S.; Ridding, M.; Thompson, P.
Fonte: Elsevier Science Publicador: Elsevier Science
Tipo: Artigo de Revista Científica
Publicado em //1999 EN
Relevância na Pesquisa
66.74%
The trigeminally innervated masticatory muscles elevate and depress the mandible and are involved in chewing, swallowing, and speech. The motor cortex has been implicated in the initiation and subsequent control of movement of the mandible through descending corticobulbar projections to the trigeminal motor nuclei, but there are few details on the organization or operation of this pathway in humans. This chapter uses unilateral focal transcranial magnetic stimulation (TMS) to examine the nature of the projections from motor cortex to jaw-closer (masseter) and jaw-opener (anterior digastric) motoneuron pools in humans. Responses evoked by TMS in masseter and anterior digastric muscles are studied at both the whole-muscle and single motor-unit levels to provide information regarding (1) the existence of bilateral projections to the motor pools from a single hemisphere, (2) the relative strength of excitatory projections from the ipsi- and contra-lateral hemisphere, (3) the capacity for differential control of a single motor pool through the corticobulbar projection from each hemisphere, and (4) the nature of the corticobulbar projections to trigeminal motoneurons (mono- or oligosynaptic).; Michael A. Nordstrom, Timothy S. Miles, Benjamin R. Gooden...

Afferent and cortical control of human masticatory muscles

Miles, T.; Nordstrom, M.
Fonte: Kluwer Academic/Plenum Publishers; New York Publicador: Kluwer Academic/Plenum Publishers; New York
Tipo: Parte de Livro
Publicado em //2002 EN
Relevância na Pesquisa
66.88%
Like most other muscles, the human masticatory muscles are controlled by descending signals from the cortex and other supraspinal structures, as well as afferent signals arising in receptors in muscles, skin and other tissues. However, the special functional roles of the masticatory system, and in particular the fact that the muscles on both sides are usually used together, has led to some special adaptations of function.

Masticatory muscles of the great-gray kangaroo (Macropus giganteus)

Tomo, S.; Tomo, I.; Townsend, G.; Hirata, K.
Fonte: John Wiley & Sons, Inc. Publicador: John Wiley & Sons, Inc.
Tipo: Artigo de Revista Científica
Publicado em //2007 EN
Relevância na Pesquisa
66.85%
The great-gray kangaroo (Macropus giganteus) belongs to the Diprotodontia suborder (herbivorous marsupials of Australia) of the order of marsupials. We dissected the masticatory muscles in the great-gray kangaroo and classified them based on their innervation. Three (two male and one female) adult great-gray kangaroos (M. giganteus), fixed with 10% formalin, were examined. The masseter muscle of the great-gray kangaroo was classified into four layers (superficial layers 1, 2, 3, and a deep layer), all innervated by masseteric nerves. Layer 1 of the masseter muscle was well developed and the deep layer inserted into the masseteric canal. The zygomaticomandibular muscle, which belongs to both the masseter and temporalis muscles, was innervated by both the masseteric nerve and posterior deep temporal nerve, and the temporalis muscle was innervated by the anterior and posterior deep temporal nerves. The medial pterygoid muscle, which was innervated by the medial pterygoid nerve, was divided into superficial and deep portions. The lateral pterygoid muscle was divided into superior and inferior heads by the buccal nerve. We propose that the relationship of the masticatory muscles in the kangaroo has evolved by passive anterior invasion of the deep layer of the masseter by the medial pterygoid muscle via the masseteric canal...

Insights into the bilateral cortical control of human masticatory muscles revealed by transcranial magnetic stimulation

Nordstrom, M.
Fonte: Pergamon-Elsevier Science Ltd Publicador: Pergamon-Elsevier Science Ltd
Tipo: Artigo de Revista Científica
Publicado em //2007 EN
Relevância na Pesquisa
66.82%
In this brief review I describe details of the functional organisation of the bilateral corticobulbar projections to the trigeminally innervated masticatory muscles, as revealed by transcranial magnetic stimulation of the human brain. The motor cortices of both hemispheres are involved in control of trigeminal motoneurons, however the contralateral hemisphere has the greater excitatory influence. Corticomotoneuronal cells in each hemisphere project to jaw-closer and jaw-opener motoneurons. Less is known about cortically mediated inhibitory effects in the trigeminal motor system, but the available evidence suggests that drive to jaw muscles on each side is affected similarly by intracortical inhibitory processes activated in one hemisphere. Functional studies reveal that the two hemispheres play distinct roles in control of ipsilateral and contralateral muscles, particularly for jaw-closers. Masseter and digastric motor units recruited during low-force contractions do not receive uniform inputs from each hemisphere; the majority of masseter motor units are excited only from the contralateral hemisphere, and while digastric motor units are usually excited from both hemispheres the direct CM cell influence appears to be augmented on the contralateral side by corticobulbar activation of segmental excitatory interneurons. Differences in bilateral cortical control of jaw-closer and jaw-opener muscles may contribute to the more independent control of jaw-closers on each side during functional tasks. Corticobulbar control of the trigeminal muscles during natural tasks such as chewing and speech remains to be investigated with TMS.; http://www.elsevier.com/wps/find/journaldescription.cws_home/203/description#description; Michael A. Nordstrom; Copyright © 2006 Elsevier Ltd All rights reserved.

Electromyographic activity of sternocleidomastoid and masticatory muscles in patients with vestibular lesions

Tartaglia,Gianluca M.; Barozzi,Stefania; Federico,Marin; Cesarani,Antonio; Ferrario,Virgilio F.
Fonte: Faculdade De Odontologia De Bauru - USP Publicador: Faculdade De Odontologia De Bauru - USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2008 EN
Relevância na Pesquisa
66.88%
This study evaluated the electromyographic characteristics of masticatory and neck muscles in subjects with vestibular lesions. Surface electromyography of the masseter, temporalis and sternocleidomastoid muscles was performed in 19 patients with Ménière's disease, 12 patients with an acute peripheral vestibular lesion, and 19 control subjects matched for sex and age. During maximum voluntary clenching, patients with peripheral vestibular lesions had the highest co-contraction of the sternocleidomastoid muscle (analysis of covariance, p=0.02), the control subjects had the smallest values, and the patients with Ménière's disease had intermediate values. The control subjects had larger standardized muscle activities than the other patient groups (p=0.001). In conclusion, during maximum voluntary tooth clenching, patients with vestibular alterations have both more active neck muscles, and less active masticatory muscles than normal controls. Results underline the importance of a more inclusive craniocervical assessment of patients with vestibular lesions.

Effect of conventional TENS on pain and electromyographic activity of masticatory muscles in TMD patients

Rodrigues,Delaine; Siriani,Anamaria Oliveira; Bérzin,Fausto
Fonte: Sociedade Brasileira de Pesquisa Odontológica - SBPqO Publicador: Sociedade Brasileira de Pesquisa Odontológica - SBPqO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2004 EN
Relevância na Pesquisa
66.82%
Temporomandibular disorders (TMD) are characterized by several signs and symptoms, such as pain and changes in the electrical activity of masticatory muscles. Considering that transcutaneous electrical nerve stimulation (TENS) is a resource indicated to promote analgesia, the objective of this study was to evaluate the effect of TENS on pain and electromyographic (EMG) activity of the jaw elevator muscles in TMD patients. This study evaluated 35 female volunteers: 19 TMD patients (mean age = 23.04 ± 3.5) and 16 normal subjects (mean age = 23.3 ± 3.0). Transcutaneous electrical nerve stimulation (conventional mode, 150 Hz) was applied once to each group for 45 minutes. Surface electromyography (gain of 100 times and 1 kHz sampling frequency) and the visual analogue scale (VAS) were applied before and immediately after TENS application. Both VAS data and root mean square (RMS) values were analyzed using Student's t-test. The TMD group, compared to the control group, showed higher EMG activity of the jaw elevator muscles at rest. No difference was observed between the groups regarding maximum voluntary clenching (MVC). In TMD patients, TENS reduced both pain and EMG activity of the anterior portion of the temporal muscle...

Lamination of the Masticatory Muscles in the Phascolarctos cinereus (Koala) According to Their Innervations

Nakajima, K.; Townsend, G.
Fonte: Okajima Foria Anatomica Yaponika Henshubu Publicador: Okajima Foria Anatomica Yaponika Henshubu
Tipo: Artigo de Revista Científica
Publicado em //2009 EN
Relevância na Pesquisa
66.95%
The masticatory muscles are usually classified into four groups: masseter, temporalis, lateral pterygoid and medial pterygoid. The communicating muscle bundle between the temporalis and masseter called the zygomaticomandibular muscle exists. The laminations within these muscles are commonly separated by aponeuroses. Nerves control the action of muscles, so improved understanding about innervation patterns in the masticatory muscles is important in the consideration of muscle function. In this study, we focus on the relationships between the nerves supply and the lamination of masticatory muscles in Phascolarctos cinereus (Koala). The masseter muscle consists of superficial and deep muscle layers. The superficial muscle layer of the masseter muscle is divided into rostro-lateral and caudo-internal nerve layers. The deep muscle layer of the masseter muscle is divided into rostral, rostro-lateral, medial and caudo-internal nerve layers. The nerves that innervate the zygomaticomandibular muscle are distributed to the lateral area of the coronoid process. The temporalis muscle was divided into internal layer of the coronoid process, a lateral layer of the coronoid process and a posterior layer by the nerve distribution pattern. The medial pterygoid muscle divided into rostro-internal...

Electromyographic activity of sternocleidomastoid and masticatory muscles in patients with vestibular lesions

Tartaglia, Gianluca M.; Barozzi, Stefania; Federico, Marin; Cesarani, Antonio; Ferrario, Virgilio F.
Fonte: Universidade de São Paulo. Faculdade de Odontologia de Bauru Publicador: Universidade de São Paulo. Faculdade de Odontologia de Bauru
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; Formato: application/pdf
Publicado em 01/12/2008 ENG
Relevância na Pesquisa
66.88%
This study evaluated the electromyographic characteristics of masticatory and neck muscles in subjects with vestibular lesions. Surface electromyography of the masseter, temporalis and sternocleidomastoid muscles was performed in 19 patients with Ménière's disease, 12 patients with an acute peripheral vestibular lesion, and 19 control subjects matched for sex and age. During maximum voluntary clenching, patients with peripheral vestibular lesions had the highest co-contraction of the sternocleidomastoid muscle (analysis of covariance, p=0.02), the control subjects had the smallest values, and the patients with Ménière's disease had intermediate values. The control subjects had larger standardized muscle activities than the other patient groups (p=0.001). In conclusion, during maximum voluntary tooth clenching, patients with vestibular alterations have both more active neck muscles, and less active masticatory muscles than normal controls. Results underline the importance of a more inclusive craniocervical assessment of patients with vestibular lesions.

Temporomandibular disorder and generalized joint hypermobility: electromyographic analysis of the masticatory muscles

Pasinato, Fernanda; Souza, Juliana Alves; Corrêa, Eliane Castilhos Rodrigues; Silva, Ana Maria Toniolo da
Fonte: UNICAMP/FOP Publicador: UNICAMP/FOP
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; Formato: application/pdf
Publicado em 10/11/2015 POR
Relevância na Pesquisa
66.8%
Aim: This study aimed to verify the presence of generalized joint hypermobility (GHJ) in individuals with temporomandibular disorders (TMD) and asymptomatic individuals and to compare the activity of their masticatory muscles. Methods: 61 female patients aged 18 to 35 years were evaluated: 34 with diagnosis of TMD by the Research Diagnostic Criteria for Temporomandibular Disorders constituted the TMD group and 27 constituted the asymptomatic group. The subgroups were classified according to the presence of GJH by the Beighton score. Electromyographic recordings of the masseter and anterior temporal muscles were acquired bilaterally at mandibular rest and in maximal intercuspal position. Results: GJH was present in 64.71% of the individuals with TMD and in 40.74% of the asymptomatic individuals. The electrical activity was significantly higher in the right masseter (p = 0.0111), left masseter (p = 0.0007) and right temporal (p = 0.0046) in the patients with TMD than in the asymptomatic individuals. The activity of the left masseter muscle was significantly higher (p=0.0072) in the volunteers with TMD and GJH compared with in the individuals with TMD but without hypermobility. Also, the right temporal muscle showed higher activity in subjects with GJH and TMD compared with asymptomatic individuals without hypermobility (p=0.0248). Conclusions: The electrical activity was higher at mandibular rest in TMD and TMD/ GJH patients. This result suggests that these muscles need to be recruited for the joint stabilization due to the low ligamentar resistance and a possible proprioceptive deficit. This recruitment appears to occur asymmetric and variedly among all muscles involved in this stabilization...

; Effect of tens on the activation pattern of the masticatory muscles in TMD patients

Rodrigues, Delaine; Oliveira, Anamaria Siriani; Bérzin, Fausto
Fonte: UNICAMP/FOP Publicador: UNICAMP/FOP
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ;
Publicado em 16/11/2015 ENG
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; Temporomandibular disorder (TMD) is characterized by several signs and symptoms, such as pain and changes in the activation pattern of the masticatory muscles. Thus, the objective of this study was to evaluate the effect of transcutaneous electrical nerve stimulation (TENS) of the electromyographic pattern of the masticatory muscles in individuals with myogenic TMD. This study evaluated 40 female volunteers: 20 with myogenic TMD (x=23.04 ± 3.5) and 20 normal individuals (x=23.3 ± 3). TENS (conventional mode, 150Hz) was applied once to each group for 45 minutes. The electromyographic (EMG) signal (gain of 100 times and 1KHz sampling frequency) and visual analogue scale (VAS) were applied before and immediately after TENS application. The VAS data were analyzed using paired t-test. The EMG signals were analyzed using the normalized linear envelopes. The results showed that individuals with TMD have an alteration in the activation pattern of the masticatory muscles, when compared to the control group, and the TENS reversed this pattern. TENS reduced the pain intensity in the TDM group. We conclude that a single TENS application is effective in pain reduction and promotes betterments in the activation pattern of the masticatory muscles in individuals with TMD.