Effect of unilateral posterior crossbite on the electromyographic activity of human masticatory muscles

Alarcón, José Antonio; Martín, Conchita; Palma, Juan Carlos

doi:10.1067/mod.2000.103252

Cited by 91 publications

(101 citation statements)

References 21 publications

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“…The research quality and methodological soundness were high in one study, 15 medium in six, 16,18,[22][23][24][25] and low in one 14 (Tables 2 and 3). The most serious shortcomings were the CT design with small sample size and inadequate description of selection.…”

Section: Quality Of the Studiesmentioning

confidence: 99%

Posterior Crossbite and Functional Changes

Andrade

Gameiro

Derossi

et al. 2009

The Angle Orthodontist

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Objective: To assess, by systematically reviewing the literature, the functional changes of the masticatory muscles associated with posterior crossbite in the primary and mixed dentition. Materials and Methods: A literature survey from the Medline database covering the period from January 1965 to February 2008 was performed. Randomized controlled trials, controlled clinical trials, and clinical trials that evaluated bite force, surface electromyography, and signs and symptoms of temporomandibular disorders (TMD) were included. Two reviewers extracted the data independently and assessed the quality of the studies. Results:The search strategy resulted in 494 articles, of which 8 met the inclusion criteria. Children with posterior crossbite can have reduced bite force and asymmetrical muscle function during chewing or clenching, in which the anterior temporalis is more active and the masseter less active on the crossbite side than the noncrossbite side. Moreover, there is a significant association between posterior crossbite and TMD symptomatology. Conclusion:The consequences of the functional changes for the growth and development of the stomatognathic system deserves further investigation. (Angle Orthod. 2008;79:380-386.)

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Section: Quality Of the Studiesmentioning

confidence: 99%

Posterior Crossbite and Functional Changes

Andrade

Gameiro

Derossi

et al. 2009

The Angle Orthodontist

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“…ness of the masseter muscle 5 and increased maximal bite force values. 6 A different level of bilateral activity of the masticatory muscles was recorded in children with unilateral crossbite or lateral forced bite, [7][8][9][10][11] possibly a functional adaptation of the masticatory system to avoid cuspal interferences. Thus, it could be expected that this prolonged bilateral difference in the activity level of the masticatory muscles may work as an asymmetric training stimulation, resulting in differences in the thickness of these muscles.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonographic Thickness of the Masseter Muscle in Growing Individuals with Unilateral Crossbite

Kiliaridis

Mahboubi

Raadsheer

et al. 2007

The Angle Orthodontist

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Objective: To study the bilateral differences in the thickness of the masseter muscles in untreated individuals with lateral crossbite, as well as in subjects with successfully treated functional lateral crossbite, at least three years after the end of treatment. Materials and Methods: Three groups of growing individuals were studied: (1) untreated group: 38 individuals with unilateral crossbite, (2) control group: 224 subjects without transversal malocclusions, and (3) treated group: 18 individuals with functional lateral crossbite, treated with a quad helix, and at least three years out of retention with all permanent teeth erupted. The thickness of the masseter muscle was measured bilaterally with ultrasonography, using a real time scanner with a 7.5 MHz linear array transducer. Results: In the untreated group, the thickness of the masseter muscle on the crossbite side was statistically significantly thinner than the one on the normal side (P ϭ .025). No statistically significant differences were found in the thickness of the masseter muscle between the left and the right side in the control group. In the treated group, no statistically significant differences were found in the thickness of the masseter muscle between the former crossbite side and the normal one. Conclusion:The masseter muscle in untreated individuals with unilateral crossbite is thinner in the crossbite side when compared to the non-crossbite side possibly due to asymmetric activity of the masticatory muscles. Such an asymmetry in thickness of the masseter muscle could not be detected some years after the successful correction of the crossbite.

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“…Estudos eletromiográficos em crianças com MCPUD puderam evidenciar hiperatividade na porção anterior no músculo temporal do lado oposto ao cruzamento dentário Acta Scientiarum. Health Sciences Maringá, v. 32, n. 2, p. 199-204, 2010 (ALARCÓN et al, 2000;GOMES et al, 1998;INGERVAL;THILANDER, 1975). Em voluntários com idade 7 a 9 anos foi observada hiperatividade no músculo masseter no lado do cruzamento dentário (GOMES et al, 1998) e, acima de 10 anos, uma simetria no padrão de contração no músculo masseter de ambos os lados (ALARCÓN et al, 2000;INGERVAL;THILANDER, 1975).…”

Section: Introductionunclassified

“…Health Sciences Maringá, v. 32, n. 2, p. 199-204, 2010 (ALARCÓN et al, 2000;GOMES et al, 1998;INGERVAL;THILANDER, 1975). Em voluntários com idade 7 a 9 anos foi observada hiperatividade no músculo masseter no lado do cruzamento dentário (GOMES et al, 1998) e, acima de 10 anos, uma simetria no padrão de contração no músculo masseter de ambos os lados (ALARCÓN et al, 2000;INGERVAL;THILANDER, 1975). De acordo com Hori et al (1995), os músculos temporais, quando comparados com os músculos masseteres, são considerados os músculos que mais incidem as Disfunções Têmporo Mandibulares (DTMs) e que, geralmente, envolvem problemas de posicionamento mandibular.…”

Section: Introductionunclassified

Eletromiografia dos músculos temporal e masseter em crianças com mordida cruzada posterior direita

Pissulin

Bérzin

Júnior

et al. 2010

Acta Sci. Health Sci.

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RESUMO. Sabe-se que a mastigação unilateral e a hiperatividade muscular podem estar presentes nos indivíduos com mordida cruzada posterior unilateral. O objetivo do presente estudo foi avaliar as alterações eletromiográficas dos músculos mastigatórios em portadores de mordida cruzada posterior unilateral direita (MCPUD). Eletrodos bipolares passivo de superfície foram colocados bilateralmente sobre os músculos temporal (porção anterior) e masseter, de 20 crianças selecionadas, do sexo feminino com idade de 7 a 8 anos (X = 7.4 e DP 0.5). Os registros foram coletados durante as contrações isotônicas habitual, direita, esquerda e bilateral simultânea, além das contrações isométricas voluntárias máximas direita e esquerda, cujos sinais foram utilizados para a normalização da amplitude da atividade elétrica. Todas as contrações isométricas foram feitas com tubo de látex. Durante as mastigações habitual e direita, observou-se uma hiperatividade do músculo temporal anterior esquerdo, e hipoatividade do músculo masseter esquerdo. Concluiu-se que o padrão eletromiográfico dos indivíduos com MCPUD sugere um padrão mastigatório unilateral, sendo os músculos masseter direito e porção anterior do músculo temporal esquerdo mais ativos que os outros músculos avaliados.Palavras-chave: eletromiografia, maloclusão, mastigação.ABSTRACT. Electromyography of the temporalis and masseter muscles in children with right unilateral crossbite. This study proposal was to evaluate the changes at a masticatory muscle temporalis and masseter, through a eletromyographic, at ponters of the right unilateral bite posterior, verifying the difference at the eletric activity between right and left sides. Twenty female volunteers, with ages between 7 and 8 (x = 7.4). The eletromyographics signals were collected in both sides in all volunteers in rest situations and in an usual isotonic mastication, right, left and bilateral and the maximun isometric constriction, which sinal was used to the eletric activity amplitude normalization. The results signed that the right masseter muscle presents an expressive statistic difference, if compared with the left masseter muscle during the left and right mastication, suggesting a right unilateral mastication. The muscle haven't gotten any expressive variance in this amplitude which remained to a proximate flat noticed in a right and habitual mastication, suggesting a right and one sided mastication during the left mastication occurs a raise of the eletric signal amplitude of the muscle left masseter. The right masseter muscle haven't gained any expressive variance, which remained in a proximate flat observed in an usual and right mastication, suggesting a muscular pattern hyperfunction next to the dental crossing.

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Effect of unilateral posterior crossbite on the electromyographic activity of human masticatory muscles

Cited by 91 publications

References 21 publications

Posterior Crossbite and Functional Changes

Posterior Crossbite and Functional Changes

Ultrasonographic Thickness of the Masseter Muscle in Growing Individuals with Unilateral Crossbite

Eletromiografia dos músculos temporal e masseter em crianças com mordida cruzada posterior direita

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