Skeletal Sagittal and Vertical Facial Types and Electromyographic Activity of the Masticatory Muscle

Kuen, Bong; Kim, Chun-Hi; Baek, Seung‐Hak

doi:10.2319/0003-3219(2007)077[0463:ssavft]2.0.co;2

Cited by 56 publications

(69 citation statements)

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“…Some articles reported that the longer the face of an individual, the greater the EMG activity of the temporal muscle. 3,8 Still others report that this muscle activity does not present any correlation with vertical face morphology. 4 On the other hand, there are studies that do not show differences in the EMG activity of the masseter muscle when com- 8 According to Farella et al 7 and Cha et al, 8 the habitual activity of the masseter muscle does not seem to be influenced by the vertical craniofacial morphology.…”

Section: Introductionmentioning

confidence: 99%

“…Their function and anatomy have been evaluated by electromyographic (EMG) exams, [1][2][3][4][5][6][7][8][9] bite force, 10 computed tomography of muscle thickness, 11 ultrasonography 5,[12][13][14][15] and magnetic resonance, 16 in addition to immunohistochemistry evaluations of muscular fibers. 17 EMG evaluations of masticatory muscles have produced divergent results when individuals with different vertical facial growth are compared.…”

Section: Introductionmentioning

confidence: 99%

“…Although the normalization of EMG signals for comparisons between individuals is a recommendation of the International Society of Electrophysiology and Kinesiology, the majority of similar studies 1,8,9 used the raw data for such comparisons. This study normalized the values of rest and bilateral mastication, placing them in accordance with a reference value for the individual (isometric contraction).…”

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confidence: 99%

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Electromyographic Activity of Masseter and Temporal Muscles with Different Facial Types

Vianna-Lara

Cária

Tosello

et al. 2009

The Angle Orthodontist

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Objectives:To compare the electromyographic (EMG) activity of the masseter and anterior portion of temporal muscles in different vertical facial types. Materials and Methods: Clinical examination, cephalometric analysis, and electromyographic examination were performed in 44 volunteers ranging from 18 to 35 years old. The volunteers were classified on the basis of their vertical facial characteristics into three groups-brachyfacial, mesofacial, and dolicofacial-by the grouping analysis. The EMG records were obtained with three repetitions during mandibular rest, maximum voluntary contraction in intercuspidation, and simultaneous bilateral isotonic contraction. The Kolmogorov-Smirnov and Levene tests were applied to verify the normality and homogeneity of variance. Analysis of variance and the Kruskal-Wallis test identified statistical differences among groups that did not present normality and homogeneity of distribution, respectively. Significance for all statistical tests was set at P Ͻ .05. Results: At rest, only the right temporal and masseter muscles presented statistically significant differences among the groups. The differences were observed between groups 1 and 2 (P ϭ .02) and 1 and 3 (P ϭ .038) for the right temporal muscle, and between groups 1 and 2 (P ϭ .029) for the right masseter muscle. Generally, group 1 presented the lowest EMG values for the four muscles evaluated during rest. For isotonic evaluation, none of the groups of muscles presented statistically significant differences. Conclusion: Different vertical facial types do not determine distinct patterns of EMG activity for the masseter and anterior portion of temporal muscles during rest and bilateral mastication. (Angle Orthod. 2009;79:515-520.)

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Electromyographic Activity of Masseter and Temporal Muscles with Different Facial Types

Vianna-Lara

Cária

Tosello

et al. 2009

The Angle Orthodontist

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“…In the present study, EMG was chosen for the analyses of correlation between the ME test with beads and the reliability of the methods because it is a widely used and accepted method for the investigation of masticatory muscle function (8)(9), permitting the characterization of functional problems, guiding prevention and rehabilitation actions in the speech therapy (22) and dentistry (10,11,13) area, as well as favoring the analysis of the results of treatment (12,14).…”

Section: Resultsmentioning

confidence: 99%

“…EMG has been extensively used in research, is considered to be a valid method for the assessment of masticatory muscle function (8)(9)(10)(11)(12)(13)(14) and has been correlated with masticatory efficiency (15-17).…”

Section: Introductionmentioning

confidence: 99%

Confiabilidade da eficiência mastigatória com beads e correlação com a atividade muscular

Felício

Couto²,

Ferreira

et al. 2008

Pró-Fono R. Atual. Cient.

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Background: the use of the colorimetric method with beads to evaluate mastigatory efficiency may be promising, however no report is found about its reliability. Aim: to investigate the reliability of the beads to test masticatory efficiency and its correlation with the electromyographic activities of the anterior temporal and masseter muscles. Methods: participants of this study were nineteen young adults, nine males and ten females, aged eighteen to twenty-eight years, with full dentition, Angle class I, with no history of temporomandibular disorder, neurological or cognitive deficit, previous or current tumors or traumas in the head and neck region, and orthodontic treatment or orofacial myofunctional therapy. The masticatory efficiency test was performed using beads, fuchsine-containing granules, in the folowing conditions: habitual chewing, right and left unilateral chewing, for 20 seconds. Electromyographic recordings were obtained simultaneously. Also, the maximal clenching was registered. The amount of fuchsin released upon chewing was measured using a Beckman DU-7 UV-Visible Spectrophotometer (Beckman Inc., Palo Alto, CA, USA). Results: high reliability was observed for the masticatory efficiency test (r = 0.86, p < 0.01) and correlation with the electromyographic activities (r = 0.76, p < 0.01). Also, positive and significant correlations were observed when the conditions were separately analyzed. Conclusion: the masticatory efficiency test performed with beads proved to be a reliable method and positively correlated to the electromyographic activities of the anterior temporal and masseter muscles. Key Words: Mastication; Efficiency; Electromyography; Masticatory Muscles. ResumoTema: a avaliação da eficiência mastigatória pela análise colorimétrica com beads, pode ser um método promissor, mas não há relatos sobre a sua confiabilidade. Objetivo: investigar a confiabiabilidade das beads para teste de eficiência mastigatória e a correlação com a atividade eletromiográfica dos músculos masseter e temporal anterior. Método: participaram dezenove sujeitos adultos jovens, nove do gênero masculino e dez do feminino com idades entre dezoito e vinte-oito anos, com dentição completa, sem histórico de desordem temporomandibular, trauma, cirurgia na região de cabeça e pescoço, tratamento ortodôntico ou fonoaudiológico. O teste de eficiência mastigatória foi realizado com beads nas condições: mastigação habitual, mastigação unilateral direita e esquerda, com duração de 20 segundos. Simultaneamente, foi realizada a eletromiografia. A atividade em máxima intercuspidação habitual dos dentes também foi registrada. A quantidade de fucsina liberada após a mastigação foi medida usando o espectrofotômetro Beckman DU-7 UV-Visible (Beckman Inc., Palo Alto, CA, USA). Resultados: houve alta confiabilidade do teste de eficiência mastigatória (r = 0,86, p < 0,01) e correlação significante com a atividade eletromiográfica (r = 0,76, p < 0,01). Também houve correlações positivas quando as provas foram analisadas separadament...

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Correlation of masticatory muscle activity and occlusal function with craniofacial morphology: a prospective cohort study

et al. 2023

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Objectives: Masticatory function, including masticatory muscle activity and occlusal function, can be affected by craniofacial morphology. This study aimed to investigate the relationship between craniofacial morphology and masticatory function in participants who had completed orthodontic treatment at least two years before and had stable occlusion.Materials and Methods: Fourty-two healthy participants were prospectively enrolled and divided into three vertical cephalometric groups according to the mandibular plane angle. Masticatory muscle activity (MMA) in the masseter and anterior temporalis muscles was assessed using surface electromyography.The occlusal contact area and occlusal force (OF) were evaluated using the Dental Prescale System.Masticatory muscle e ciency was calculated by dividing MMA by OF. The craniofacial morphology was analyzed using a lateral cephalogram. The masticatory function was compared using one-way analysis of variance. Pearson correlations were used to assess the relationships between craniofacial morphology and masticatory function.Results: The hypodivergent group had the lowest MMA and the highest e ciencies in the masseter and anterior temporalis muscle (p < 0.05). MMA showed a positive relationship with mandibular plane angle, whereas the occlusal function demonstrated a negative relationship (p < 0.05). The anterior temporalis muscle activity negatively correlated with ramus height (p < 0.05).Conclusions: Vertical craniofacial morphology was related to masticatory function in participants with normal occlusion after orthodontic treatment. Participants with hypodivergent facial pro les may have low MMA and high occlusal function, resulting in good masticatory muscle e ciency.Clinical relevance: Vertical craniofacial morphology is an important factor to consider in orthodontic diagnosis and prosthetic treatment planning.

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Skeletal Sagittal and Vertical Facial Types and Electromyographic Activity of the Masticatory Muscle

Abstract: The results suggest that the more Class III and the more hyperdivergent type, the higher resting TMA and the lesser increase of clenching MMA than expressed by other groups. Significant differences existed in TMA and MMA according to sagittal and vertical facial skeletal types.

Cited by 56 publications

References 28 publications

Electromyographic Activity of Masseter and Temporal Muscles with Different Facial Types

Electromyographic Activity of Masseter and Temporal Muscles with Different Facial Types

Confiabilidade da eficiência mastigatória com beads e correlação com a atividade muscular

Correlation of masticatory muscle activity and occlusal function with craniofacial morphology: a prospective cohort study

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