Pilot study of the heterogeneous patterns of masticatory muscle coordination in nonpatient population

Mushimoto, Kozo; Mushimoto, Eiko; Kakutani, Hidekazu; Nishimura, Ichiro

doi:10.1016/s0022-3913(05)80317-8

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…Previous studies have found that denture wearing improves jaw muscle activities during chewing [11,25], with prominent activation obtained in chewing side masseter muscle activity [24,[36][37][38]. This decrease in gain induced by use of a denture also suggests improved quantitative coordination of jaw muscle activities, because increased activity for the chewing side masseter muscle while chewing may be particularly enhanced by occlusal reconstruction while wearing a denture [27,[39][40][41][42].…”

Section: Discussionmentioning

confidence: 99%

Effects of denture wearing on coordinated features of jaw and neck muscle activities during chewing in partially edentulous elderly patients

et al. 2021

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This study was performed to examine how denture wearing improves jaw and neck muscle coordination during chewing in partially edentulous elderly patients. Methods: Sixteen patients classified as Eichner's index B2 or B3 and 16 young dentate subjects were enrolled. Jaw and neck muscle activities during chewing were recorded using electromyography with and without denture wearing, then analyzed using intermuscular Electromyography (EMG)-EMG transfer and EMG-EMG coherence function analyses to clarify quantitative, temporal, and functional coordination of jaw and neck muscle activities while chewing. Occlusal force and masticatory scores were also determined. Results: Denture wearing increased the power values for jaw closing muscle activities, and improved occlusal area and force, and masticatory score. Gain values for jaw closing and opening muscle activities were decreased in those wearing dentures compared to those not wearing dentures. Denture wearing resulted in equivalent gain values for jaw closing and opening muscle activities as compared to the young subjects. Coherence values for chewing and non-chewing side neck muscle activities were increased as compared to not denture wearing. Conclusions: The suitability of denture wearing can be evaluated from the viewpoint of gain as a quantitative parameter showing coordination between jaw closing and opening muscle activities. Such evaluation can be performed from the viewpoint of coherence as a parameter of functional coordination between jaw and neck muscle activities during chewing in partially edentulous elderly patients. The gain parameter in regard to jaw muscle activities may be compensated to a state equivalent to that seen in young subjects by wearing an appropriate denture.

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Section: Discussionmentioning

confidence: 99%

Effects of denture wearing on coordinated features of jaw and neck muscle activities during chewing in partially edentulous elderly patients

et al. 2021

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“…Besides, Visser, et al 29 found functional differences in the muscular activity of individuals with TMD. On the other hand, the electrical activity of the masticatory muscles in a normal population is also heterogeneous, and there are conditions in which the chewing coordination of such individuals becomes abnormal 18 . The behavior of the masticatory muscles in individuals with TMD can be evaluated considering the working and non-working sides, by calculation of the asymmetry index.…”

Section: Discussionmentioning

confidence: 99%

Masticatory function in temporomandibular dysfunction patients: electromyographic evaluation

et al. 2005

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emporomandibular dysfunction (TMD) is a complex disturbance that involves the masticatory muscles and/or temporomandibular joint, causing damage to the masticatory function. This study evaluated the electromyographic activity of the masseter muscle during habitual mastication of bread, apple, banana, cashew nut and paraffin film (Parafilm M) in 25 adult subjects, of both gender, with TMD. The results were compared to those of a control group, composed of 15 adult subjects, of both sexes, free of signs and/or symptoms of TMD. The MYO-TRONICS Inc., K6-I computer software was used for electromyographic processing and analyzed the following parameters: duration of the act, duration of the masticatory cycle and number of cycles. No significant differences were found between subjects in the control group and individuals with TMD as to duration of the masticatory act and of the masticatory cycle, considering all materials used for mastication. The duration of the masticatory act and cycle was longer during mastication of paraffin film in both groups. The number of masticatory cycles was higher for mastication of apple in comparison to mastication of banana, in both groups. It can be concluded that the consistency of foods influences the duration parameters of the act, duration of the cycle and the number of masticatory cycles, and the behavior of the masticatory muscles in individuals with TMD during habitual mastication is similar to that verified in individuals without TMD. Uniterms: Mastication; Electromyography; Food; Temporomandibular joint disorders. disfunção temporomandibular (DTM) representa um quadro complexo que envolve os músculos mastigatórios e/ou a articulação temporomandibular, causando prejuízos à função mastigatória. Este estudo avaliou a atividade eletromiográfica do músculo masseter durante a mastigação habitual de pão, maçã, banana, castanha de caju e folha de parafilme (Parafilm M) em 25 indivíduos adultos, de ambos os gêneros, com DTM. Os resultados foram comparados com os obtidos para o grupo controle, composto por 15 indivíduos adultos, de ambos os gêneros, livres de sinais e/ou sintomas de DTM. Foi utilizado o programa computadorizado MYO-TRONICS Inc., K6-I no modo de processamento eletromiográfico, tendo sido analisados os seguintes parâmetros: duração do ato, duração do ciclo mastigatório e número de ciclos mastigatórios. Não foram encontradas diferenças estatisticamente significantes entre os indivíduos do grupo controle e com DTM no que diz respeito à duração do ato e do ciclo mastigatório, bem como o número de ciclos, considerando todos os materiais utlizados para a mastigação. A duração do ato e do ciclo mastigatório foi maior durante a mastigação de parafilme em ambos os grupos. O número de ciclos mastigatórios foi maior para a mastigação de maçã, em comparação à banana, nos diferentes grupos. Pode ser concluído que a consistência dos alimentos influencia a duração dos parâmetros duração do ato, duração do ciclo e número de ciclos mastigatórios e o comportamento dos músculos mastigatóri...

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“…See the text for details. 'pattern' changes to be the result of amplitudinal and temporal parameter changes exhibited by the masticatory muscles during chewing [1][2][3][4][5][6][7][8].…”

Section: Discussionmentioning

confidence: 99%

“…Physiological, biological and clinical (dental) studies on masticatory muscle activity and jaw movement have examined the relationship between the working and balancing sides during chewing in primates, including humans [1][2][3][4][5][6][7][8]. These previous studies have revealed several differences in the amplitude and duration of masticatory muscle activity and jaw movement.…”

Section: Introductionmentioning

confidence: 99%

Synchronization of masseter activity patterns between the right and left sides during chewing in healthy young males

Miyaoka

Ashida

Iwamori

et al. 2014

Journal of Medical Engineering & Technology

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Masseter activity patterns during chewing, which were quantitatively assessed using T50 values, were compared between the right and left sides of healthy young males. Surface electromyograms were recorded from both masseters, and each participant was asked to chew four different agar samples at his own pace across two separate sessions. The four agar samples, each possessing differing textural properties, consisted of two normal and two distinctive agar varieties. The Pearson's correlation coefficient was calculated for each pair of T50 values to evaluate the degree of synchronization of activity patterns between both masseters. A three-way analysis of variance revealed significant main effects of the 'participant' and 'experimental session' factors, but not of the 'test food'. The number of significant coefficients increased stepwise by increasing the number of chews per sequence. These results suggest the importance of the initial stages of chewing sequences in facilitating the synchronization of bilateral masseter activity patterns.

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Pilot study of the heterogeneous patterns of masticatory muscle coordination in nonpatient population

Cited by 6 publications

References 27 publications

Effects of denture wearing on coordinated features of jaw and neck muscle activities during chewing in partially edentulous elderly patients

Effects of denture wearing on coordinated features of jaw and neck muscle activities during chewing in partially edentulous elderly patients

Masticatory function in temporomandibular dysfunction patients: electromyographic evaluation

Synchronization of masseter activity patterns between the right and left sides during chewing in healthy young males

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