EMG spectral characteristics of masticatory muscles and upper trapezius during maximum voluntary teeth clenching. | Semantic Scholar (2024)

The multiple correlations showed that the SCM and masseter need to be coordinated and contracted simultaneously to perform the biting task (van der Bilt et al., 2006) and long term dental effects and indirect effects of enhanced neck musculature should be taken into consideration for follow-up study.

The measurements of surface EMG variables and the indices obtained according to the study protocol were highly repeatable in healthy men and additional studies using templates and intraexaminer measurement errors are warranted in both men and women.

The findings from this study do not support pathophysiological muscle chain theories postulating simple biomechanical coupling of neck and jaw muscles and may instead occur as a result of complex neurophysiological interactions.

The surface EMG measurements according to the three MVC methods exhibited good to excellent reproducibility.

The assumption of a relationship between jaw clenching and the activity of the neck muscles investigated is supported, however, the low level of co-contraction activity requires further study to elucidate possible pathophysiological interactions at the level of single motor units.

The findings showed that maximum handgrip force decreased and the resistance to fatigue increased in complete edentulous individuals using appropriate prostheses, and the central roles of periodontal mechanoreceptors were revealed.

SEMG is a suitable tool for prosthodontists because it provides objective results on the stomatognathic system muscles function and can significantly increase muscle tension of the masticatory muscles and diminish muscle motor units recruitment during maximal contraction.

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A protocol for the standardisation of trapezius muscle that may be used within dental clinical applications was defined, and the repeatability of masseter, temporalis and Trapezius electromyographic recordings for serial assessments was assessed in healthy subjects.

Investigation of surface electromyographic activity of neck, trunk, and masticatory muscles in subjects with temporomandibular joint (TMJ) internal derangement treated with anterior mandibular repositioning splints found no statistically significant difference after treatment.

In conclusion, the presence of a complete or partial Angle occlusal Class I did not seem to influence the standardized contractile activities of masseter, temporalis and SCM muscles during a maximum voluntary clench.

Muscular standardised activity during device chewing was significantly higher than that during gum chewing, and it was more evenly distributed between working and balancing sides, and between masseter and temporal muscles.

The two coefficients allow an assessment of muscular asymmetry during static and dynamic clenching tests, and could be a useful tool to detect functionally altered occlusal conditions, i.e. conditions where an apparent good morphological situation is not related to a correct neuromuscular status.

Findings suggest that immediate alterations in mandibular position affect the cranio-cervical system and lower the EMG activity of masticatory and cervical muscles in the relaxed and fullbite positions.

The finding that muscles are composed of fibers at low frequency and at high frequency of discharge, which play different functional roles, suggests that the mathematical analysis of the spectrum of frequencies, could provide a functional-histological image of the muscle.

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