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Related Experiment Videos

Visualization and quantitative analysis using normalized electromyographic linear envelopes of muscle contraction

K Kashiwagi1, M Tanaka, K Kimura

  • 1Department of Fixed Prosthodontics, Osaka Dental University, Japan.

Journal of Osaka Dental University
|April 1, 1995
PubMed
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This study introduces normalized electromyography (EMG) profiles for analyzing masticatory muscle activity during chewing. These profiles enhance reproducibility for clinical dentistry applications.

Area of Science:

  • Biomedical Engineering
  • Clinical Dentistry
  • Biomechanics

Background:

  • Surface electromyography (EMG) is valuable in dentistry but raw data interpretation is challenging due to low reproducibility.
  • Normalized EMG envelopes, or EMG profiles, offer a method to analyze time-course data, improving comparability across individuals and sessions.
  • Previous research has focused on gait analysis, with limited application to masticatory muscle studies.

Purpose of the Study:

  • To develop and evaluate normalized electromyography (EMG) profiles for unilateral masticatory muscle activity during gum chewing.
  • To assess the reproducibility and comparability of EMG data from the anterior temporalis, masseter, and anterior digastric muscles.
  • To investigate the phasic characteristics of EMG profiles in asymptomatic volunteers.

Main Methods:

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  • Five asymptomatic volunteers underwent unilateral gum chewing while EMG signals from anterior temporalis (Ta), masseter (M), and anterior digastric (Da) muscles were recorded.
  • Mandibular kinesiography tracked incisal point movement simultaneously with EMG data collection for 90 seconds.
  • Ensemble averages of EMG profiles were computed from 10 stable chewing strokes, and correlation analyses were performed.

Main Results:

  • EMG profiles for the anterior temporalis (Ta) and masseter (M) muscles demonstrated high similarity during chewing.
  • The EMG profiles for the anterior digastric (Da) muscle exhibited distinct patterns compared to the elevator muscles (Ta and M).
  • Intraclass correlation coefficients indicated good reproducibility for the developed EMG profiles.

Conclusions:

  • Normalized EMG profiles provide a reproducible method for analyzing masticatory muscle activity in clinical dentistry.
  • The distinct EMG profile of the digastric muscle suggests different functional roles compared to the temporalis and masseter during chewing.
  • This methodology holds potential for objective assessment and comparison of masticatory muscle function.