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Related Experiment Videos

Experimental teeth clenching in man.

L V Christensen1

  • 1Department of Stomatognathic Physiology, Faculty of Odontology, Gothenburg University, Sweden.

Swedish Dental Journal. Supplement
|January 1, 1989
PubMed
Summary
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This study developed an electromyographic method for measuring maximum voluntary teeth clenching (MVC). Cooling the jaw muscles prevented pain during MVC, unlike ibuprofen, suggesting physical interventions are effective for jaw muscle discomfort.

Area of Science:

  • Biomedical Engineering
  • Neuromuscular Physiology

Background:

  • Jaw muscle fatigue and pain are common issues.
  • Quantifying maximum voluntary clenching (MVC) is crucial for understanding these issues.

Purpose of the Study:

  • To develop an electromyographic (EMG) method for quantifying MVC.
  • To investigate jaw muscle fatigue and pain during MVC.
  • To explore prevention strategies for MVC-induced discomfort.

Main Methods:

  • Quantified MVC using continuous functions of motor unit activity in the masseter muscle.
  • Assessed fatigue and pain onset and endurance during sustained MVC.
  • Evaluated the effects of ibuprofen and cold therapy on MVC-induced pain and muscle activity.

Main Results:

Related Experiment Videos

  • Masseter muscle fatigue occurred after ~30 seconds of MVC, linked to motor unit recruitment.
  • Pain emerged around 60 seconds, with exhaustion by 120 seconds.
  • Ibuprofen did not alter pain; 30 minutes of cooling prevented pain and increased EMG activity.

Conclusions:

  • Jaw muscle fatigue and pain during MVC are modulated by motor unit activity.
  • Cold therapy effectively prevents pain during MVC, potentially by altering myoelectrical signals.
  • Physical interventions show promise for managing jaw muscle discomfort during clenching activities.