Progressive Jaw Muscle Fatigue and Electromyogram Activity Produced by Isometric Unilateral Biting

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Abstract
The purpose of this article is to report on the duration of bite force required during unilateral biting to produce the onset of subjective pain-discomfort in 30 healthy adult female subjects. A custom-designed strain gauge scale, or bite force meter, was constructed for the measurement of bicuspid/molar bite-force. There is an apparent association between clenching and bruxing to induce pain-discomfort in the masseter muscles. The authors found that the pain-discomfort occurred on the contralateral side during unilateral biting significantly more often (P <0.01) than on the ipsilateral side.

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