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Lateral preference in mastication: relation to pain.

L V Christensen, J T Radue

    Journal of Oral Rehabilitation
    |November 1, 1985
    PubMed
    Summary
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    Masseter muscles show similar force generation during chewing and maximum voluntary clenching. However, motor unit activity patterns may differ, potentially explaining varied pain onset during clenching exercises.

    Area of Science:

    • Biomedical Engineering
    • Physiology
    • Neuromuscular Studies

    Background:

    • The masseter muscles are crucial for mastication and jaw clenching.
    • Understanding their functional differences and fatigue patterns is important for diagnosing and treating jaw disorders.

    Purpose of the Study:

    • To compare the contractile activity and motor unit recruitment of the right and left masseter muscles during chewing and maximum voluntary clenching (MVC).
    • To investigate the relationship between chewing side preference, muscle pain onset, and MVC activity.

    Main Methods:

    • Ten subjects performed unilateral gum chewing and MVC until pain onset.
    • Surface electromyography (EMG) assessed masseter muscle activity.
    • Bite force and pain thresholds were recorded.

    Related Experiment Videos

    Main Results:

    • Both masseter muscles generated similar forces during chewing and MVC.
    • EMG indicated comparable motor unit recruitment for chewing and non-chewing sides.
    • Differences in motor unit firing or dropout patterns were observed during MVC.
    • A trend suggested a low pain threshold correlated with high chewing side activity.

    Conclusions:

    • Masseter muscles exhibit symmetrical force production but potentially asymmetrical motor unit behavior during MVC.
    • Easily fatigued motor units generating high tension may contribute to early muscle pain.
    • No clear link was found between chewing preference, pain onset, and MVC side.