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[Mandibular position sense during open-close movement].

H Kanehira, T Maeda, H Inoue

    Nihon Hotetsu Shika Gakkai Zasshi
    |December 1, 1989
    PubMed
    Summary
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    Mandibular position sense is influenced by jaw opening direction and vertical position. Accuracy is greatest near tooth contact, with distinct perception shifts during opening versus closing movements.

    Area of Science:

    • Dentistry
    • Neuroscience
    • Biomechanics

    Context:

    • Understanding proprioception in the human jaw is crucial for diagnosing and treating various oral and maxillofacial conditions.
    • Jaw position sense, or proprioception, plays a vital role in the precise control of masticatory movements.
    • Previous research has explored jaw proprioception, but the specific influence of movement direction and reference position requires further investigation.

    Purpose:

    • To investigate the accuracy of mandibular position sense at different jaw openings (5, 10, 15, 20 mm) during both opening and closing movements.
    • To analyze how the direction of jaw movement (opening vs. closing approach) affects the perception of memorized mandibular positions.
    • To determine if the variability in perceived position changes based on the reference opening and movement direction.

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    Summary:

    • Eight subjects memorized specific vertical jaw positions and performed repeated open-close movements.
    • Perceived mandibular positions were consistently lower than reference positions during closing approaches and higher during opening approaches.
    • Accuracy, measured by data variance, was highest at 5 mm opening and lowest at 10 mm opening with an opening approach.

    Impact:

    • Findings suggest that mandibular position sense is sensitive to both the spatial vertical position of the jaw and the direction of movement.
    • The neuronal control mechanisms for mandibular position appear to be more refined near the intercuspal (tooth contact) position.
    • This research provides insights into the neural basis of jaw control, potentially informing treatments for proprioceptive deficits.