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Analysis of jaw opening reflexes.

C J Griffin, R Harris

    Australian Dental Journal
    |August 1, 1975
    PubMed
    Summary

    Jaw movement analysis using electromyograms and kinematograms revealed that a centric slide in occlusion prolonged the jaw cycle duration. Jaw opening reflex latency was comparable to electromyographic latency plus inhibition.

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    Area of Science:

    • Dental Science
    • Biomechanics
    • Physiology

    Background:

    • Understanding jaw biomechanics is crucial for diagnosing temporomandibular joint (TMJ) dysfunction.
    • Electromyography (EMG) and kinematography are key tools for analyzing jaw muscle activity and movement.
    • Normal occlusion and TMJ function are essential for rhythmic jaw movements.

    Purpose of the Study:

    • To compare electromyograms and kinematograms during a rhythmic jaw cycle.
    • To investigate the impact of centric slide on jaw cycle duration and reflex latency.
    • To analyze the relationship between electromyographic and kinematographic jaw opening reflex latency.

    Main Methods:

    • Recorded electromyograms and kinematograms in 35 male dental students (average age 25) with normal occlusion and no TMJ dysfunction.
    • Subjects performed a rhythmic open-close-clench jaw cycle while occluding on molar teeth.
    • Analyzed mechanical tracings for centric slide and measured jaw cycle duration and reflex latencies.

    Main Results:

    • Seven subjects exhibited a centric slide, characterized by a significantly longer jaw cycle duration than normal.
    • The kinematographic latency of the jaw opening reflex was approximately equal to the sum of electromyographic latency and inhibition.
    • These findings suggest a correlation between occlusal variations and altered jaw movement dynamics.

    Conclusions:

    • Centric slide in occlusion can lead to prolonged jaw cycle duration.
    • Jaw opening reflex latency is influenced by both electrical muscle activity and neural inhibition.
    • Integrated EMG and kinematic analysis provides valuable insights into jaw function and potential dysfunctions.

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