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Related Experiment Videos

A comparison of centric relation with maximum intercuspation based on quantitative electromyography

J D Buxbaum, F J Parente, W O Ramsey

    Journal of Oral Rehabilitation
    |January 1, 1982
    PubMed
    Summary

    This study found increased muscle activity when the mandible shifts to centric relation. These findings suggest limitations in using centric relation as a primary reference in dental therapy.

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    Area of Science:

    • Dental Science
    • Biomechanics
    • Neuromuscular Dentistry

    Background:

    • The relationship between jaw position and muscle activity is crucial in dentistry.
    • Maximum intercuspation and centric relation are key maxillo-mandibular positions.
    • Understanding muscle activity variations is essential for effective clinical therapy.

    Purpose of the Study:

    • To investigate alterations in muscle activity during the shift from maximum intercuspation to centric relation.
    • To quantify muscle activity changes in masseter and temporal muscles.
    • To assess the clinical implications of using centric relation as a reference position.

    Main Methods:

    • Electromyography (EMG) using an integrator-averager to measure micro V average amplitude.
    • Assessment of masseter and temporal muscles in two jaw positions: centric relation and maximum intercuspation.

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  • Data collection across three functional modes: first contact occlusion, chewing, and swallowing.

    • Main Results:

    • A statistically significant increase in micro V (muscle activity) was observed in all centric relation positions.
    • Analysis of variance yielded an F value of 5.88258 (p=0.005).
    • Quantification of horizontal deviation from maximum intercuspation to centric relation was performed.

    Conclusions:

    • Centric relation positions demonstrate significantly altered muscle activity compared to maximum intercuspation.
    • The findings indicate potential limitations in relying solely on centric relation for clinical dental therapy.
    • Further research may be needed to refine the use of jaw relation positions in treatment planning.