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Analysis of human mandibular movement.

J M Goodson, E Johansen

    Monographs in Oral Science
    |January 1, 1975
    PubMed
    Summary

    This study used a six-transducer mandibulograph to analyze jaw movements, revealing detailed 3D pathways and velocity profiles. Findings offer new insights into the mechanics of chewing, opening, closing, and lateral/protrusive jaw motions.

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    Area of Science:

    • Biomechanics
    • Dental Mechanics
    • Kinesiology

    Background:

    • Understanding complex mandibular movements is crucial for diagnosing and treating various dental and temporomandibular joint disorders.
    • Previous methods for analyzing jaw motion lacked the precision to capture detailed 3D pathways and velocity profiles.

    Purpose of the Study:

    • To analyze three-dimensional pathways, displacement, and velocity profiles of mandibular areas during five distinct jaw movements.
    • To demonstrate the analytical and diagnostic value of a novel computer-implemented method for studying jaw kinematics.

    Main Methods:

    • Utilized a six-transducer mandibulograph to capture parametric electrical outputs.
    • Employed digital computer implementation of derived mathematical equations of motion.
    • Analyzed five jaw movements: chewing, open-close, right lateral, left lateral, and protrusive.

    Main Results:

    • Chewing movements showed a coordinated sequence with prominent lateral motion and a distinct vertical descent.
    • Open-close movements exhibited minor hesitancy, with initial condyle and occlusal area movements creating rotation about a moving axis.
    • Jaw movement pathways were detailed in sagittal and frontal planes, with closing occurring from a protruded condyle position.

    Conclusions:

    • The described method provides valuable analytical and diagnostic insights into mandibular kinematics.
    • New clarifications and understanding of the nature of various jaw movements were achieved.
    • The study highlights the complexity and coordination involved in normal jaw function.

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