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An analysis of controlled mandibular movement.

C J Griffin, R Malor

    Monographs in Oral Science
    |January 1, 1975
    PubMed
    Summary

    Kinematographic analysis reveals distinct jaw movement patterns in temporomandibular joint (TMJ) syndrome patients compared to healthy individuals. TMJ patients exhibit incoordinated jaw movements and mandibular displacement, unlike normal integrated jaw function.

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    Area of Science:

    • Dentistry
    • Biomechanics
    • Physiology

    Background:

    • Jaw movement analysis using kinematographic traces provides insights into the relationship between centric relation and centric occlusion.
    • Understanding these relationships is crucial for diagnosing and managing temporomandibular joint (TMJ) disorders.

    Purpose of the Study:

    • To compare jaw movement kinematics between patients with TMJ syndrome and healthy subjects.
    • To identify characteristic differences in jaw movement patterns, centric relation, and centric occlusion in TMJ patients.

    Main Methods:

    • Utilized kinematographic traces to record and analyze jaw movements in sagittal and coronal planes.
    • Assessed the positional relationship between centric relation and centric occlusion.
    • Measured angles of opening, terminal opening, and closing, and evaluated jaw-opening reflexes.

    Main Results:

    • Normal subjects demonstrated integrated jaw movements with centric relation postero-inferior or coincident with centric occlusion.
    • TMJ patients displayed incoordinated jaw movements, with centric relation lateral and antero-inferior to centric occlusion.
    • TMJ patients exhibited longer rhythmic traces, centric slides, asynergistic movements, and often unelicitable jaw-opening reflexes, indicating mandibular displacement.

    Conclusions:

    • Jaw movement analysis via kinematography effectively differentiates TMJ syndrome from normal jaw function.
    • TMJ syndrome is characterized by mandibular displacement, with centric occlusion often being a strained position lateral and postero-superior to centric relation.
    • These findings highlight the diagnostic value of kinematic analysis in TMJ disorders.

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