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Mandibular asymmetry and its relation to pain dysfunction.

E H Williamson, M D Simmons

    American Journal of Orthodontics
    |December 1, 1979
    PubMed
    Summary
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    This study found no link between mandibular asymmetry and jaw muscle pain in patients with malocclusions. Mandibular asymmetry was common, impacting treatment planning for dental professionals.

    Area of Science:

    • Dentistry
    • Orthodontics
    • Craniofacial Anatomy

    Background:

    • Mandibular asymmetry is a common condition affecting facial structure.
    • Malocclusions often coexist with asymmetry, complicating orthodontic treatment.
    • The relationship between mandibular asymmetry and masticatory muscle pain requires further investigation.

    Purpose of the Study:

    • To investigate the correlation between mandibular asymmetry and masticatory muscle sensitivity.
    • To determine if facial pain from muscle palpation is associated with the degree of mandibular asymmetry.

    Main Methods:

    • Fifty-three subjects with malocclusions were assessed for mandibular asymmetry using submental-vertex and frontal cephalograms.
    • Masticatory muscles were palpated to assess sensitivity and tenderness.

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  • Pretreatment muscle pain levels were correlated with measured degrees of mandibular asymmetry.

    • Main Results:

    • No statistically significant correlation was found between the degree of mandibular morphologic asymmetry and facial pain elicited from muscle palpation.
    • Mandibular asymmetry was observed in the majority of subjects, suggesting it is a prevalent condition.
    • Potential treatment complexities were noted for Class II molar and canine relationships, particularly on the right side.

    Conclusions:

    • Mandibular asymmetry does not appear to be directly correlated with masticatory muscle pain.
    • Clinicians must consider asymmetry in all three planes of space for effective occlusal treatment planning.
    • Awareness of asymmetry is crucial for anticipating and managing potential treatment compromises.