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Neuromuscular patterns in hemifacial microsomia.

K Vargervik, A J Miller

    American Journal of Orthodontics
    |July 1, 1984
    PubMed
    Summary

    Neuromuscular abnormalities are common in hemifacial microsomia, affecting various facial muscles. These patterns differ from normal due to underdeveloped muscles and altered jaw structure.

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    Area of Science:

    • Craniofacial biology
    • Neuromuscular function
    • Skeletal malformations

    Background:

    • Hemifacial microsomia (HFM) is a congenital condition characterized by underdevelopment of one side of the face.
    • Understanding neuromuscular involvement in HFM is crucial for effective treatment strategies.

    Purpose of the Study:

    • To investigate neuromuscular abnormalities in different types of hemifacial microsomia.
    • To correlate these neuromuscular findings with skeletal malformations in HFM patients.

    Main Methods:

    • Electromyography (EMG) was used to record neuromuscular recruitment patterns.
    • Compared 48 HFM patients with 23 normal subjects.
    • Analyzed muscles including temporalis, masseter, suprahyoid, buccinator, platysma, mentalis, and lips.

    Main Results:

    • Abnormal neuromuscular recruitment was observed in most studied muscles, excluding lips, mentalis, and buccinator.
    • Variations in recruitment patterns were noted within and between different HFM patient groups.
    • A correlation was found between gonial angle development and masseter muscle activity.
    • Temporal muscle activity was detected even without a coronoid process; muscle mass and contraction improved after coronoid process reconstruction.

    Conclusions:

    • Neuromuscular patterns in hemifacial microsomia deviate from the norm.
    • These deviations result from muscle hypoplasia and altered biomechanics of the mandible.
    • Findings highlight the interplay between skeletal and neuromuscular components in HFM.

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