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Masticatory muscle right-left differences in controls and hemifacial microsomia patients.

Clara E Huisinga-Fischer1, J Michiel Vaandrager, Birte Prahl-Andersen

  • 1Department of Orthodontics, Academic Center for Dentistry, Amsterdam, The Netherlands. c.fischer@acta.nl

The Journal of Craniofacial Surgery
|January 6, 2004
PubMed
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Children with hemifacial microsomia show significant asymmetry in masticatory muscle volume, approximately 10 times greater than normal variations. This study found no evidence of compensatory muscle growth on the unaffected side in these patients.

Area of Science:

  • Craniofacial anatomy
  • Pediatric imaging
  • Biomechanical analysis

Background:

  • Masticatory muscle volume assessment is crucial for differentiating normal variations from pathological differences.
  • Hemifacial microsomia (HFM) presents with unilateral facial underdevelopment, impacting masticatory structures.
  • Understanding muscle volume asymmetry aids in evaluating compensatory mechanisms in HFM.

Purpose of the Study:

  • To establish normative right-left masticatory muscle volume differences in healthy children.
  • To compare masticatory muscle volume in HFM patients with controls to test the compensation hypothesis.
  • To identify potential pathological differences in muscle volume related to HFM.

Main Methods:

  • Computed tomography (CT) scans were utilized to measure masticatory muscle volumes.

Related Experiment Videos

  • A cohort of 39 children with HFM and 52 healthy children were included.
  • Quantitative analysis of muscle volume differences between sides and groups was performed.

    • Main Results:

    • Normal right-left masticatory muscle volume differences in controls ranged from 2.57% to 2.88%.
    • HFM patients exhibited relative volume differences approximately 10 times larger than controls.
    • Age was the only significant factor affecting masticatory muscle volume differences multivariately (P < 0.001).

    Conclusions:

    • Hemifacial microsomia is associated with significant masticatory muscle volume asymmetry.
    • No evidence of compensatory hypertrophy was observed on the nonaffected side in HFM patients.
    • Normative data established can help distinguish pathological asymmetry from normal variations.