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Related Experiment Videos

[An electromyographic study on functional adaptations--associated with herbst appliance]

S Hiyama1

  • 1Department of Orthodontics II, Tokyo Medical and Dental University, Japan.

Kokubyo Gakkai Zasshi. the Journal of the Stomatological Society, Japan
|March 1, 1996
PubMed
Summary

Functional muscular adaptation in patients with Angle Class II malocclusion showed initial increases in inferior lateral pterygoid (ILpt) muscle activity after Herbst appliance use, followed by a significant reduction. This suggests complex multifactorial effects on muscle function adaptation.

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Area of Science:

  • Orthodontics
  • Biomedical Engineering
  • Muscle Physiology

Context:

  • Angle Class II Division 1 malocclusion presents challenges in sagittal jaw relation.
  • The Herbst appliance is used to correct such jaw discrepancies.
  • Understanding masticatory muscle adaptation is crucial for treatment efficacy.

Purpose:

  • To investigate the functional muscular adaptation of masticatory muscles, specifically the inferior head of the lateral pterygoid (ILpt) muscle, to structural changes induced by the Herbst appliance.
  • To correlate electromyographic (EMG) findings with cephalometric changes in patients with Angle Class II Division 1 malocclusion.

Summary:

  • Four patients with Angle Class II Division 1 malocclusion were monitored using lateral cephalograms and intraoral surface EMG of the ILpt muscle during Herbst appliance treatment.

Related Experiment Videos

  • ILpt muscle activity initially increased post-appliance, mimicking construction bite effects, but decreased significantly after 4-6 months.
  • Cephalometric analysis revealed persistent anteroinferior condyle positions in three patients, indicating incomplete structural adaptation despite reduced muscle activity.

    • Impact:

    • Findings suggest that functional adaptation of masticatory muscles is not solely dependent on the intensity or duration of functional stimulation.
    • Highlights the complex, multifactorial nature of muscle adaptation to orthodontic-induced morphological changes.
    • Informs clinical practice regarding the long-term management and expectations of muscle function following Herbst appliance therapy.