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Related Experiment Videos

Does the mandible alter its functional position during activator treatment?

U Thüer1, B Ingervall, W Bürgin

  • 1Department of Orthodontics, University of Bern, Switzerland.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|December 1, 1989
PubMed
Summary

This study found that wearing an activator for Angle Class II, Division 1 malocclusion did not significantly alter mandibular positioning or movement during activator-free periods in children. Freeway space increased, but no forward mandibular repositioning was observed.

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Area of Science:

  • Orthodontics
  • Craniofacial Biology
  • Pediatric Dentistry

Background:

  • Angle Class II, Division 1 malocclusion is common in children.
  • Activator therapy is a common orthodontic treatment for this condition.
  • Understanding mandibular behavior during activator-free periods is crucial for treatment efficacy.

Purpose of the Study:

  • To investigate changes in mandibular position and movement during activator-free periods.
  • To assess the effect of activator wear on mandibular kinematics.
  • To determine if activator therapy induces forward mandibular repositioning.

Main Methods:

  • Sirognathograph was used to record mandibular movements and positions.
  • Measurements included movement capacity, rest position, and tooth contact point during chewing.

Related Experiment Videos

  • Data collected before and during the first year of activator treatment in 21 children.

    • Main Results:

    • No significant changes in overall mandibular movement capacity were observed, except for a slight increase in maximal protrusion.
    • The anteroposterior mandibular rest position remained constant.
    • Freeway space increased during treatment, but no changes in the tooth contact point during chewing were detected.

    Conclusions:

    • Activator therapy for Angle Class II, Division 1 malocclusion does not appear to induce a forward repositioning of the mandible in activator-free intervals.
    • Observed increases in freeway space warrant further investigation.
    • Mandibular kinematics remain largely unaffected by activator wear during the initial treatment year.