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Related Experiment Videos

Analysis of activator treatment changes.

H A Hashim1

  • 1Faculty of Dentistry, University of Malaya, Kuala Lumpur.

Australian Orthodontic Journal
|October 1, 1991
PubMed
Summary
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Functional appliance treatment for Class II malocclusions primarily causes tooth movement, not significant jaw growth. Activator appliances showed minor orthopedic effects on the maxilla but no substantial mandibular advancement beyond normal growth.

Area of Science:

  • Orthodontics
  • Dental Research
  • Craniofacial Development

Background:

  • Functional appliance treatment is widely used for Class II malocclusions in growing patients.
  • Varied findings exist regarding the specific orthodontic and orthopedic contributions of these appliances.
  • A lack of consensus persists on the precise nature of treatment effects.

Purpose of the Study:

  • To quantify the orthodontic and orthopedic changes induced by activator appliance treatment.
  • To differentiate between tooth movement and skeletal changes in Class II correction.
  • To analyze the effects on maxillary and mandibular growth relative to the cranial base.

Main Methods:

  • Analysis of lateral cephalometric radiographs from 36 patients treated with activator appliances.

Related Experiment Videos

  • Utilized a modified Johnston analysis to separate tooth movement from jaw growth.
  • Measured changes relative to the cranial base and inter-jaw relationships.

    • Main Results:

    • Treatment effects were predominantly dentoalveolar, involving tooth movement.
    • A minor orthopedic effect was observed on the maxilla.
    • No significant mandibular growth exceeding normal developmental patterns was detected.

    Conclusions:

    • Functional appliance treatment, specifically with activators, yields mainly dentoalveolar changes in Class II correction.
    • The orthopedic contribution to Class II correction is limited, with minimal maxillary effect and no significant mandibular growth stimulation.
    • Further research is needed to fully elucidate the mechanisms and extent of orthopedic effects in functional appliance therapy.