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Related Experiment Videos

Overjet relapse following functional appliance therapy.

K J Drage1, N P Hunt

  • 1Eastman Dental Hospital, London.

British Journal of Orthodontics
|August 1, 1990
PubMed
Summary

Class II Division 1 malocclusion treatment with Andresen activator or Bionator primarily causes dento-alveolar changes. Relapse is mainly due to incisor inclination changes, not skeletal factors, with initial overjet showing low correlation.

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Area of Science:

  • Orthodontics
  • Dentofacial Orthopedics
  • Cephalometric Analysis

Background:

  • Class II Division 1 malocclusion is a common dental anomaly.
  • Orthodontic treatment aims to correct skeletal and dental discrepancies.
  • Understanding treatment stability and relapse is crucial for long-term outcomes.

Purpose of the Study:

  • To evaluate cephalometric changes during and after treatment of Class II Division 1 malocclusion using Andresen activator or Bionator.
  • To compare treatment effects with an untreated control group.
  • To identify factors influencing overjet relapse post-treatment.

Main Methods:

  • Cephalometric analysis of 49 patients treated with Andresen activator or Bionator.
  • Comparison with a control group of 24 untreated individuals.
  • Assessment of dento-alveolar and skeletal changes, incisor inclination, and overjet relapse.

Main Results:

  • Overjet reduction was primarily achieved through dento-alveolar changes.
  • Mean overjet relapse was minimal (0.8 mm), but with significant individual variability.
  • Incisor inclination changes, not antero-posterior skeletal changes, were associated with relapse.
  • Vertical facial pattern and growth did not influence relapse.
  • Initial overjet showed a low correlation with relapse (r=0.31).

Conclusions:

  • Andresen activator and Bionator treatments for Class II Division 1 malocclusion yield results mainly through dento-alveolar modifications.
  • Relapse is influenced by incisor repositioning rather than skeletal alterations.
  • Treatment stability is influenced by initial overjet, though correlation is weak.

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