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Related Experiment Videos

Mandibular displacement in Angle Class II, division 2 malocclusion.

A Demisch1, B Ingervall, U Thüer

  • 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, 1992
PubMed
Summary

This study investigated Angle Class II, Division 2 malocclusion treatment in children. Findings suggest the mandible is not posteriorly displaced in this malocclusion, challenging previous assumptions.

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Area of Science:

  • Orthodontics
  • Dental Morphology
  • Cephalometric Analysis

Background:

  • Angle Class II, Division 2 malocclusion is characterized by specific dental and skeletal features.
  • Understanding the true mandibular position in this malocclusion is crucial for effective treatment planning.

Purpose of the Study:

  • To evaluate the treatment effects on Angle Class II, Division 2 malocclusion in children.
  • To investigate the relationship between retruded (RCP) and intercuspal (ICP) mandibular positions during treatment.
  • To determine if the mandible is posteriorly displaced in Class II, Division 2 malocclusion.

Main Methods:

  • X-ray cephalometry and analysis of RCP-ICP relationship in 22 children.
  • Three-phase treatment involving upper incisor proclination, deep bite correction, distal occlusion correction, and retention.

Related Experiment Videos

  • Recording RCP-ICP distance using wax bites and dental casts in a modified gnathothesiometer.

    • Main Results:

    • The anteroposterior distance between RCP and ICP was initially large.
    • This distance remained unchanged after initial treatment phases (incisor proclination, deep bite correction).
    • The RCP-ICP distance decreased after distal occlusion correction and slightly increased during retention.

    Conclusions:

    • Treatment of Angle Class II, Division 2 malocclusion with the described methods did not result in mandibular anterior positioning.
    • The findings suggest that the mandible is not posteriorly displaced in Class II, Division 2 malocclusion.
    • This challenges the traditional understanding of mandibular positioning in this malocclusion type.