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Related Experiment Videos

Third molar availability in Class II subdivision malocclusion.

Guilherme Janson1, Karina Santana Cruz, Sérgio Estelita Cavalcante Barros

  • 1Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil. jansong@travelnet.com.br

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|September 11, 2007
PubMed
Summary

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Patients with Class II subdivision malocclusion exhibit asymmetric retromolar space and mandibular third molar angulation. This asymmetry is more pronounced in the malocclusion group compared to controls, particularly in retromolar space.

Area of Science:

  • Orthodontics
  • Dental Anatomy
  • Cephalometrics

Background:

  • Class II subdivision malocclusion presents unique dental arch characteristics.
  • Understanding asymmetry in developing dentition is crucial for treatment planning.

Purpose of the Study:

  • To compare retromolar available space and third molar angulation between Class I and Class II sides in Class II subdivision malocclusion.
  • To evaluate asymmetry in these parameters between malocclusion and normal occlusion groups.

Main Methods:

  • Retrospective analysis of corrected oblique radiographs from 46 subjects (29 with Class II subdivision malocclusion, 17 controls).
  • Measurement of retromolar available space and third molar angulation on Class I and Class II sides.
  • Statistical comparison using paired t-tests, Wilcoxon tests, independent t-tests, and Mann-Whitney tests.

Related Experiment Videos

Main Results:

  • Significant differences in retromolar available space were found between Class I and Class II sides in the malocclusion group.
  • Significant angular asymmetry of mandibular third molars was observed between sides in the malocclusion group.
  • Retromolar space asymmetry was significantly different between the malocclusion and control groups, but third molar angular asymmetry was not.

Conclusions:

  • Class II subdivision malocclusion is characterized by asymmetric maxillary and mandibular retromolar spaces.
  • Asymmetric angulation of mandibular third molars is also a feature of this malocclusion.
  • These asymmetries highlight the need for individualized orthodontic assessment and treatment.