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Related Experiment Videos

Dental arch width in Class II Division 2 deep-bite malocclusion.

Todd M Walkow1, Sheldon Peck

  • 1Oral and Developmental Biology (Orthodontics), Harvard School of Dental Medicine, Boston, MA, USA. twalkow@yahoo.com

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 20, 2002
PubMed
Summary

Severe deep bite malocclusion, known as cover-bite, shows normal upper arch width but a narrower lower arch between canines. This mandibular width difference contributes to lower incisor crowding in Angle's Class II Division 2 (II/2) cases.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Dental Morphology

Background:

  • Angle's Class II Division 2 (II/2) malocclusion, termed cover-bite, presents a severe deep overbite.
  • This malocclusion is associated with specific skeletal and dental features, including hypodivergence and incisor retroclination.

Purpose of the Study:

  • To investigate and compare dental arch widths in patients with II/2 cover-bite malocclusion.
  • To identify transverse discrepancies that may contribute to the characteristic features of this malocclusion.

Main Methods:

  • Dental casts from 23 subjects with II/2 cover-bite malocclusions were analyzed.
  • Maxillary and mandibular arch widths (intermolar and intercanine) were measured.
  • Measurements were compared to a control group of 46 age- and gender-matched orthodontic patients.

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Main Results:

  • Intermolar widths in both arches and maxillary intercanine width were similar between the cover-bite group and controls.
  • A statistically significant reduction in mandibular intercanine width was observed in the II/2 cover-bite group compared to controls (P =.01).

Conclusions:

  • II/2 cover-bite malocclusion exhibits normal transverse dimensions in the maxilla and mandibular posterior segments.
  • Underdevelopment of the mandibular arch width between the canines is a key characteristic, likely causing incisor crowding.
  • Anterior expansion of the mandibular arch is a recommended orthodontic treatment strategy to address crowding and potentially avoid extractions.