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[Study on the dental arch width in Class II malocclusion].

Jian-ping Xu1, Pei-ming Shen

  • 1Department of Dentistry, First People's Hospital of Kunshan, Jiangsu Province, China. xujianping88@hotmail.com

Shanghai Kou Qiang Yi Xue = Shanghai Journal of Stomatology
|January 10, 2006
PubMed
Summary

Class II division 1 and Class II division 2 malocclusions exhibit narrower dental arch dimensions, particularly in the maxilla and mandible for Class II division 2. Arch expansion is often clinically indicated for these conditions.

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Area of Science:

  • Orthodontics
  • Dental Morphology
  • Craniofacial Development

Background:

  • Malocclusion, specifically Class II, affects dental arch dimensions.
  • Understanding transverse discrepancies is crucial for effective orthodontic treatment planning.

Purpose of the Study:

  • To compare the transverse dimensions of dental arches in Class II division 1 and Class II division 2 malocclusion groups with mild Class I malocclusion.
  • To identify specific arch width differences between these malocclusion types.

Main Methods:

  • Dental casts from 120 subjects (40 each of mild Class I, Class II division 1, and Class II division 2 malocclusions) were analyzed.
  • Transverse dental arch widths were measured at the canine, premolar, and molar regions.
  • Independent-samples t-tests were used for statistical comparisons.

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Main Results:

  • Class II division 1 subjects showed narrower maxillary arch widths compared to Class I, though not statistically significant.
  • Class II division 2 subjects exhibited significantly narrower maxillary and mandibular arch widths than Class I.
  • Mandibular arch width was significantly greater in Class II division 1 than Class II division 2 malocclusions.

Conclusions:

  • Insufficient transverse development of dental arches is noted in the maxilla for Class II division 1 and in both maxilla and mandible for Class II division 2 malocclusions.
  • Orthodontic intervention, such as upper arch expansion for Class II division 1 and both upper and lower arch expansion for Class II division 2, is frequently indicated.