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Related Experiment Videos

Arch width after extraction and nonextraction treatment.

Anthony A Gianelly1

  • 1Department of Orthodontics, Boston University School of Dental Medicine, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|January 18, 2003
PubMed
Summary

Orthodontic extraction treatment does not lead to narrower dental arches. A study comparing patients who had teeth removed with those who did not found no significant difference in arch width.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Dental Arch Dimensions

Background:

  • A common criticism of orthodontic extraction treatment is that it leads to narrower dental arches compared to nonextraction therapy.
  • This study investigates the validity of this long-held belief in orthodontic treatment planning.

Purpose of the Study:

  • To statistically compare anterior and posterior arch widths in patients treated with and without first-premolar extractions.
  • To determine if orthodontic extractions result in narrower dental arches.

Main Methods:

  • Measurements of maxillary and mandibular arch widths were taken from posttreatment study models of 25 patients treated with extractions and 25 patients treated without extractions.
  • Arch widths were measured in the canine and molar regions.

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  • Statistical analysis was performed to compare the groups.

    • Main Results:

    • No significant differences were found in anterior and posterior arch widths between the extraction and nonextraction groups.
    • The mandibular intercanine dimension was found to be 0.94 mm larger in the extraction group (P <.01).

    Conclusions:

    • Orthodontic extraction treatment does not result in narrower dental arches compared to nonextraction treatment.
    • The findings challenge the common criticism regarding arch narrowing after orthodontic extractions.