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Related Experiment Videos

Extraction vs nonextraction: arch widths and smile esthetics.

Eunkoo Kim1, Anthony A Gianelly

  • 1US Air Force, PSC 80 16034, APO AP, Japan.

The Angle Orthodontist
|August 28, 2003
PubMed
Summary

Tooth extraction in orthodontics does not decrease arch width at a constant depth. Smile aesthetics remain comparable between extraction and non-extraction treatment groups, challenging previous assumptions.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Dental Aesthetics

Background:

  • Orthodontic treatment often involves the extraction of first premolars.
  • The impact of premolar extraction on dental arch width and smile aesthetics is a subject of ongoing research.
  • Understanding these changes is crucial for optimizing treatment outcomes.

Purpose of the Study:

  • To investigate the effect of first premolar extraction on dental arch width.
  • To compare arch width changes between extraction and non-extraction orthodontic treatments.
  • To evaluate the influence of extraction on smile aesthetics.

Main Methods:

  • Randomly selected dental casts from 30 extraction and 30 non-extraction patients.
  • Measurement of arch widths (intercanine, interpremolar, intermolar) from cusp tips.
  • Measurement of arch width at a constant depth from incisal surfaces.
  • Aesthetic evaluation of smiles from standardized photographs by 50 laypersons.

Main Results:

  • Intercanine width showed minimal increase (<1 mm) with no significant difference between groups.
  • Intermolar and interpremolar widths decreased in the extraction group but increased in the non-extraction group.
  • At a constant arch depth, extraction group arches were significantly wider (1.8 mm mandible, 1.7 mm maxilla).
  • Smile aesthetics and teeth display during smiling did not differ between groups.

Conclusions:

  • Premolar extraction does not reduce arch width when measured at a constant depth.
  • Orthodontic extraction treatment does not negatively impact smile aesthetics compared to non-extraction treatment.
  • These findings suggest that arch width can be maintained or even increased at a constant depth post-extraction.

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