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Related Experiment Videos

Extractions as a form of interception in the developing dentition: a randomized controlled trial.

C H Kau1, P Durning, S Richmond

  • 1Department of Dental Health and Biological Sciences, University of Wales, College of Medicine Heath Park, Cardiff CF14 4XY, Wales, UK. Kauc@cardiff.ac.uk

Journal of Orthodontics
|June 24, 2004
PubMed
Summary

Extracting lower primary canines effectively reduces lower incisor crowding. However, this procedure also decreases arch perimeter, potentially impacting the eruption of permanent canines.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Pediatric Dentistry

Background:

  • Lower incisor crowding is a common orthodontic concern in children.
  • Primary canine extraction is a potential interceptive orthodontic strategy.
  • The efficacy of this approach requires rigorous evaluation.

Purpose of the Study:

  • To assess the effectiveness of lower primary canine extraction in alleviating labial segment crowding.
  • To compare dental arch changes between extraction and non-extraction groups.

Main Methods:

  • A randomized controlled trial involving 83 subjects across Italy, Germany, and Wales.
  • Random allocation to either primary canine extraction or non-extraction groups.
  • Two-year follow-up with dental cast analysis measuring incisor crowding, arch length, and other parameters.

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Main Results:

  • Extraction group showed a significant reduction in lower incisor crowding (6.03 mm) compared to the non-extraction group (1.27 mm).
  • Arch perimeter decreased more in the extraction group (-2.73 mm), with molars moving mesially.
  • A net space gain of 2.03 mm was observed in the extraction group.

Conclusions:

  • Lower primary canine extraction successfully reduces lower incisor crowding.
  • The procedure leads to a greater decrease in arch perimeter, potentially compromising space for permanent canine eruption.