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