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Updated: Mar 28, 2026

Ye's Swing Technique for Small-incision Lenticule Extraction Surgery
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Published on: June 27, 2025

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Stability of extraction space closure.

Daniela Gamba Garib1, Larissa Borges Bressane2, Guilherme Janson3

  • 1Associate professor, Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.

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 1, 2016
PubMed
Summary
This summary is machine-generated.

Extraction space reopening is common after orthodontic treatment for Class I malocclusion, affecting over 30% of patients. While spaces reopen initially, they tend to close by five years post-treatment.

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Area of Science:

  • Orthodontics
  • Dental Cast Analysis
  • Cephalometric Radiography

Background:

  • Extraction space reopening is a potential complication following orthodontic treatment.
  • Understanding its prevalence and long-term behavior is crucial for patient management.

Purpose of the Study:

  • To determine the prevalence of extraction space reopening in Class I malocclusion patients.
  • To analyze the long-term changes in these spaces after orthodontic treatment.
  • To identify factors associated with space reopening.

Main Methods:

  • Retrospective analysis of 43 patients with Class I malocclusion.
  • Evaluation of dental casts and cephalometric radiographs at multiple time points (treatment onset, post-treatment, 1 and 5 years post-debonding).
  • Statistical analysis using Cochran and t tests to assess space reopening and associated factors.

Main Results:

  • Over 30% of patients experienced extraction space reopening.
  • Space reopening increased significantly from post-treatment to 1 year post-debonding.
  • Spaces tended to decrease in size between 1 and 5 years post-debonding.
  • Less initial crowding and greater incisor retraction were associated with space reopening.

Conclusions:

  • A high prevalence of extraction space reopening was observed one year after treatment.
  • These spaces demonstrated a tendency to self-correct by five years post-treatment.