The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Changes in mandibular transversal arch dimensions after rapid maxillary expansion procedure assessed through cone-beam computed tomography

급속 구개확장 후 하악골 폭경변화에 대한 콘빔씨티를 이용한 평가

  • Baysal, Asli (Department of Orthodontics, Faculty of Dentistry, Kocaeli University) ;
  • Veli, Ilknur (Department of Orthodontics, Faculty of Dentistry, Dicle University) ;
  • Ucar, Faruk Izzet (Department of Orthodontics, Faculty of Dentistry, Erciyes University) ;
  • Eruz, Murat (Department of Orthodontics, Faculty of Dentistry, Erciyes University) ;
  • Ozer, Torun (Department of Orthodontics, Faculty of Dentistry, Dicle University) ;
  • Uysal, Tancan (Department of Orthodontics, Faculty of Dentistry, Izmir Katip Celebi University)
  • Received : 2011.02.12
  • Accepted : 2011.04.05
  • Published : 2011.06.30
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Abstract

Objective: This study aimed at evaluating the changes in mandibular arch widths and buccolingual inclinations of mandibular posterior teeth after rapid maxillary expansion (RME). Methods: Baseline and post-expansion cone-beam computed tomographic (CBCT) images of patients who initially had bilateral posterior cross-bite and underwent RME with a banded-type expander were assessed in this study. The patients included 9 boys (mean age: $13.97{\pm}1.17$ years) and 11 girls (mean age: $13.53{\pm}2.12$ years). Images obtained 6 months after retention were available for 10 of these patients. Eighteen angular and 43 linear measurements were performed for the maxilla and mandible. The measurements were performed on frontally clipped images at the following time points; before expansion (T1), after expansion (T2), and after retention (T3). Statistical significance was assessed with paired sample $t$-test at $p$ < 0.05. Results: T1-T2 comparisons showed statistically significant post-RME increases for all measurements; similarly, T2-T1 and T3-T1 comparisons showed statistically significant changes. The maxillary linear and angular measurements showed decreases after expansion, and mandibular linear and angular measurements increased after retention. Conclusion: All mandibular arch widths increased and mandibular posterior teeth were uprighted after RME procedure.

Keywords

References

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