The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Evaluation of alveolar bone loss following rapid maxillary expansion using cone-beam computed tomography

  • Baysal, Asli (Department of Orthodontics, Faculty of Dentistry, Izmir Katip Celebi University) ;
  • Uysal, Tancan (Department of Orthodontics, Faculty of Dentistry, Izmir Katip Celebi University) ;
  • Veli, Ilknur (Department of Orthodontics, Faculty of Dentistry, Izmir Katip Celebi University) ;
  • Ozer, Torun (Department of Orthodontics, Faculty of Dentistry, Adnan Menderes University) ;
  • Karadede, Irfan (Department of Orthodontics, Faculty of Dentistry, Dicle University) ;
  • Hekimoglu, Seyit (Private Practice)
  • Received : 2012.05.29
  • Accepted : 2012.10.18
  • Published : 2013.04.25
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Abstract

Objective: To evaluate the changes in cortical bone thickness, alveolar bone height, and the incidence of dehiscence and fenestration in the surrounding alveolar bone of posterior teeth after rapid maxillary expansion (RME) treatment using cone-beam computed tomography (CBCT). Methods: The CBCT records of 20 subjects (9 boys, mean age: $13.97{\pm}1.17$ years; 11 girls, mean age: $13.53{\pm}2.12$ year) that underwent RME were selected from the archives. CBCT scans had been taken before (T1) and after (T2) the RME. Moreover, 10 of the subjects had 6-month retention (T3) records. We used the CBCT data to evaluate the buccal and palatal aspects of the canines, first and second premolars, and the first molars at 3 vertical levels. The cortical bone thickness and alveolar bone height at T1 and T2 were evaluated with the paired-samples t-test or the Wilcoxon signed-rank test. Repeated measure ANOVA or the Friedman test was used to evaluate the statistical significance at T1, T2, and T3. Statistical significance was set at p < 0.05. Results: The buccal cortical bone thickness decreased gradually from baseline to the end of the retention period. After expansion, the buccal alveolar bone height was reduced significantly; however, this change was not statistically significant after the 6-month retention period. During the course of the treatment, the incidence of dehiscence and fenestration increased and decreased, respectively. Conclusions: RME may have detrimental effects on the supporting alveolar bone, since the thickness and height of the buccal alveolar bone decreased during the retention period.

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References

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