title: Cone-beam computed tomography evaluation of dentoskeletal changes after asymmetric rapid maxillary expansion.
abstract: BACKGROUND
  The aims of this study were to quantitatively evaluate the changes in arch widths and buccolingual inclinations of the posterior teeth after asymmetric rapid maxillary expansion (ARME) and to compare the measurements between the crossbite and the noncrossbite sides with cone-beam computed tomography (CBCT).
  
  
  METHODS
  From our clinic archives, we selected the CBCT records of 30 patients with unilateral skeletal crossbite (13 boys, 14.2 ± 1.3 years old; 17 girls, 13.8 ± 1.3 years old) who underwent ARME treatment. A modified acrylic bonded rapid maxillary expansion appliance including an occlusal locking mechanism was used in all patients. CBCT records had been taken before ARME treatment and after a 3-month retention period. Fourteen angular and 80 linear measurements were taken for the maxilla and the mandible. Frontally clipped CBCT images were used for the evaluation. Paired sample and independent sample t tests were used for statistical comparisons.
  
  
  RESULTS
  Comparisons of the before-treatment and after-retention measurements showed that the arch widths and buccolingual inclinations of the posterior teeth increased significantly on the crossbite side of the maxilla and on the noncrossbite side of the mandible (P <0.05). Comparison of the 2 sides showed statistically significant differences in both the maxilla and the mandible (P <0.05).
  
  
  CONCLUSIONS
  After ARME treatment, the crossbite side of the maxilla and the noncrossbite side of the mandible were more affected than were the opposite sides.
authors.affiliation: Assistant professor, Department of Orthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey. Electronic address: mugen97@hotmail.com.
authors.forename: Zeliha Muge
authors.initials: ZM
authors.lastname: Baka
authors.affiliation: Assistant professor, Department of Orthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Akin
authors.affiliation: Assistant professor, Department of Orthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey.
authors.forename: Faruk Izzet
authors.initials: FI
authors.lastname: Ucar
authors.affiliation: Assistant professor, Department of Orthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey.
authors.forename: Zehra
authors.initials: Z
authors.lastname: Ileri
mesh_terms: D000293:Adolescent; D000539:Alveolar Process / Q000000981:diagnostic imaging; D059925:Anatomic Landmarks / Q000000981:diagnostic imaging; D001641:Bicuspid / Q000000981:diagnostic imaging; D002508:Cephalometry / Q000379:methods*; D002648:Child; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003481:Cuspid / Q000000981:diagnostic imaging; D003724:Dental Arch / Q000000981:diagnostic imaging; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008310:Malocclusion / Q000000981:diagnostic imaging / Q000628:therapy*; D008334:Mandible / Q000000981:diagnostic imaging; D008437:Maxilla / Q000000981:diagnostic imaging; D008963:Molar / Q000000981:diagnostic imaging; D009296:Nasal Cavity / Q000000981:diagnostic imaging; D016382:Orthodontic Appliance Design; D018704:Orthodontic Retainers; D010155:Palatal Expansion Technique / Q000295:instrumentation; D021362:Palate, Hard / Q000000981:diagnostic imaging; D012189:Retrospective Studies; D019227:Tooth Apex / Q000000981:diagnostic imaging