title: Nasal airway changes in bone-borne and tooth-borne rapid maxillary expansion treatments.
abstract: BACKGROUND
  Our aim was to determine the presence of a correlation between the nasal airway skeletal transverse dimension and air intake changes in rapid maxillary expansion treatments.
  
  
  METHODS
  Sixty-one patients with maxillary transverse deficiency (11-17 years old) were randomly allocated into three groups (two treatment groups - tooth- [hyrax] or bone-borne [miniscrew-implant-based] expander - and one control group). Cone-beam computed tomography scans (CBCT) were obtained from each patient as well as acoustic rhinometry (AR) readings. Specifically, in AR, airway volume up to minimum cross-sectional areas (Vol. 1&2) and minimum cross-sectional areas (Min. 1&2) in the nasal cavity were measured. Records were obtained at two time points (initial T1 and at removal of appliance at 6 months T2). CBCTs were analyzed using AVIZO software and landmarks were placed on the nasal base. Descriptive statistics were compiled and student's t-test was used.
  
  
  RESULTS
  Of the 480 pairings measured, only 9 showed statistically significant positive correlations between T1 and T2. Correlation data were highly variable in all categories, showing no clear tendencies. No statistical difference was found when comparing all groups in terms of airway changes.
  
  
  CONCLUSIONS
  With very few positive correlations observed and otherwise highly variable data, no really conclusive finding was obtained to suggest any realistic correlation between changes in the skeletal dimensions and changes in the nasal airway.
authors: School of Dentistry, University of Alberta, Edmonton, AB, Canada T5G 2N8.
authors: Ousama
authors: O
authors: Kabalan
authors: University of Toronto Faculty of Dentistry, 124, Edward Street, Toronto, ON, Canada M5G 1G6.
authors: Jillian
authors: J
authors: Gordon
authors: School of Dentistry, University of Alberta, Edmonton, AB, Canada T5G 2N8.
authors: Giseon
authors: G
authors: Heo
authors: School of Dentistry, University of Alberta, Edmonton, AB, Canada T5G 2N8. Electronic address: manuel@ualberta.ca.
authors: Manuel O
authors: MO
authors: Lagravère
mesh_terms: D000293:Adolescent; D059925:Anatomic Landmarks / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D019412:Anatomy, Cross-Sectional / Q000379:methods; D001863:Bone Screws; D002648:Child; D054893:Cone-Beam Computed Tomography / Q000379:methods; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008904:Miniaturization; D009296:Nasal Cavity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D009929:Organ Size; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation; D016382:Orthodontic Appliance Design; D010155:Palatal Expansion Technique / Q000295:instrumentation*; D012123:Pulmonary Ventilation / Q000502:physiology; D023842:Rhinometry, Acoustic / Q000379:methods
keywords: Cone-beam computer tomography; Nasal airway; Rapid maxillary expansion