title: Reliability of CBCT in the diagnosis of dental asymmetry.
abstract: OBJECTIVE
  The aim of this study was to validate a method used to assess dental asymmetry, in relation to the skeletal midline, by means of CBCT.
  
  
  METHODS
  Ten patients who had CBCT scans taken were randomly selected for this study. Five different observers repeated 10 landmarks (x, y and z variables for each) and 12 linear measurements within 10 days. Measurements were taken in both arches to evaluate symmetry of first molars, canines and dental midline in relation to the skeletal midline. Intraclass correlation coefficient (ICC) was carried out to assess intra- and interobserver reliability for landmarks and distances. Average mean difference was also assessed to check measurement errors between observers.
  
  
  RESULTS
  ICC for the landmarks was, respectively, ≥ 0.9 for 27 (90%) and 25 (83%) variables for intra- and interobserver; ICC for distances was ≥ 0.9 for 7 (58%) and 5 (42%), respectively. All ICC landmarks for distances were >0.75 for both intra- and interobserver. The mean difference between observers was ≤ 0.6 mm for all the distances.
  
  
  CONCLUSIONS
  The method used to assess dental asymmetry by means of CBCT is valid. Measurements of molars, canines and dental midline symmetry with the skeletal midline are reproducible and reliable when taken by means of CBCT and by different operators.
authors.forename: Antônio Carlos de Oliveira
authors.initials: AC
authors.lastname: Ruellas
authors.forename: Leonardo
authors.initials: L
authors.lastname: Koerich
authors.forename: Carolina
authors.initials: C
authors.lastname: Baratieri
authors.forename: Claudia Trindade
authors.initials: CT
authors.lastname: Mattos
authors.forename: Matheus
authors.initials: M
authors.lastname: Alves
authors.forename: Daniel
authors.initials: D
authors.lastname: Brunetto
authors.forename: Lindsey
authors.initials: L
authors.lastname: Eidson
mesh_terms: D059925:Anatomic Landmarks / Q000000981:diagnostic imaging; D002508:Cephalometry / Q000706:statistics & numerical data*; D054893:Cone-Beam Computed Tomography / Q000706:statistics & numerical data*; D003481:Cuspid / Q000000981:diagnostic imaging; D003724:Dental Arch / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000706:statistics & numerical data; D007180:Incisor / Q000000981:diagnostic imaging; D008310:Malocclusion / Q000000981:diagnostic imaging*; D008334:Mandible / Q000000981:diagnostic imaging; D008437:Maxilla / Q000000981:diagnostic imaging; D008963:Molar / Q000000981:diagnostic imaging; D009295:Nasal Bone / Q000000981:diagnostic imaging; D015588:Observer Variation; D015203:Reproducibility of Results; D019228:Tooth Crown / Q000000981:diagnostic imaging*
keywords: Cone-beam computed tomography; Dental arch; Imaging; Three-dimensional diagnosis