title: Accuracy of CBCT images in the assessment of buccal marginal alveolar peri-implant defects: effect of field of view.
abstract: OBJECTIVE
  To investigate the reliability and accuracy of cone beam CT (CBCT) images obtained at different fields of view in detecting and quantifying simulated buccal marginal alveolar peri-implant defects.
  
  
  METHODS
  Simulated buccal defects were prepared in 69 implants inserted into cadaver mandibles. CBCT images at three different fields of view were acquired: 40 × 40, 60 × 60 and 100 × 100 mm. The presence or absence of defects was assessed on three sets of images using a five-point scale by three observers. Observers also measured the depth, width and volume of defects on CBCT images, which were compared with physical measurements. The kappa value was calculated to assess intra- and interobserver agreement. Six-way repeated analysis of variance was used to evaluate treatment effects on the diagnosis. Pairwise comparisons of median true-positive and true-negative rates were calculated by the χ² test. Pearson's correlation coefficient was used to determine the relationship between measurements. Significance level was set as p < 0.05.
  
  
  RESULTS
  All observers had excellent intra-observer agreement. Defect status (p < 0.001) and defect size (p < 0.001) factors were statistically significant. Pairwise interactions were found between defect status and defect size (p = 0.001). No differences between median true-positive or true-negative values were found between CBCT field of views (p > 0.05). Significant correlations were found between physical and CBCT measurements (p < 0.001).
  
  
  CONCLUSIONS
  All CBCT images performed similarly for the detection of simulated buccal marginal alveolar peri-implant defects. Depth, width and volume measurements of the defects from various CBCT images correlated highly with physical measurements.
authors.affiliation: Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey.
authors.forename: K
authors.initials: K
authors.lastname: Kamburoğlu
authors.forename: S
authors.initials: S
authors.lastname: Murat
authors.forename: C
authors.initials: C
authors.lastname: Kılıç
authors.forename: S
authors.initials: S
authors.lastname: Yüksel
authors.forename: H
authors.initials: H
authors.lastname: Avsever
authors.forename: A
authors.initials: A
authors.lastname: Farman
authors.forename: W C
authors.initials: WC
authors.lastname: Scarfe
mesh_terms: D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000473:pathology; D000539:Alveolar Process / Q000000981:diagnostic imaging* / Q000473:pathology; D002102:Cadaver; D054893:Cone-Beam Computed Tomography / Q000592:standards*; D015921:Dental Implants; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008336:Mandibular Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D015588:Observer Variation; D015203:Reproducibility of Results
chemical_list: D015921:Dental Implants
keywords: CBCT; FOV; peri-implant defects; radiography; voxel size