title: Number of basis images effect on detection of root fractures in endodontically treated teeth using a cone beam computed tomography machine: an in vitro study.
abstract: OBJECTIVE
  The objective of this study was to compare the accuracy of root fracture detection in endodontically treated teeth using scans acquired with a 180° rotation motion compared with a 360° after which the patient exposure and number of basis images are doubled.
  
  
  METHODS
  Sixty-six roots were collected and decoronated. All were treated endodontically. One-half of the roots were fractured, resulting in 2 root fragments which were then glued together. The roots were placed randomly in 8 prepared beef rib fragments. Five reviewers independently reviewed the scans twice, at different times.
  
  
  RESULTS
  The specificity of the 360° scan was significantly higher than the 180° scan; doubling the basis images leads to a significant decrease in false-positive rates. Accuracy and sensitivity were not significantly different.
  
  
  CONCLUSIONS
  Only the specificity is improved by the increased rotation and doubling of images. The accuracy and sensitivity are not improved.
authors.affiliation: Oral and Maxillofacial Radiology, Department of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA. boulosbchara@hotmail.com
authors.forename: Boulos
authors.initials: B
authors.lastname: Bechara
authors.forename: C Alex
authors.initials: CA
authors.lastname: McMahan
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Nasseh
authors.forename: Hassem
authors.initials: H
authors.lastname: Geha
authors.forename: Elie
authors.initials: E
authors.lastname: Hayek
authors.forename: Georges
authors.initials: G
authors.lastname: Khawam
authors.forename: Michel
authors.initials: M
authors.lastname: Raad
authors.forename: Marcel
authors.initials: M
authors.lastname: Noujeim
mesh_terms: D019540:Area Under Curve; D054893:Cone-Beam Computed Tomography / Q000706:statistics & numerical data*; D005189:False Positive Reactions; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000706:statistics & numerical data*; D021621:Imaging, Three-Dimensional / Q000706:statistics & numerical data; D015588:Observer Variation; D012372:ROC Curve; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012390:Root Canal Therapy / Q000379:methods; D012399:Rotation; D012680:Sensitivity and Specificity; D014082:Tooth Fractures / Q000000981:diagnostic imaging*; D014092:Tooth Root / Q000000981:diagnostic imaging / Q000293:injuries*; D019553:Tooth, Nonvital / Q000000981:diagnostic imaging*
chemical_list: D012387:Root Canal Filling Materials; D006171:Gutta-Percha