title: Detection of radiolucencies around endodontically treated teeth on routine CT scans.
abstract: OBJECTIVE
  This retrospective study compared computed tomography (CT) imaging to routine dental periapical radiographs in diagnosing radiolucencies around endodontically treated teeth.
  
  
  METHODS
  Of the 244 CT scans evaluated, 104 had no teeth on the scan. On the remaining 140 scans, 353 teeth fell into the following categories: 59 maxillary molars, 30 mandibular molars, 66 maxillary premolars, 56 mandibular premolars, and 141 anterior teeth. Positive and negative predictive values were calculated, as were sensitivity, specificity, and prevalence assuming the CT scan was the test standard.
  
  
  RESULTS
  For the total tooth population periapical radiograph - CT slice sensitivity was 52, specificity was 90, the positive predictive value (PPV) was 97, the negative predictive value (NPV) was 25, and the prevalence 85.
  
  
  CONCLUSIONS
  In the population studied, the CT scan had a greater ability to show radiolucencies that were not evident on periapical radiographs.
authors.affiliation: Department of Prosthodontics, College of Dentistry, New York University, New York, NY.
authors.forename: Gary R
authors.initials: GR
authors.lastname: Goldstein
authors.forename: Shanker
authors.initials: S
authors.lastname: Iyer
authors.forename: Phuong D
authors.initials: PD
authors.lastname: Doan
authors.forename: Sandra
authors.initials: S
authors.lastname: Scibetta
mesh_terms: D019937:Diagnostic Techniques and Procedures / Q000295:instrumentation* / Q000706:statistics & numerical data*; D006801:Humans; D010483:Periapical Diseases / Q000000981:diagnostic imaging*; D015995:Prevalence; D011861:Radiography, Dental / Q000295:instrumentation* / Q000379:methods* / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods* / Q000706:statistics & numerical data*; D014070:Tooth; D019227:Tooth Apex / Q000000981:diagnostic imaging / Q000473:pathology; D019553:Tooth, Nonvital / Q000000981:diagnostic imaging*
keywords: CT scans; computed tomography; endodontics; periapical radiographs; radiographs; radiolucencies; sensitivity; specificity