title: [Diagnostic accuracy of orthopantomogram and periapical film in evaluating root resorption associated with orthodontic force].
abstract: OBJECTIVE
  To test the diagnostic accuracy of qualitative and semi-quantitative evaluations on root resorption associated with orthodontic force (RRAOF) using orthopantomogram (OPG) and periapical film, through comparing with assessments with cone beam computed tomography (CBCT), which is considered as the gold standard.
  
  
  METHODS
  Before and after treatment, OPG, periapical film, CBCT images of 121 upper anterior teeth in 32 orthodontic patients were obtained. Blind evaluation of RRAOF was performed according to Levander and Malmgren's method by three trained radiographers through examining three kinds of images of these teeth. The diagnostic accuracy of qualitative and semi-quantitative evaluations on RRAOF using OPG and periapical films were test through comparing with assessments with CBCT, which was considered as the gold standard.
  
  
  RESULTS
  To the same sample, the RRAOF qualitative and semi-quantitative diagnostic classification results of OPG and periapical films compared with CBCT were significant differences (P<0.05). The sensitivity of periapical films and OPG was 71.6% and 78.4%. The specificity of periapical films and OPG was 25.5% and 51.1%. The accuracy of periapical films and OPG was 53.7% and 67.8%, respectively.
  
  
  CONCLUSIONS
  Periapical films and OPG for evaluating RRAOF have a poor diagnostic accuracy.
authors.affiliation: Dept. of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Lixia
authors.initials: L
authors.lastname: Yu
authors.forename: Shushu
authors.initials: S
authors.lastname: He
authors.forename: Song
authors.initials: S
authors.lastname: Chen
mesh_terms: D054893:Cone-Beam Computed Tomography; D006801:Humans; D011862:Radiography, Panoramic; D012391:Root Resorption; D012680:Sensitivity and Specificity