title: Detection of proximal caries using digital radiographic systems with different resolutions.
abstract: BACKGROUND
  Dental radiography is an important tool for detection of caries and digital radiography is the latest advancement in this regard. Spatial resolution is a characteristic of digital receptors used for describing the quality of images.
  
  
  OBJECTIVE
  This study was aimed to compare the diagnostic accuracy of two digital radiographic systems with three different resolutions for detection of noncavitated proximal caries.
  
  
  METHODS
  Diagnostic accuracy.
  
  
  METHODS
  Seventy premolar teeth were mounted in 14 gypsum blocks. Digora; Optime and RVG Access were used for obtaining digital radiographs. Six observers evaluated the proximal surfaces in radiographs for each resolution in order to determine the depth of caries based on a 4-point scale. The teeth were then histologically sectioned, and the results of histologic analysis were considered as the gold standard. Data were entered using SPSS version 18 software and the Kruskal-Wallis test was used for data analysis. P <0.05 was considered as statistically significant.
  
  
  RESULTS
  No significant difference was found between different resolutions for detection of proximal caries (P > 0.05). RVG access system had the highest specificity (87.7%) and Digora; Optime at high resolution had the lowest specificity (84.2%). Furthermore, Digora; Optime had higher sensitivity for detection of caries exceeding outer half of enamel. Judgment of oral radiologists for detection of the depth of caries had higher reliability than that of restorative dentistry specialists.
  
  
  CONCLUSIONS
  The three resolutions of Digora; Optime and RVG access had similar accuracy in detection of noncavitated proximal caries.
authors.forename: Sima
authors.initials: S
authors.lastname: Nikneshan
authors.forename: Fatemeh Mashhadi
authors.initials: FM
authors.lastname: Abbas
authors.affiliation: Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Sedigheh
authors.initials: S
authors.lastname: Sabbagh
mesh_terms: D001641:Bicuspid / Q000000981:diagnostic imaging; D003731:Dental Caries / Q000000981:diagnostic imaging*; D006801:Humans; D066298:In Vitro Techniques; D019252:Radiography, Dental, Digital / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity