title: A sensitometric comparison of four dental X-ray films and their diagnostic accuracy.
abstract: OBJECTIVE
  To compare the sensitometric properties and accuracy in the diagnosis of approximal caries of two E-speed (Ektaspeed Plus and EV 57) and two D-speed (Ultra-speed and DV 57) films.
  
  
  METHODS
  Speed and contrast for the four films were determined following 30 exposures for each film. Base plus fog density was measured on unexposed films and the increase was studied over a 18-month period. Seventy-five extracted premolars with known pathology were radiographed under standardized conditions and the radiographs assessed by nine observers for approximal caries. Receiver Operating Characteristic (ROC) curve technique was used to analyse the diagnostic accuracy.
  
  
  RESULTS
  The sensitometric analysis showed that the Ektaspeed Plus film had the highest speed of the four films. At a density of 1.0 it was 2.28 times faster than Ultra-speed. The contrast of Ektaspeed Plus was comparable with that of the other films and base plus fog density plateaued at 0.4 ten months before expiry date. There were no statistically significant differences in diagnostic accuracy for white spot lesions between the four films. For cavitations there was a significant difference between EV 57 and DV 57 and Ektaspeed Plus (P = 0.005) but not between Ultra-speed and Ektaspeed Plus nor between Ultra-speed and EV 57 and DV 57.
  
  
  CONCLUSIONS
  Ektaspeed Plus film is comparable with D-speed and a conventional E-speed film. Since it is at present the fastest available dental film it should be recommended for general dental practice.
authors.affiliation: Department of Oral Radiology, Postgraduate Dental Education Center, Orebro, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Svenson
authors.forename: U
authors.initials: U
authors.lastname: Welander
authors.forename: X Q
authors.initials: XQ
authors.lastname: Shi
authors.forename: H
authors.initials: H
authors.lastname: Stamatakis
authors.forename: G
authors.initials: G
authors.lastname: Tronje
mesh_terms: D000704:Analysis of Variance; D003731:Dental Caries / Q000000981:diagnostic imaging*; D005189:False Positive Reactions; D006801:Humans; D015588:Observer Variation; D012372:ROC Curve; D011861:Radiography, Dental / Q000295:instrumentation; D011874:Radiometry; D012044:Regression Analysis; D015203:Reproducibility of Results; D014962:X-Ray Film