A SENSITOMETRIC COMPARISON OF 4 DENTAL-X-RAY FILMS AND THEIR DIAGNOSTIC-ACCURACY

Objectives: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 extracte d premolars with known pathology were radiographed under standardized conditions and the radiographs assessed by nine observers for approxim al caries, Receiver Operating Characteristic (ROC) curve technique was used to analyse the diagnostic accuracy. Results: The sensitometric a nalysis showed that the Ektaspeed Plus film had the highest speed of t he 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 bef ore expiry date. There were no statistically significant differences i n diagnostic accuracy for white spot lesions between the four films. F or cavitations there was a significant difference between EV 57 and DV 57 and Ektaspeed Plus (P = 0.005) but not between Ultra-speed and Ekt aspeed Plus nor between Ultra-speed and EV 57 and DV 57. Conclusion: E ktaspeed Plus film is comparable with D-speed and a conventional D-spe ed film. Since it is at present the fastest available dental film it s hould be recommended for general dental practice.