Intraoral digital system
Springer Online Journal Archives 1860-2000
Abstract Digital imaging systems for use in intraoral radiography are becoming common in clinical practice, although its physical properties such as resolution and available dynamic range may be inferior to conventional film systems. The purpose of this study was to determine the diagnostic accuracy in detecting incipient proximal caries using a digital system with storage phosphor plate (Digora®) in comparison with a conventional intraoral film (Kodak Ektaspeed Plus®). Thirty-one extracted upper premolars were selected. Of the 62 surfaces, 33 had proximal caries with discoloration or incipient lesions, and the rest showed no evidence of caries verified on strict inspection using fiber-optic transillumination. All teeth were radiographed following the paralleling technique (60 kV, 40 cm focus-to-film distance). Exposure was adjusted to Ektaspeed Plus film, while reduced to 1/2, 1/4, and 1/8 on Digora®. The films and digital images were evaluated by three observers, using a confidence rating for the presence of caries. On Digora®, the observers could control contrast and brightness. The results showed that Digora® had better performance in detecting caries than the film, even when the exposure was used for the film, although there were no statistically significant differences. The results suggest that the storage phosphor plate system may be used clinically to diagnose incipient proximal caries, while reducing the exposure to the patient.
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