Dentomaxillofacial Radiology, Vol 25, Issue 4 202-206, Copyright © 1996 by British Institute of Radiology

ARTICLES

Detection of approximal caries with a storage phosphor system. A comparison of enhanced digital images with dental X-ray film

A. Moystad, D. B. Svanaes, S. Risnes, T. A. Larheim and H. G. Grondahl
Department of Oral Radiology, Faculty of Dentistry, University of Oslo, Norway.

OBJECTIVES: To compare the accuracy of approximal caries detection using enhanced and unenhanced storage phosphor images and dental X-ray film. METHODS: Fifty premolar/molar teeth were exposed simultaneously under standardized conditions on storage phosphor (SP) image plates (Digora) and Ektaspeed film. The image files were transferred to a different platform for image processing. Using a five-point confidence scale, ten observers rated 95 approximal surfaces for caries in enamel and dentin with three image modalities: enhanced and unenhanced SP images and film. The observations were validated microscopically. Diagnostic accuracy was measured as the area beneath the ROC curve (Az). RESULTS: Enhanced SP images had significantly higher Az values in both enamel (Az = 0.819) and dentin (Az = 0.845) than unenhanced images and film. No significant differences were found in either enamel or dentin between unenhanced SP images (Az = 0.780 and Az = 0.789) and film (Az = 0.688 and Az = 0.793). CONCLUSION: Enhancement of storage phosphor images improved detection of approximal caries in this in vitro study compared with unenhanced images and Ektaspeed film.

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