Objectives: Various studies over years have shown that Radiography is indispensable for caries detection. According to Moystad et al (1996) since introduction of bitewing technique 70yrs ago it has become most frequently used intra-oral radiographic examination in the world. The aim of this pilot study was to compare interproximal caries depth on storage phasphor plate images and conventional film. Methods: A Denoptix phosphor plate and size 3 Insight film were simultaneously placed into a bitewing Rinn holder. The Insight film was placed behind the plate. Both were simultaneously exposed to radiation. A five point scale was chosen for interproximal caries depth: sound; caries in enamel; caries in outer half of dentine; caries in inner half of dentine; caries in a restored surface. Bitewing films were evaluated by 2 clinicians. Technical errors on radiographs were evaluated using the following criteria: surface without overlapping, overlapping enamel only/enamel & dentine), missing teeth, impacted teeth. Results: There were 320 sound surfaces on the Phosphor plate compared to 300 on film. Caries in enamel was 1 on the plate compared to 7 on film. Caries in the inner half of dentine were the same in both as well as caries in a restored area. There were 288 surfaces without overlapping on the Phosphor plate compared to 277 in film. Missing teeth were the same on both. There were 5 impacted teeth on the Phosphor plate compared to 6 on film. Overlapping in enamel and dentine were 10 on Phosphor plate and 6 on film. Conclusion: There is no difference in the performance of the Phosphor plate and the Insight film for the detection of interproximal caries depth except in detecting caries in the outer half of the dentine. This could be due to the small sample size or bias of the examiners.