Efficacy of Trophy RVG UI Sensor in Detecting Interproximal Caries

Objectives: The purpose of this study was to compare the efficacy of the Trophy RVG UI sensor (Trex-trophy Radiology Inc, Marietta) and Kodak Insight film (Eastman Kodak Co, Rochester, NY) in detecting proximal caries. Methods: Two acquisition modes (high-resolution caries mode and high-sensitivity caries mode) were used in this study. Twenty-two extracted human upper premolars were selected. Of forty-one surfaces, twelve had caries lesions with small cavity, and the rest showed no evidence of caries verified by the strict inspection using a fibre-optic-transillumination. All teeth were radiographed by following the paralleling technique (60kV, 40 cm focus to sensor distance). Exposure was set at 0.08 sec for high-resolution caries mode, 0.12 sec for high-sensitivity caries mode and 0.16 sec for Kodak Insight film. Images were evaluated by three observers. For digital images, the contrast and brightness was allow to use. Possible differences in ROC curve areas among image modalities were assessed by ANOVA. Results: Mean ROC curve areas were 0.64, SD:0.04 for high-resolution caries mode, mean 0.55, SD: 0.12; for high-sensitivity caries mode and 0.69, SD: 0.14; for Kodak Insight film respectively. There are no statistical significant between each modalities. Conclusion: This study suggest that RVG caries mode is an alternative to intraoral film in assessing the incipient caries lesion.