High resolution charge-coupled device sensor vs. medium resolution photostimulable phosphor plate digital receptors for detection of root fractures in vitro

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The aim of this study was to compare the diagnostic accuracy of a high resolution charge-coupled device (CCD) sensor and a medium resolution photostimulable phosphor (PSP) plate for detecting experimentally induced root fractures and further, to evaluate differences between images taken with various horizontal and vertical angles. Forty-seven extracted single-rooted human teeth mounted in a dry human skull were used in the experiment. The teeth were radiographed, before and after root fractures were induced, with two digital receptors: the Digora® PSP system (approx. 8 lp mm−1) and the RVG-ui™, a CCD sensor with a high-resolution mode (15–20 lp mm−1). Four images were taken with each of the receptors of each tooth: one orthogonal exposure (O-images), one exposure with a vertical angle of 15° by which the root was imaged elongated (L-images), and two eccentric exposures with a horizontal angle of 15° mesially and distally. Three observers marked a fracture line if detected, in each image. Three sessions were held, one assessing the O-images, one the L-images, and one in which all four images of the same tooth were displayed simultaneously (X-images). The RVG-ui™ images obtained higher sensitivities than the Digora® PSP images (P < 0.05). Sensitivity was statistically significantly higher for the X-images than for both the O-images and the L-images (P < 0.05). Based on the observed means, specificities were significantly different neither between the angles, nor between the images from the two digital systems taken with the same angle (P > 0.05). It may be speculated that the difference in spatial resolution between the two digital systems accounts for the differences in their sensitivity.

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