Materials and methods. In this diagnostic in-vitro study, 40 maxillary incisors were mounted in a segment of dry bone and preliminary radiographs were obtained using CCD and PSP sensors. Artificial resorption cavities were produced on the middle-third in half of the samples and on the cervical-third in the other half on the buccal root surfaces. Radiographs were repeated and images were evaluated. Data were statistically analyzed using chi-square and diagnostic tests. 

Results. There were no significant differences between the two sensors in the sensitivity (P =0.08 and 0.06) and specificity (P =0.13) for the diagnosis of resorption in both root areas. The overall accuracy of CCD was higher than PSP sensor however, the difference was not statistically significance (P >0.05). 

Conclusion. CCD and PSP sensors chosen for the present study produced similar results in diagnosing simulated external root resorption.