Figure 1.

Representative image of an axial slice of CBCT (on top) showing the root canal in the mesial root divided into five regions for the assessment of presence of filling voids during Task 1. Scheme of a mesial root used for examiner´s calibration (1). Visual analogue scale used to indicate the examiner´s level of confidence (2). Representative set of slices of a sample (below), showing the same tooth on micro-CT and different CBCT devices and protocols, for blind evaluation in tasks 2 and 3. CBCT, cone beam CT.