Figure 2. Renderings of three different filling materials scanned with nano-CT images (voxel size = 1.58 µm), which shows improved contrast and details on the 3D volumes of voids after the root canal treatment, in comparison with micro-CT images. The details of internal (arrowhead), external (arrows), and combined voids (stars) are clearly presented in AH Plus (a), Total Fill BC Sealer (b) and Sure Seal Root (c) in the coronal, middle and apical third, respectively.