Fig. 4

Three-dimensional visualization of tooth sample 045. This tooth is interesting as it features a 1–2-2/2 root canal configuration as defined by Briseño et al. [17]. The extracted root canal is shown in red, the tooth itself is shown semitransparent. The four slices which were automatically extracted based on the enamel-dentin border are also visualized semitransparent in their correct 3D position. The whole tooth has a length of 2.39 cm. A video of the 3D visualization is found in Additional file 1 of this manuscript