Fig. 2
From: Shaping ability of protaper next compared with waveone in late-model three-dimensional printed teeth
Images comparing the original premolar to a 3D-printed replica tooth. (a) (b) (c) Images of the root canal of a premolar, showing the pre-preparation canals in blue and the post-preparation areas in red. (c) The untouched areas are presented after overlapping (a) and (b). Pre-preparation, post-preparation and overlapping root canal images for the 3D-printed tooth are shown in yellow (d), green (e), and (f), respectively. (g) and (h) show overlapping canal images for the real premolar and the 3D-printed tooth before and after preparation, respectively