Fig. 3
From: Shaping ability of protaper next compared with waveone in late-model three-dimensional printed teeth
The different directions of the overlapping images of the S-shaped root canals. The coronal curvatures of the pre- and post-preparation canals are shown in green and red, respectively. The pre- and post-preparation apical regions are shown in blue and yellow, respectively. Column a shows images of the prepared root canals, and images of the post-preparation canals are shown in column b. In column c, the untouched areas are presented after overlapping the images in the a and b columns. Finally, column d shows the sections of the overlapping canals