Centering Ability of ProTaper Next and WaveOne Classic in J-Shape Simulated Root Canals

Figure 2

Arcs were obtained from the existing concentric circles (red lines) and from the additional ones (black lines); we also obtained the mean point of the chords subtended by each arch. A segmented straight line (yellow line), representing the mean preinstrumented axis, was therefore obtained joining together all the median points of the chords.