HERO Shaper Profile Twisted file Apical region 70.56 73.79 5.85 Middle region -7.88 3.65 -91.23 Coronal region 3.82 -11.20 5.96

Table 6: Centering ability of instruments (σΔx – σΔy) by region. Positive value indicates transportation to the outer wall; negative value indicates transportation to the inner wall; zero value indicates perfectly centered preparation.