Table 1. Degree of straightening by the three systems.
| Protaper Revo-S (n = 27) | Revo-S (n = 27) | Hero Shaper (n = 27) | |
| Mean | 4.07 ± 2.53 | 3.22 ± 2.38 | 2.81 ± 1.14 |
| P-value | 0.226 |
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