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Mean values of Torque (N.cm) at bending moment of the tested instruments
| Instruments | Bending moment (N.cm) | |
| Mean | SD | |
| ETP 25.06 | 1.25a | 0.07 |
| PT 25.08 | 1.18a | 0.08 |
| PTG 25.08 | 1.43b | 0.09 |
| FG 25.08 | 1.63c | 0.08 |
SD: Standard deviation. Different superscript letters in the same column indicate statistical differences among groups (P<0.05)
