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The mean (SD) number of cycles to failure (NCF)* and fragment lengths in mm (SD) of tested NiTi instruments
| Tested NiTi instruments | NCF (SD) | Fragment length (mm) (SD) |
| ProFile (n=40) | 365.25 (75.64)c | 2.5 (0.4) |
| FlexMaster (n=40) | 376.12 (63.38)c | 2.6 (0.4) |
| Twisted File (n=40) | 483.1 (133.85)b | 2.5 (0.5) |
| Mtwo (n=40) | 556.75 (78.58)a | 2.7 (0.3) |
SD=Standard deviation;
different letters in the same column indicate statistically significant difference
