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Kruskal-Wallis test showed no statistically significant differences in the middle third (p > 0.05).
| Step-Back | ProTaper Universal | ProTaper Next | Wave One | |
|---|---|---|---|---|
| Step-Back | 0.3278 | 0.5059 | 0.9012 | |
| ProTaper Universal | 0.6548 | 0.2675 | ||
| ProTaper Next | 0.4426 | |||
| Wave one |
