Table 1. Fracture strength (Newton) of mesiobuccal root in studied groups.
| Group | N | Min. | Max. | Mean±SD |
| Manual | 15 | 31.5 | 108.5 | 50.33±19.01 |
| Rotary | 15 | 35 | 113.5 | 63.1±25.46 |
| Control | 2 | 114.5 | 121.5 | 118±4.94 |
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