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The centering ratios of the two systems at different levels from the apex
| Distance from apex | 1 mm | 3 mm | 7 mm | P -value |
|---|---|---|---|---|
| System/Centering ratio | Mean (SD) | Mean (SD) | Mean (SD) | |
| SafeSider | 0.24 (0.14) | 0.41 (0.16) | 0.58 (0.17) | P<0.001 |
| ProTaper | 0.73 (0.14) | 0.83 (0.05) | 0.91 (0.47) | P<0.001 |
| P -value | P=0.000 | P=0.000 | P<0.001 | - |
