Table 2 Results of the 5000 cycles tests for both screws
2.5 mm pitch | 5 mm pitch | p | |
|---|---|---|---|
Number of valid samples | 9 | 6 | |
Maximum insertion torque (N m) | 2.01 ± 0.45 | 1.40 ± 0.33 | |
Stiffness at 500th cycle (N/mm) | 270.1 ± 55.7 | 261.0 ± 69.6 | .906 |
Stiffness at 5000th cycle (N/mm) | 281.3 ± 66.4 | 286.1 ± 79.4 | .814 |
Displacement at 500th cycle (mm) | 1.56 ± 0.78 | 1.84 ± 1.20 | .814 |
Displacement at 5000th cycle (mm) | 11.95 ± 14.11 | 6.97 ± 5.74 | .724 |
Yield load (N) | 476.4 ± 65.3 | 494.3 ± 39.2 | .391 |
Pull-out stiffness (N/mm) | 259.9 ± 53.4 | 236.5 ± 48.6 | .886 |
Ultimate failure load (N) | 586.8 ± 44.9 | 619.1 ± 127.6 | .568 |