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The initial and salvage pull-out force of screws 6.5×40 mm 
| Group | Type | Initial Fmax, N(SD) | Salvage Fmax, N(SD) | BMD, g/cm2 | Decrease |
|---|---|---|---|---|---|
| C1 | CDH | 2 563±923.5 | 431±229.6 | 1.884±0.171 | 83.1% |
| C2 | USS | 1 549±509.5 | 329±168.8 | 1.605±0.208 | 79.8% |
| C3 | Tenor | 2 702±609.6 | 538±198.9 | 1.583±0.137 | 80.1% |
| C4 | EPS | 960±559.3 | 1.731±0.212 |
