Table 5 Comparison between placement torque and removal torque according to placement torque range and placement method, and comparison of overall torque values between the self-drilling and pre-drilling methods
From: Long-term evaluation of factors affecting removal torque of microimplants
Placement torque range | Self-drilling (N cm) | Pre-drilling (N cm) | ||||||
|---|---|---|---|---|---|---|---|---|
Placement torque | Removal torque | Torque ratio | n | Placement torque | Removal torque | Torque ratio | n | |
Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | |||||
0–5 N cm | 3.07 ± 1.21* | 3.49 ± 1.97 | 1.14 | 187 | 3.64 ± 0.96* | 4.53 ± 2.98 | 1.24 | 54 |
5–10 N cm | 7.17 ± 1.39** | 3.66 ± 1.96 | 0.51 | 216 | 7.29 ± 1.47** | 4.88 ± 2.65 | 0.66 | 79 |
10–15 N cm | 11.83 ± 1.27** | 4.04 ± 2.19 | 0.34 | 66 | 11.86 ± 1.44** | 5.04 ± 2.63 | 0.42 | 58 |
Total | 6.19 ± 3.24† | 3.64 ± 2.00† | 0.59 | 469 | 7.64 ± 3.43 | 4.83 ± 2.73 | 0.63 | 191 |