Table 4 Reaction force and moment on the mesial end of TMA key loops and the moment/force ratio for different loading types
From: Mechanical force system of double key loop with finite element analysis
Retraction force (N) | X (N) | Z (N) | Moment (N mm) | M/F (mm) | |
|---|---|---|---|---|---|
Type-1 single | 2 | 2.00 | − 0.742 | 7.06 | 3.53 |
4 | 4.00 | − 1.483 | 14.12 | 3.53 | |
6 | 6.00 | − 2.225 | 21.18 | 3.53 | |
Type-1 | 2 | 2.00 | − 0.417 | 7.11 | 3.56 |
4 | 4.00 | − 0.835 | 14.22 | 3.56 | |
6 | 6.00 | − 1.252 | 21.33 | 3.56 | |
Type-2 | 2 | 1.98 | 0.223 | 6.48 | 3.27 |
4 | 3.96 | 0.445 | 12.97 | 3.27 | |
6 | 5.94 | 0.668 | 19.46 | 3.27 | |
Type-3 +5 | 0 | 0.00 | − 0.023 | 3.68 | – |
1 | 0.99 | − 0.064 | 5.39 | 5.44 | |
2 | 1.98 | − 0.003 | 9.14 | 4.61 | |
4 | 3.96 | 0.027 | 16.74 | 4.22 | |
6 | 5.94 | 0.086 | 24.34 | 4.10 | |
Type-3 +10 | 0 | 0.00 | − 0.479 | 8.15 | – |
1 | 0.99 | − 0.291 | 9.24 | 9.32 | |
2 | 1.98 | − 0.164 | 11.38 | 5.74 | |
4 | 3.96 | − 0.069 | 18.39 | 4.64 | |
6 | 5.94 | − 0.010 | 25.99 | 4.37 | |
Type-3 +15 | 0 | 0.00 | − 0.745 | 12.67 | – |
1 | 0.99 | − 0.557 | 13.76 | 13.88 | |
2 | 1.98 | − 0.378 | 15.02 | 7.58 | |
4 | 3.96 | − 0.167 | 20.05 | 5.06 | |
6 | 5.94 | − 0.108 | 27.66 | 4.65 |