Table 2.
Force for 1 mm displacement
| 180 mm rings | 155 mm rings | |||
|---|---|---|---|---|
| Divergence Angle | Half pins (1 ring) | Transverse Wires (2 rings) | Half pins (1 ring) | Transverse Wires (2 rings) |
| 90° | 188.1 (±3.27) | 198.8 (±1.46) | 209 (±0.35) | 195.5 (±1.63) |
| 75° | 169.19 (±1.77) | 173.46 (±2.49) | 204 (±3.18) | 184.3 (±3.51) |
| 60° | 149.77 (±1.39) | 155.66 (±2.83) | 178.8 (±2.67) | 178.8 (±1.35) |
| 45° | 129.35 (±0.78) | 124.37 (±3.71) | 164.4 (±1.93) | 150.1 (±2.47) |
All values in N and brackets show SD. There was no statistically significant difference between the half pin and transverse wires (with accessory ring) assembly (p > 0.05). However, there was a significant increase in force required to allow 1 mm movement in the smaller (155 mm) ring size (p = 0.038).