- used for mesiodistal tooth movement.
- Active arm is 12 mm and retentive tag is 3-5mm.
- Placed along long axis of the tooth which has to be moved.
- If tooth is to be moved mesially, direction of helix will be distal
- The finger spring is activated by moving the active arm towards the teeth intended to be moved. This is done as close to the coil as possible.
- Activation of upto 3 mm is considered
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