1. Arrow clip: bent with 0.8mm steel wire. Firstly, a 0.5mm plaster model was carved in the mesial-distal gap of the first permanent molar, and then the arrow on one side, the horizontal arm and the arrow on the other side were bent, wherein the horizontal arm did not touch the buccal surface and was parallel to the occlusal surface; The two arrows make an angle of 45 degrees with the long axis of the tooth; The connector extends along the occlusal abduction space and passes through the lingual abduction space to reach the tissue surface.
2. Adjacent hook: 0.7-0.8mm steel wire, 0.5mm model is carved on the buccal surface of bicuspid teeth adjacent to gingival papilla in the cusp space, and the end of the steel wire is bent.
3. Hyperbolic lip arch: 0.7mm steel wire bending. Take a steel wire and bend it into an arc along the labial surface of the anterior teeth, which is located at the crown 1/3. Both ends of the steel wire bend vertically to the gingival side at the junction of the buccal surfaces of the canine teeth of 1/3 and 1/3, and slowly bend to the occlusal side along the occlusal abduction gap 2- 3mm below the marginal gingiva. The hyperboloid is required to be u-shaped.
4. One-arm card: the same removable denture part.
5. Hyperbolic tongue spring: made of 0.5mm steel wire. The first curve is located at the lingual cervical margin, and the horizontal arm length is equal to the proximal, distal and middle diameter of the crown. The second curve is parallel to the first curve, slightly shorter than the first curve, and it is a connector constrained at the midpoint of the first curve to bend 90 degrees with the gingival side.
6. Dial spring: 0.5mm steel wire bending. It is also better than the needle spring, but its action arm is at 180 degrees with the connector. The action arm is located in the mesial or distal neck of the moving tooth, and the force ring is located in the opposite direction of the tooth movement, and the diameter of the force ring is about 5 mm
7. Split spring: 0.9- 1.0mm steel wire bending. Diamond or w or u-shaped.
Mainly includes the above steps.