Labial inclination of lingually inclined molars or molar rotation
Description:
Lingually inclined teeth are gradually set upright with this screw
The screw consists of a base plate and a pan lever on which a small movable pan plate is fixed. The pan lever is connected to a hinge joint with a spring for a firm adjustment. The small pan plate has to be adjusted on the tooth to be moved and has to be covered with wax together with the hinge joint, the spring and the activation screw.
If the inclination of the tooth is severe, the point of application of the pan plate does not have to lie under the biggest circumference of the tooth in order to avoid interferences when inserting the appliance. In combination with a labial spring, the lever pan screw can also be used to rotate a molar.
The activation screw changes the position of the pan lever and moves the distal part of the molar labially. A labial spring which can be soldered on the Adams clasp serves as counterpart for the rotation and exerts pressure towards lingual on the mesial part of the molar. This force couple results in a rotational movement of the molar.
