Although miniscrews can be an important adjunct in anchorage control, it is still important to understand their biomechanics.

Posterior segment movement can occur if a continuous archwire connects anterior and posterior segments. 

There are advantages to a direct pull between a temporary anchorage device (TAD) and an anterior segment during space closure and other types of segmental movement: The system is statically determinate, and the line of force is easily visualized.

For anterior retraction, a favorable intrusive force to the incisors is possible. If lever arms are not far enough apically because of anatomical limitations, compensating moments can be placed in a continuous archwire. 

These moments can lead to friction in the appliance, reduce anterior retraction, and produce total-arch movements. Miniscrews are very versatile and can be placed in many locations. 

Therefore, many novel biomechanical solutions with TADs are presented in this chapter. In addition, the possibilities of total-arch movement with miniscrews instead of segmental movement are explored. 

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