Power arms are simple appliances that are easy to use, and
are generally used for canine retraction and anterior diastema
closure. The movement applied by the power arms
is going to be determined by its length and root measurements.
The biomechanics consists in getting these arms as
close as possible to the center of resistance so that rapid and
stable space closure takes place (bodily movement).
They are made by tackle welding a "C" form rectangular
arch (on the gingival aspect) over a direct bond button.
They are bonded on the gingival area of the dental crown
and the force is applied through a power chain, an open
coil or a 6 ounce elastic