Anterior retraction movements which can be predicted,
simulated or even mainpulated by different lengths of
power arm in sliding
mechanics force system.
Sheau Soon Sia, Tatsunori Shibazaki, Yoshiyuki Koga,
Noriaki Yoshida Biological mechanisms of Tooth
Eruption, Resorption and Movement Speedy, accurate
and controllable anterior teeth retraction by an
improved method :
a sliding mechanics force system with power arms
p 297-303, 2006