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Orthodontic treatment includes extraction of U4s and placement of 2 mini-implants between U5 and 6 (Fig.5 o) when arch wires change to 18x25. Power arms (as high as possible) are placed between U2 and 3. U1-3s are retracted at the same time (en mass) because of absolute anchorage of the mini-implants. Retraction time will be reduced. Interproximal reduction (IPR) will be done especially at LR3 (macrodontia) if the lower arch turns out to be too large.
Xin Wei, DDS, PhD, MS 1st edition 11/09/2016, last revision 11/09/2016