Crimpable power hook is placed mesial to UR2 for distalization (for root torque).  If it works, remove the wire and reposition the hook for UR1 next visit.

Ortho vs. Implant Last Next  植牙，导板与正畸

Xin Wei, DDS, PhD, MS 1st edition 11/10/2020, last revision 01/10/2021