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The UL 3 is mesial to the space between LL 3 and 4 (Fig.5: 4.5 months post bracketing, 16x16 ss wires just placed). Distal retraction of UL 3 is necessary, while UL5 needs to be retracted mesially. Power chain is expected between them.
Xin Wei, DDS, PhD, MS 1st edition 07/29/2015, last revision 07/29/2015