Fig.44 (upper occlusal view, 5.5 month post bracketing, 16x22 ss).  The space between UL 3 and 5 has been closed, whereas the one between UR 3 and 5 has not.  UR3 to UL5 are tightened as one unit to pull UR5 mesially.

UR5 may rotate while it is being pushed mesially.  We may see the effect next visit.

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Xin Wei, DDS, PhD, MS 1st edition 09/27/2014, last revision 09/27/2014