What to do next? (Part III)

A 13-year-old boy has severe crowding (Fig.1-5).  Four of the first bicuspids were extracted on 02/17/2014.  Full mouth brackets or bands (except #18) were placed on 03/27/2014.  Alignment improved 2 months later (Fig.11, 05/24/2014).  The upper 18 ss wire was modified (Fig.12), and fixed with alastiks (Fig.13,14).  One month later (07/01/2014), local alignment also improved (Fig.15); the upper modification is confined to one tooth.

Four and a half months post bracketing (Fig.21-25), what do you find and what should be done next?

Prior to bracketing, the mesiodistal space for #18 is planned to be obtained by moving #20 and then #19 mesially (Fig.31-35, 16x16 ss).  The six anterior lower teeth are tied together in a figure 8 fashion.  Power chains are placed between the lower canine and the 2nd bicuspids.  The upper diastemata are to be closed by power chains between the 1st molars. What happens next?

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Xin Wei, DDS, PhD, MS 1st edition 08/14/2014, last revision 09/27/2014