The lower 4s are expected to be extracted.  On the day of surgery, LR 5 is found to have been heavily restored (MO amalgam, DO composite, Fig.1); the prognosis is less favorable than LR 4.  So the former is extracted (Fig.2).  On the other side, the canine area is crowded (Fig.1: 3).  Therefore the lower left 1st bicuspid is extracted (Fig.2).  Fig.2 is taken on the day of banding (2 weeks post extraction).  A Niti wire (.014") is used.  According to model surgery, the anterior teeth are to be distalized (Fig.2 arrows).

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Xin Wei, DDS, PhD, MS 1st edition 03/29/2015, last revision 01/02/2021