An open coil spring is used when the wire changes to 18 ss (Fig.5,6).  Composite is placed to have clearance for UL7 to be distalized (Fig.5 *).  To have the best anchor involving the implant at UL2, ligature wire is used between UL2-5 (Fig.6), although the arch wire is not fully engaged.

Prevent Debracketing Last Next Xin Wei, DDS, PhD, MS 1st edition 06/15/2018, last revision 12/13/2018