UR1 moves mesial 20 days post open coil spring (Fig.7 arrow), while UL1 debracketes after permanent re-cementation of the temporary crown last visit (*, no re-bracketing, since it appears not essential). Before placement of 20 ss wire, diastemata are created by proximal reduction (Fig.8 *).
Xin Wei, DDS, PhD, MS 1st edition 10/31/2018, last revision 12/05/2018