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After placement of .018' ss wires, power chains are placed between UR3-UL2 (Fig.5 ^) to close the diastema between UL 1 and 2 (Fig.4). An elastic is placed to close the open bite between UL 4,5 and LL 3,4 (Fig.5).
Xin Wei, DDS, PhD, MS 1st edition 05/27/2016, last revision 05/27/2016