Following extraction of UR C, one-fourth inch elastic is placed between UR3 and LR3,4 (Fig.5). The patient is instructed to wear the elastics 24 hours per day.  The upper wire is .018 ss with open coil springs, while lower .020.

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Xin Wei, DDS, PhD, MS 1st edition 03/23/2013, last revision 03/23/2014