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UR1-UL3 seem to have shifted to the edentulous area preop (Fig.6). The shifting is fixed as the edentulous space increases (Fig.6'). The diastema between the centrals is easy to relapse during treatment. A fixed retainer appears to be needed (Fig.6'). In fact it is fabricated prior to debanding (Fig.6").
Xin Wei, DDS, PhD, MS 1st edition 10/20/2019, last revision 10/20/2019