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To solve the diastema between UR3 and 4 (Fig.1), the bracket at UR3 is placed in the height of contour (Fig.1 insert, Fig.4). Arch wire sequence may automatically close the diastema (Fig.1 insert arrows).
Xin Wei, DDS, PhD, MS 1st edition 06/08/2020, last revision 06/08/2020