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Diastema appears between LR2 and 3 (Fig.7) 2.5 months post banding, while open coil spring is placed between LL1 and 3 (Fig.8). Due to tension between LR 6 and 7 while insertion of 18 SS wire (saved), the lower 16 niti wire is reused whereas the upper wire is changed to 18 ss (Fig.7,8). Two rules are violated in this case. Stiffer wire (18 ss) should be used while placing open coil spring. Ligature wire has to be used to engage an open coil spring (Fig.8: 1). The advantage of using softer wire is easy engagement to LL2 bracket when the space is created. Using alastik in LL3 is convenient. In the next few appointemtns, we will detect any adverse effects of rule violation.
Xin Wei, DDS, PhD, MS 1st edition 12/21/2016, last revision 12/21/2016