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Four months post bracketing, two of 8 mm Ancor Mini-implants are placed at the sites of the upper 2nd molars and power chain of 3 placed between the 1st molars and the mini-implants (Fig.6,8). Niti Closing Springs (12 mm and 9 mm) are placed between LR4 and 7 and LL 3 and 6, respectively (Fig.7,9, 16x16 ss wires). The forces are 100 and 150 mg, respectively.
Xin Wei, DDS, PhD, MS 1st edition 03/29/2015, last revision 01/02/2021