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.

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Xin Wei, DDS, PhD, MS 1st edition 03/29/2015, last revision 01/02/2021