Fig.6: Power chain x2 are placed between L5 and 6 to correct the rotation of the former in timely manner.

Posteriorly, the power chain is better placed on molar tube (instead of the posteriorly bent hook) to the best mechanical advantage (straight line).

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Xin Wei, DDS, PhD, MS 1st edition 08/24/2013, last revision 08/25/2013