Fig.8: Power chains are continuously used bilaterally between L5,6.

Again, shed light evenly into the mouth to get better image.  LL3,4 are too bright.

The posterior end of the power chain is better placed around the molar tube (Fig.6) than the hook.

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