Power chains are placed between the mesiolingual mini-implant and #14 buccal tube until the appointment for crown prep.  In this way, the lingual cusps may ascend (Fig.13 red arrow), while the buccal ones may descend (black arrow).  The occlusal clearance will be more favorable.

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Xin Wei, DDS, PhD, MS 1st edition 08/26/2014, last revision 08/27/2014