Fig.3 (palatal view): A 6x17 mm tap (T) is placed at 14 mm corresponding to the mesial gingiva.  The coronal threads of the tap are exposed palatally (<).  It is essential to place bone graft in this same area when an implant is placed.

Septum of Upper 1st Molar

Xin Wei, DDS, PhD, MS 1st edition 12/06/2014, last revision 12/06/2014