Fig.6: A 2 mm pilot drill is 13 mm from the gingival margin.  The upper end is in the middle of the edentulous area, which is good.  The lower end is slightly deviated to the mesial socket, which is not so bad.  But at the time of surgery, the entrance point is to be changed with change in the trajectory.

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Xin Wei, DDS, PhD, MS 1st edition 10/05/2014, last revision 06/01/2018