After incision and 1.6 mm pilot drill, a guide pin with 7 mm length is inserted to confirm trajectory and depth; it appears that 11 mm osteotomy has enough clearance from the superior border of the Inferior Alveolar Canal (IAC, Fig.2 red dashed line). In fact the lowest point of the crestal slope (distal) should be considered in term of the depth.

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Xin Wei, DDS, PhD, MS 1st edition 01/19/2017, last revision 01/01/2020