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A 2nd problem is that a 2 mm pilot drill has to be 18 mm deep to get a "bite" into the bone. The apical end of the osteotomy is close to the upper border of the Inferior Alveolar Canal (red dashed line). Yellow dashed line: the lower border of the Inferior Alveolar Canal.
Xin Wei, DDS, PhD, MS 1st edition 02/24/2015, last revision 02/24/2015