To correct the trajectory, Lindamann bur should be used immediately post removal of the 2 mm drill (Fig.6, as compared to Fig.1).  Substantial mesial bone should be removed (Fig.7 red slashes) so that the thickness of the mesial and distal bone is equivalent (white arrows).

Deep Placement Last Next Xin Wei, DDS, PhD, MS 1st edition 02/13/2017, last revision 12/02/2018