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The mesial half of the crestal bone (Fig.5 ^) is denser than the distal half. There is a slope in the mesial crestal bone.
As soon as the deviation is noted, remove the drill/reamer/implant (Fig.6 (illustration) white area).
Xin Wei, DDS, PhD, MS 1st edition 01/14/2015, last revision 01/14/2015