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After extraction, a 2 mm pilot drill is placed 17 mm from the gingival margin, it looks close to IAC (Fig.4 yellow dashed line; red dashed line: mental loop; pink line: root apices). At the time of surgery, it felt maybe alright if the depth is controlled tightly for further osteotomy. Taking intraop PA is not an easy task even with sensor 1 because of small mouth and floor mouth sensitivity to the sensor. Several exposure has to be done for every step. This is a warning sign. Retrospectively, the osteotomy should be confined to the apex of the socket (pink).
Xin Wei, DDS, PhD, MS 1st edition 11/22/2014, last revision 03/28/2015