Retrieval of fractured roots is extremely difficult due to hard bone. Hemorrhage seems to be inconsistent with osteonecrosis. The bone is so hard that the 2 mm drill does not reach the predetermined depth (15 mm vs. 13 mm (Fig.2)). What is ignored is the mesial deviation of the initial osteotomy (<). Red dashed line: the superior border of the Inferior Alveolar Canal.
Xin Wei, DDS, PhD, MS 1st edition 05/31/2018, last revision 06/22/2018