The root appears to fracture (Fig.2 <), as related to the post (P) and large periapical radiolucency (*).  A 4x13 mm implant will be placed (Fig.3).  Sticky bone will be inserted while the last drill is in place. 

Root Fracture     Last     Next

Xin Wei, DDS, PhD, MS 1st edition 07/06/2020, last revision 07/06/2020