There is a piece of radiopaque material in the mesial aspect at the site of #18 (Fig.3,4 arrow).  After osteotomy and before implant placement, remove the guide to check whether it is dense bone or residual root.  Prepare root tip picks.

Radiopaque Last Next

Xin Wei, DDS, PhD, MS 1st edition 11/17/2018, last revision 11/22/2018