Since the apical native bone is limited at #13 after extraction, no PA is taken until a 4x11 mm dummy implant is placed after 1.6 mm and 3.3 mm drills for 13 mm (Fig.1).  The trajectory needs to be changed. First, the implant is removed (Fig1').

Change in Trajectory Last Next Xin Wei, DDS, PhD, MS 1st edition 08/31/2017, last revision 10/10/2019