After placement of a 5x12 mm implant and a 6.8x4(2) mm abutment (Fig.4), there is no occlusal clearance, while there is space between the implant and the superior border of the Inferior Alveolar Canal (red dashed line).  With removal of the abutment, the implant is placed deeper (~ 1 mm) until the buccal thread is buried subcrestally. 

Implant Position

Xin Wei, DDS, PhD, MS 1st edition 12/24/2015, last revision 01/19/2018