Fig.6 is an illustration after extraction (S: septum; M: mesial socket).  Osteotomy is initiated with a pilot drill in the distal aspect of the mesial socket or the mesial aspect of the septum (Fig.7 red line).

Distal Resorption

Xin Wei, DDS, PhD, MS 1st edition 03/21/2015, last revision 03/21/2015