After extraction, osteotomy is established in the septum with 1.6 mm drill (Fig. 7 CBCT axial section (red circle)). In fact the MB plate is intact clinically. The osteotomy perforates into the distobuccal (DB) socket when 2.8 mm Magic Drill (MD, Fig.8) is used.
Xin Wei, DDS, PhD, MS 1st edition 05/24/2017, last revision 11/25/2018