Fig.2: In order for tap drill (T: 7x17 mm) to engage into the new bone, the initial osteotomy (red outline) has to be a few mm longer. Yellow dashed line: the upper border of the inferior alveolar canal.
The septum has disappeared by this stage.
Xin Wei, DDS, PhD, MS 1st edition 10/07/2014, last revision 04/29/2019