Ridge split and bone expansion is also required at #8 (Fig.4) and 9 (Fig.8) to push (not perforate) the Incisive Canal medially (Fig.1 *).

The palatal plate at #9 is resorbed (Fig.5 ^).  Osteotomy (Fig.6 red line) or ridge split (Fig.7) starts palatally, since the labial plate is weaker than the palatal one.  The palatally-exposed implant threads will be covered with bone graft (Fig.8 red circles) and collagen dressing or plug.

Initial Osteotomy Through Stent

Xin Wei, DDS, PhD, MS 1st edition 07/15/2016, last revision 07/16/2016