The initial depth at #5 is 6 mm, bone expander 1 at 7 mm, expanders 2, 3 at 8 mm.  Then place bone graft for sinus lift, pushed with the last expander (Fig.1,2).

Similarly, initial drill will be at 12 mm, expander 1 at 13 mm, 2,3 at 14 mm in order to elevate the sinus floor distal to the osteotomy (Fig.1,3). 

Initial Osteotomy Through Stent

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