After 4.5x7.3 mm drill with 3 O-rings, use 2.2x7.3 mm one with 2 O-rings.  Remove the guide to check whether the sinus floor (with perio probe) or membrane (nose blowing) perforates or not.  Also prepare Magic Sinus Lifter and PRF.

In Middle of Tube Last Next  3rd Placement

Xin Wei, DDS, PhD, MS 1st edition 02/01/2019, last revision 01/05/2021