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After sinus floor breakdown (use of sinus drill for 16 mm) and use of membrane lifter/water, two pieces of PRF membrane are inserted. The membrane is so slippery that it is easy to enter the sinus for further sinus membrane lift and later allograft placement (Fig.4 *). A 4.5x10 mm dummy implant is placed with high torque after 4x7.3 mm drill with 3 mm stopper so that 4.5x7.3 mm drill with 1 mm stopper is used before placement of a 5x8.5 mm final implant with ~ 35 Ncm (Fig.5-7). When the dummy implant is removed, more of allograft is inserted to fill the gap distal to the dummy implant.
Xin Wei, DDS, PhD, MS 1st edition 07/26/2019, last revision 07/26/2019