At #15, the sinus floor is initially perforated with modified drill sequence.  With placement of PRF and bone graft in the osteotomy and the sinus, the same 4.5x11 mm dummy implant is inserted to start sinus lift (Fig.4 *).  DB: distobuccal socket; *: distobuccal defect at #2.  No sinus lift is done priot to insertion of the dummy implant at #2.

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Xin Wei, DDS, PhD, MS 1st edition 02/07/2020, last revision 06/02/2020