Three months post #14 implant removal and bone graft, the existing guide is reused, but no stop fixture mount cannot be inserted into #13 implant as an anchor.  After 3.5x7.3 mm drill with 12 mm offset, the bottom of the osteotomy is not so hard; therefore sinus lift is conducted with allograft and 4x10 mm dummy implant (Fig.1).  The lifted sinus floor is in fact not noted during the surgery (Fig.1 dashed red line). 

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Xin Wei, DDS, PhD, MS 1st edition 12/17/2019, last revision 03/15/2020