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After sectioning the FPD as indicated by black dashed line in Fig.2, try to initiate osteotomy at #3 with 1.2 and 1.5 mm drills for 5 mm (bone height) and 1.0 and 1.5 mm Tatum micro-osteotomes for sinus lift and place a 2x8.5 mm IS mini-implant. If it is feasible, place a 4x14 mm tissue-level implant slightly mesial at #4. If not, place a larger one (4.5 mm) slightly distal for a cantilever FPD.
Xin Wei, DDS, PhD, MS 1st edition 02/08/2020, last revision 02/09/2020