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Five months post implant removal and bone graft, incision is made at #12. Osteotomy is being done with guide until 3.0x7.3 mm drill with 1 O-ring (palatal wall being thin), followed by 3.2x17-19 mm sinus round drills and 2.2x11.5 mm drill. After placement of 2 small loads of bone graft, a 4x9 mm dummy implant is inserted for sinus lift (Fig.1*). By this time, the buccal plate is gone, while there is apparently the palatal periosteum.
Xin Wei, DDS, PhD, MS 1st edition 02/13/2020, last revision 02/13/2020