Osteotomy at #3 is performed last (Fig.1,2); as planned, a 4 mm cortical tap is used with guide for sinus lift.  Unfortunately the sinus membrane is perforated.  Implant placement is aborted.  Instead Osteogen plug is inserted into the osteotomy, which is fixed in place by acrylic extending from the provisional at #4.  Osteotomy for #3 implant will be attempted with control of the depth in 4 months.

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Xin Wei, DDS, PhD, MS 1st edition 03/05/2019, last revision 03/05/2019