Fig.2: After initial bone expansion until RT 2 mm, two-mm pilot drills are inserted at the sites of #3 and 5.  The sinus floor is perforated at #3.  The osteotomy for #3 is then moved mesially ~ 2 mm using osteotomes (RT 2-4mm). 

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Xin Wei, DDS, PhD, MS 1st edition 04/21/2013, last revision 04/21/2013