A series of tapered osteotomes (2-5 mm) are used to create osteotomy in the base bone at the site of the tooth #2 (gaining 4 mm into new bone), followed by 4.5x20 mm tap at the depth of 17 mm from the gingival margin (Fig.2).  Arrowheads: sinus floor.

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Xin Wei, DDS, PhD, MS 1st edition 03/30/2013, last revision 12/09/2018