The subsequent osteotomy depth is 5 mm until 4.0 mm in diameter.  When the 4.5 mm tap is inserted with initial stability, the shortest implant (8.5 mm, Fig.8 green line) will be partially protruded into the sinus and partially exposed in the socket and the cuff of the abutment is expected to be around 6 mm (pink line).  Since the 5 mm tap achieves primary stability, a 5x8.5 mm implant (following placement of Osteogen plug to repair the perforated sinus membrane) is placed at the level just mentioned (Fig.9).

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Xin Wei, DDS, PhD, MS 1st edition 03/05/2018, last revision 07/23/2018