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A 4.5x17 mm tap is inserted 8 mm deep with binding to the septum. PA is taken (Fig.2). It appears that the sinus floor (black >) has been penetrated (in fact the septum height is ~5 mm), but the osteotomy has not reached the apex (white >) of the palatal (P) socket. Then the tap is advanced ~ another 3 mm.
MB: mesiobuccal; DB: distobuccal socket.
Xin Wei, DDS, PhD, MS 1st edition 05/29/2013, last revision 06/22/2014