When the 4.5x17 mm tap is removed, the osteotomy (Fig.3 O) is slightly toward the buccal aspect of the extraction socket, but it has intact wall, including the mesiobuccal (>). The apex of the ostoetomy has no bone, but there is no air leakage. The next tap, 5x17 mm, is inserted shallower (~ 8 mm in the septum; to reduce potential trauma) with stability. P: palatal socket.
Xin Wei, DDS, PhD, MS 1st edition 05/29/2013, last revision 06/22/2014