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The septum perforates into the distobuccal socket when 4.3 mm drill is being used. The sinus floor bone (Fig.5 *, Fig.6 red dashed line) has to be used for primary stability. Finally a 6x20 mm tap achieves stability apparently by engaging to the mesial and distal walls of the socket.
Xin Wei, DDS, PhD, MS 1st edition 02/17/2017, last revision 02/17/2017