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Fig.5 is an illustration of a coronal section of #15 socket (at a plane shown as a blue line in Fig.4). Green line: sinus floor; red: buccal socket; yellow: palatal socket; black: septum (S).
If the septum is found wide enough after extraction, osteotomy is initiated at the septum using a pilot drill (Fig.6 D, ~ 1 mm from the sinus floor), followed by osteotomes.
Xin Wei, DDS, PhD, MS 1st edition 12/27/2014, last revision 12/27/2014