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With the septum being fractured, osteotomy is still initiated mesial to the remaining septum (Fig.6 red dashed line; i.e., in the mesial slope of the socket). The prospective implant has to be a little larger, since it is going to miss the distal bony support. The opening of the socket is 6x9 mm. When a 6x17 mm tapered tap is inserted at the depth of 14 mm, it is stable (Fig.7). Part of the stability must be derived from the contact of the tap with the buccal and lingual plates, in addition to the mesial plate.
Xin Wei, DDS, PhD, MS 1st edition 06/25/2015, last revision 06/25/2015