The septum is in fact absent, as compared to Fig.1.   The septal bone may have been resorbed in the last 7 months.  The mesiobuccal plate is low; the osteotomy starts lingual to the center of the socket.

Fig.5 shows a 4.5x17 mm tap in place: approximately 3.5 mm in the new bone (~2.5 mm from the inferior alveolar canal).

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Xin Wei, DDS, PhD, MS 1st edition 07/29/2013, last revision 03/21/2020