Fig.5 (intraop occlusal view): Osteotomy is initiated in the palatal socket with a 2 mm pilot drill, followed by 2.5 and 3.0 mm reamers and 4.5x20 mm tap.  The septum appears to have been pushed buccally (*) and form a new buccal wall (partially, strengthened by bone graft mentioned later) for the implant to be placed.

Fig.3 shows that the lingual (palatal) root is larger than the buccal one.  Here the palatal socket is much larger than the buccal one, suggesting the incomplete septum (due to root fusion) has been pushed buccally mostly by application of the tap mentioned above.

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Xin Wei, DDS, PhD, MS 1st edition 02/23/2013, last revision 03/21/2020