Fig.4 (CBCT axial section) shows that a 4.5x10 mm implant is planned to be placed in the septum between the mesiobuccal (MB), distobuccal (DB) and palatal (P) roots.  Drill/reamers are used alternatively with osteotomes to expand the septum.

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Xin Wei, DDS, PhD, MS 1st edition 02/15/2013, last revision 02/16/2014