A 60-year-old man has difficulty chewing with the lower left 1st molar, which may have root fracture.  CBCT is analyzed for implant placement in the septum.  The latter is sectioned by thin blade osteotomes, as indicated by 6.9 mm green line in Fig.1 (axial section).  The sectioning creates a slot and makes it easy to start osteotomy with a 2.0 mm pilot drill and a series of reamers in the middle of the septum.  M: mesial; D: distal.  4 mm refers to the width of the septum.

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Xin Wei, DDS, PhD, MS 1st edition 03/08/2013, last revision 03/08/2014