Fig.5 (intraop PA): The sectioning of the septum makes it easy for a 2 mm pilot drill (P) to penetrate the septum without sliding into either the mesial or distal socket.  Red dashed line: upper border of the inferior alveolar nerve canal.

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