Fig.4: Either 1.5 mm pilot drill or 2 mm RT is used to start osteotomy in the septum at the depth of 17 mm (white outline).  The mandible has tougher bone than the maxilla.  Drills are more likely to be used in the lower jaw.

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Xin Wei, DDS, PhD, MS 1st edition 09/22/2013, last revision 09/22/2013