Fig.1 (CBCT coronal section; B: buccal; L: lingual): A 6x11 mm implant can be safely placed at the site of the tooth #30.  Arrow (-->): the upper border of the inferior alveolar nerve (IAN) canal; arrowhead (<): radiolucency appears to be superior extension of the IAN.  This may account for why a longer implant is placed clinically (6x14 mm).  The superior extension may not be noticeable in 2 D image.

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Xin Wei, DDS, PhD, MS 1st edition 04/01/2013, last revision 12/16/2018