Fig.1 is a coronal section of CBCT through the distal root of the lower right 2nd molar (7).  The patient is a 41-year-old Chinese male.  The apex of the 2nd molar (yellow dashed line) is closer to the lingual concavity (<) than to the inferior alveolar nerve canal (N).  B: buccal; L: lingual.

Fig.5 is an illustration, showing the socket after extraction (from Fig.1).  The red circle in Fig.5 represents the lingual artery, which is the 2nd branch from the external carotid artery.

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Xin Wei, DDS, PhD, MS 1st edition 04/14/2013, last revision 04/14/2014