Fig.3,4 are coronal sections of CBCT through the mesial root of the lower left 1st molar (6) and the distal root of the 2nd  molar (7), respectively.  The lingual concavity (<) is more pronounced in the 2nd molar than that of the 1st one.  B: buccal; L: lingual.  The lingual crest is higher than the buccal one (compare arrowheads in Fig.3).

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Xin Wei, DDS, PhD, MS 1st edition 04/14/2013, last revision 04/15/2014