Fig.9,10 are coronal sections of CBCT through the distal root of the lower right and left 2nd  molars (7) of a 56-year-old Chinese lady, respectively.  The lingual concavity (<) is minimal (Type I).  With finger guidance, it is safe to place a 5.3x8 mm bone-level tapered implant (Fig.9,10).  Red dashed lines indicate the upper border of the inferior alveolar nerve (N) canal.

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