Fig.1 (CBCT sagittal section of the lower left sextant): The inferior alveolar nerve is atypical at the site of #18 of a 56-year-old lady. There is an extra superior (coronal) bulging segment.
Let us make a coronal section through the white line.
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Xin Wei, DDS, PhD, MS 1st edition 01/26/2013, last revision 01/26/2014