Fig.1 (preop PA): The tooth #30 of a 64-year-old man has endo failure with large radiolucency in the mesial socket (M).  The tooth is nonsalvageable.  The mesial lesion is closer to the inferior alveolar nerve (I) than the distal apex.  In addition, there is a connection (arrowheads) between the mesial lesion and the nerve.  What is the connection, as related to extraction and immediate implant?

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Xin Wei, DDS, PhD, MS 1st edition 06/15/2014, last revision 09/30/2014