Fig.2 (CBCT sagittal section) shows that the mesiobuccal root of #15 is curved (MB).  Extraction may be difficult.  Apical lesion is extensive.  A 5x10 mm implant is planned to be placed in the septum if possible.

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Xin Wei, DDS, PhD, MS 1st edition 02/15/2013, last revision 02/16/2014