When the residual root of #29 is removed, the apical distal wall is too painful to be debrided.  Intraop PA shows a perforation (Fig.2 between arrowheads) between the bicuspid and the 1st molar.  There is large radiolucency around the mesial root of the molar.

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Xin Wei, DDS, PhD, MS 1st edition 07/30/2013, last revision 01/19/2018