A vertical root fracture is noted in the mesial root (Fig.4: lingual view), consistent with the gutta percha pointing to the mesial root (Fig.3).  The post in the mesial root is the culprit.

Fig.12 is taken after soaking .2 % of Hypochlorite solution (mesiolingual view).

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Xin Wei, DDS, PhD, MS 1st edition 07/29/2013, last revision 05/19/2020