Endodontic diagnosis for tooth #27: previously treated, symptomatic apical periodontitis.  I/O examination reveals a wide, 6-8mm clinical attachment loss (i.e. probing defect) distal to tooth #27 and loss of distal contact due to enamel fracture.  A CBCT scan shows intact buccal and palatal bone and a significantly shortened palatal root due to external inflammatory root resorption.

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