Dx and Internal Root Resorption

Diagnosis and Internal Root Resorption: Interesting case presented here. This tooth is non-vital and infected. However, prior to getting to this state there was a process of internal root resorption (green arrow) which can only have happened while the tooth was alive (live tissue is required for this process to happen). Additionally, there is significant bone loss evident in the furcation area. This is NOT caused from the resorption defect; rather likely from an infected accessory canal! Pretty interesting because there are multiple things going on with this tooth.