According to the American Association of Endodontists (AAE) Case Difficulty Assessment Form, what is the complexity rating for root canal treatment of a tooth with internal root resorption?

The AAE Case Difficulty Assessment Form classifies root canal treatment cases as routine (straightforward), moderate, or complex (high). Internal root resorption is classified as a moderate complexity case because it alters the normal canal anatomy, requires specialized understanding of the pathological process, and may require obturation techniques that adapt to the irregular resorptive defect (often with warm vertical condensation or MTA). It is not a routine case but typically does not require a specialist referral unless the resorption is extensive, perforation has occurred, or the case presents additional complicating factors.