This is the same cat as seen in the previous post. Tooth 307 has both type I (mesial root) and type II tooth resorption. The distal root is replaced by bone and there are no endodontic changes. Therefore crown amputation is possible. The mesial root however is surrounded by a distinct periodontal ligament space and must be extracted.
Nice, good case to differentiate how each root should be treated distinctly based on Periodontal ligament and resorption