They say it takes 50Gy and above to kill SCC, but your right, higher is really needed, and went on to get more opinions when two centers only offered 50Gy for my recuurence, which is often the case, 50Gy, 25 sessions, but I had boost doses of IORT too at another CCC, which RO said 50Gy wouldn't work, so my total dosage was way beyond that. Certain primary areas need more like 66-70Gy, and other specific areas usually less, depending on many factors, including toxicity level limits. It's also more the mandible, than the Maxilla at risk for ORN, 60/30, those that had brachytherapy, used biphosantates, besides having had extractions, and depending on radiation dosages, areas. We probably see more ORN in oral vs oropharyngeal radiated cancers. This is just a discussion, nothing in front of me with stats, but my recollection. I posted a while back an article on ORN.