You are both right if the bone was radiated it is not a good match (or at least a 30% failure risk) for implants. But not everyone has the sequence that you are referring to. Some have a resection that removes the section of mandible, have it replaced with new bone, and the resection cuts all the way to an area that is cancer free (hence no need for radiation). Radiation is used for surrounding area, neck etc, and the graft is out of the field.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.