You had mentioned at one point that you were located between Richmond and Norfolk. Perhaps the head/neck cancer clinics at Virginia Commonwealth University (formerly Medical College of Virginia) and Eastern Virginia Medical School have names of dentists who are experienced with patients who have had radiation.

You could also use Kelly's suggestion by seeking recommendations from oral surgeons affiliated with those facilities.

I see that the UVa head/neck cancer team includes a dentist. His office may know of other dentists closer to you.

Have you tried checking with our own Jerry Wilck (wilckdds)? I know he's in Pennsylvania (and he's retired, lucky guy!) but perhaps he knows of a listserv or other group for dentists who are familiar with the issues that arise in such patients.