Oral Cancer and Dental Implants

Dr. Lee asks:

I have a patient who is an oral cancer survivor. Five years after radiation treatment he has zero saliva and severe and extensive root caries. All teeth are hopeless and he will need full mouth extraction.

The patient wants dental implants. He will be starting hyperbaric oxygen treatment. What are his risks if we attempt dental implant placement at this time? I could not find literature
that presented controlled studies with or without hyperbaric oxygen and
success rates following implant placement.

My question is should we wait until hyperbaric oxygen treatments are
complete to place dental implants? Can we place implants during treatment? How
do I treatment plan this case?