Hi,
I'm not a dentist or medical at all but since no one else has responded to your questions about HBO and ORN I wil try.

HBO is hyperbaric oyxgen treatments. I was told prior to my radiation that these HBO treatments, about 30 of them, would be an absolute necessity before I had any dental surgery after having radiation. This is the only reason that I allowed them to pull some teeth before radiation.

ORN is osteoradionecrous (sp?) which is basically the bone dying and can lead to major problems. I think you need to get a second opinion before you dive into this dental surgery without HBO.

I havent' read it, but try the dental section of this web site and see what it tells you.

Please someone else more qualified to address this, update this issue.

Thanks,
Eileen