Tammy,
I hate to jump in with both feet, but I'm goin too. I have a few questions for you if you could humor me.
Why were you told to have all your teeth extracted? Who told you to do this? Are your teeth sore, loose, or decayed? Do you have gum disease (periodontal) disease? Have you been a regular attender to a dentist in recent years?
My experience has been that Oncologists recommend that patients have a comprehensive dental examination prior to chemo/radiation treatments. I extract hopless teeth as I would in any individual and then restore the others. I then formulate an individual maintenance plan that is designed to spare as many teeth as possible. I see some patients weekly during chemo/radiation. It is rare that I have to extract all reamaining teeth prior to chemo/radiation.
To answer your questions;
Temporary dentures with/without obturators can be placed immediatly after surgery by a skilled, knowledgeable prosthodontist or dentist. These can be replaced by permanent prosthesis later on (usually within three months of surgery.)
I would suggest that you get an opinion from a prosthodontist prior to consenting to extraction of any teeth to be certain that you have been given all the possibilities.

Gary, a moderator and knowledgeable OC "guru" was told to have some teeth removed. After a few opinions he opted not too and now is enjoying the use of his own teeth which were suggested should be extracted. In some cases it has to be, but please get a few opinions before you make the decision.

I hate to put you on the spot Gary, but i you can offer any advice or wisdom here I'm sure it would be welcome. Jerry I would like your opinion on this as well, if you have anything to offer. As always, I as well learn from you.

Tammy, e-mail or PM any question to me if you would like.
My thoughts and prayers are with you in your journey.

Mike