Limited opening and impressions

I have had over 25 oral surgeries, including cancer 4 times. I have
thick bands of scar tissue that reduces how far my mouth will open. I
have lost some soft and hard pallette, portions of my upper jaw, all
upper teeth and had nearly all my gums excised and grown back multiple
times. I had a scar release surgery in 2004. I am very
surgery/anesthesic phobic...no terror. I saw (supposedly) the best
person in my city for a dental prosthetic today. He said that I need
more surgery to release scar tissue so he can get an impression. The
device that holds the impression material won't fit into my mouth. I
have no upper teeth and the individual that was supposed to be my best
chance said he can't help me. Surely there is some way to get an
impression of my upper jaw (what remains of it) without more surgery.
Why can't modern dentistry (with so many new advances) find a way to
get an impression on those like me that cannot open their mouth very
wide? Help. Please...can someone help me. I went to a major university
dental clinic and they could not help me. Isn't there something that
can be done?

.

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