I did not have radiation but my surgery was rather intrusive. Immediately after surgery, I began a regime using tongue depressors to stretch the jaw musciles (that doesn't look right, oh well).

I would stack up as many as I could bite then commence wedging in additional ones between what I had in my mouth. I would continue to add depressors till the pain was so intense I couldn't tolerate it. I would then hold it for 20 minutes, then remove the depressors.

I did this on the order of 10 or so times a day for a very long time. I began with 10mm of opening and ended with 58mm. Not easy but essential. I am so happy I endured this to get what I have today. It greatly enhanced the prosthodontist ability to provide a prostheis of optimum value and has really improved my quality of life.

I have no idea if this will work for you or anyone reading this, but it did for me. Some of my success may have been implementation of the plan IMMEDIATELY after surgery. I don't know if this is adviseable for anyone who has had trismus for any length of time. I would suggest you consult your medical professional before embarking on this course of treatment. It worked for me, but under MY circumstances.

For what it's worth.....Cowboy