Judy,
I'm sorry for your ongoing dental situation. Poor dentistry is becoming the standard of care brought about by a lack of education. With all do respect your situation is not about what kind of crown to get, it's about whats causing you to need crowns. In fact, TMJ is more than likely involved with your problems.
I have talked about it for many years and I will continue to educate those who choose to seek the best care available.
I hope and pray when I read the final part of your story that you are ok :)