At times esp lately i've been getting a sudden squeezing/tight sensation like a vice grip cramp on my right jaw. sometimes it feels like it wants to shift/move. after i feel sore. hx of tmj. need a new crown in that area. fillings as well. tmj still?

Appears you need a dental splint made by a prosthodontist. No hard foods/candies, gun chewing, jowling. Apply warm moist compresses, take Ibuprofen.

Based on the symptoms described, it is possible that you have a temporomandibular joint (TMJ) disorder. TMJ disorder can cause pain and discomfort in the jaw joint and muscles that control jaw movement. The squeezing/tight sensation and soreness after could be due to muscle spasms or inflammation in the joint. This and the restorations need attention.