I know this is a very old thread but OP, how did you get on? What was the outcome? I have just been diagnosed with this 'cracked tooth syndrome' and my dentist can't find the crack :-(
It hurts when I bite down on certain things / in a certain way. X Ray shows nothing. Dentist can't even confirm which tooth it is. She made me bite down on the plastic thing but I can't recreate the pain in the chair (I tried my best at two separate appointments!)
She said we'll have to leave it for now but I'm scared leaving it will make it worse. I clench my teeth in my sleep, I really don't want to loose the tooth! Apparently implants can be difficult for people who grind / clench in their sleep.
Hoping for some encouraging words....