Existing Crown very sensitive

[alyrichards]

I have a both my upper 1's crowned and have had these for 12 years. Suddenly today the right one is extremely sensitive to hot and cold and thre is a slight dull ache. I have had no problems with these before I have had tonsillitus for the past couple of days with sinus problems but having had continuing sinus problems thought this is unlikely to be linked. There is no pain on tapping so I don't think its an abcess. (i was a dental nurse 20 years ago so do have a bit of knowledge). Would be grateful for any advice as i think i am going to struggle til the dentist opens on Monday.

Many Thanks