Root Canal Crown causes pain

I just got a permanent crown put on my root canal tooth and 2 days later, i have pain when eating something hard or crunchy.  My root canal was done 7 years ago and i have had no problems but it was recommended to put a crown on it so i did.

i went back to my dentist who put on the crown to let him know i was having pain.  he checked the bite and said it is fine, gave me antiobiotics and referred me to a specialist to look at the root canal.      

why would getting a crown cause pain when 1. the root should be dead and 2.  i had no pain for several years?  is it possible the antibiotics will solve the problem?  

Thanks for advice.

[Jerome Bogin, D.D.S.]

It is possible that there was a residual infection on this tooth that was quiescent and was stimulated by the preparation for the crown. If this is the case I do not feel that the antibiotics would be a resolution of the problem in the long range. If this is the case it is possible that the root canal would have to be retreated.I do not know if a post was placed in this tooth and the possibility of a fracture must also be considered.

[mike1105]

I have no idea why you were given antibiotics. It makes no sense unless there are signs of an infection. perhaps the bit is still a bit off, perhaps the crown is irritating your gum tissue. putting a crown on a tooth that has an asymptomatics root canal hould not all of the sudden start causing pain. perhaps the tooth should be taken out of occlusion altogether (so you dont touch it at all when you close your teeth together). this is probably how it was before you had the crown done.