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You shouldn't have to remove the crown, unless there is decay under it that spread to the nerve, in which case the crown will have to be remade. If the reason for the root canal is just the nerve...

That sounds right... insurance won't cover a new denture right away... your only option, unfortunately is to maybe go to a dental school and have a dental student make a new one for you, if you have...

You most probably have some sore spots that are from your denture rubbing on your bone... call your dr and have him adjust the denture a bit.

Sometimes people experience "phantom pain." Your body still thinks you have a tooth there. Also, nerves in the gum tissue have been aggravated.