If a tooth with a crown on it needs a root canal, it doesn't always need a new crown put on it. There are several reasons to replace a crown, but needing a root canal on a tooth is not one of them. If a tooth that has a functional crown (margins are good, no recurrent decay, good occlusion) needs are root canal, many times it can be done by going right through the existing crown. There is always the danger of the crown fracturing, depending on the material it is made of, so the dentist will usually caution you that a fracture can occur that will lead to the need for a new crown.
Original post by Dr. C on 1/28/08
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