DON'T LET THEM PULL YOUR TOOTH!!!!!!
Hi, if you had a cracked tooth that was restored with a crown, you're good. That's the purpose of the crown-to restore the tooth and hold it together. Chances are, it's not cracked again. When you get a tooth prepped for a crown, they completely remove the broken piece, thus, you have very minimal amount of tooth structure left if a large piece was broken. In fact, the main reason crowns are placed is because too large of an amount of tooth structure was lost. If you had a root canal, you would not feel any pain from a crack, which would obviously not be present, anyway, because of the crown. It is possible the root canal failed if there is an accessory root canal that is inaccessible by the dentist. Sometimes dentists will refer you to an endodontist - a specialist in root canals - and they will re-open the canals, re-clear them, and re-fill them. Sometimes this is effective, sometimes it is not. It is worth a try - you never want to lose a tooth if at all avoidable!!! That's a whole different explanation, but it is very important that you do everything possible to keep a tooth - even one with a root canal...especially one with a root canal after you spent the time/money it!
As far as an allergy...this is very possible and very common. First of all, what type of material is the crown made of? Is it the permanent crown or the temporary crown? If it is a metal crown, or has any metal in it at all, it is possible you have an allergy to the metal. Many people have metal allergies and metal crowns in their mouths and will always have some irritation. Often times, the allergy goes away on its own after a period of time. If it is a temporary crown, it does not by any means fit the contour of your gingival margin. This will most definitely always cause irritation.
If your dentist does not detect any infection, your root canal may still have been ineffective...you may not have an active infection due to your antibiotic medication, but you may still have some feeling in the tooth if an accessory canal was not cleared. (An accessory canal is not abnormal, but atypical. Teeth have a "usual" number of roots, depending on which tooth it is, but sometimes teeth will have misplaced, or extra root canals which are very difficult to access because they are at a horizontal angle into the tooth or too small to instrument.)
I don't think the previous reply is coming from a well educated person in dental restorations and treatment. I will tell you I have some experience in the dental office as a [removed], and am almost done with dental hygiene school. I've seen a lot in the dental office, and am confient in my advice to you. Good luck!
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