Thank you for your question and welcome to Just Answer.
I am sorry that you have to have your crown re-made, but under the circumstances, you are better off having another dentist re-make it for you.
Your existing crown will have to be cut off. If carefully done, no damage to your live tooth underneath will occur. Basically, we take out drill and cut a groove in the crown, very slowly. Once we see the cement layer under the crown we stop. We extend this groove up, over and down the far side of the crown, essentially separating it in two halves. Then we just tease the two halves apart, clean off the cement layer and take a new impression for a new crown. A temporary crown is made, and at your follow up appointment approximately two weeks later, your new crown is cemented.
I hope you find this information helpful. If you have any concerns regarding this issue that I have not addressed, please let me know and I will get back to you with more information.
George McKee DDS
I would recommend that you have a local anesthetic for this procedure. Even though when carefully done, your real tooth under the crown shouldn't be touched at all by the drill. the cold water and air that accompany the drilling would feel very sensitive on the tooth.
Unless your dentist has no technical skill at all, the worst that could happen to the live tooth underneath is that the drill goes slightly further past the cement layer and a small groove is polished into the tooth, a fraction of a millimeter at most.
If the drill is taken too far past the cement layer, th nerve of the tooth can be affected causing the tooth to need a root canal. However, this is an extreme situation in the hands of an operator who is not paying attention.
I hope this helps.