Dental Forum

Treatment for Dental Cavity at base of Dental Crown

By Joan 3/6/2011 1:24:03 AM
I have xexcellent dental health. At my 6 month checkup, the dental probe foud a cavity at the base of my 5 year old lower molar crown. Xrays did not show anything. One dentist wants to remove and replace the crown; another says he can fill the cavity without removing the crown. The dentist who wants to replace the crown says if not, he will be "working in the dark" and if he does not get the whole cavity, it could lead to nerve damage, a root canal, a post and then a crown but he will do it if I want.I'm 61 with all of my teeth and no root canals. your opioinion please? Thank you.
Posted By : Dr. Ritz on 3/6/2011 1:24:03 AM

Ideally if there is cavity below the crown then the crown should be removed and cavity should be filled and again the tooth should be crowned. Your dentist is correct in saying that without removal of crown, the full extent of decay will not be known and further complications can be there. Moresoever if another crown is put after doing the filling then the filled part can also be covered in crown and your tooth will become more safe. Rest the decision depends on thorough clinical examination of tooth. For more info on dental crowns you can check this article....

Posted By : Joan on 3/6/2011 5:16:28 AM
Thanks for your prompt response. Can there be a cavity under the crown that does not show on xray?
Posted By : Joan on 3/6/2011 7:15:22 AM
Can the cavity be filled first before removing the cap? Then remove the cap and if there is no further decay under the cap, replace the original cap and fill the cavity?
Posted By : Dr. Ritz on 3/6/2011 8:34:34 AM
It is possible that cavity does not show on xray as xray is 2 dimensional. If the crown comes out without sectioning it then you can get cavity filled and reuse the crown but normally the crowns are removed by sectioning them. You can get the filling without removing crown but extent of decay is not known then.
Posted By : angela on 3/28/2011 8:29:01 PM
I had a deep cavity well below the gumline underneath a crown. The dentist removed the crown, cleaned out the decay, and now has a temp crown in place. He says he does not need to fill the cavity space, that the new crown will take care of that. This makes no sense to me at all. Is this possible? It is a large hole on the x-ray.
Posted By : Dr. Ritz on 3/29/2011 7:39:53 PM
If the cavity is not very deep an will be cut out during tooth preparation for crowning then there is no need to fill it but if it is deep then first filling has to be done and then crown should be put after proper tooth preparation in that area. If you doubt then you should take second opinion.
Posted By : angela on 4/27/2011 3:55:23 PM
He put the crown on and I was very suspicious of him, and had it x-rayed yesterday at the local college, and there is decay beneath the new crown, clearly seen on the x-ray. I'm going to a new dentist on Monday. Do you think the new dentist can take the new crown off, clean the decay, and put the new crown back on? Or will I have to have a new crown. I don't have enough money for another crown, but don't think the bad dentist will give me my money back. He's very rude, and I don't want to go back to him. Otherwise, I'll have to have it pulled I guess.
Posted By : Dr. Ritz on 4/27/2011 8:01:08 PM
It depends if he doen't have to section the dental crown to remove it and the dental crown comes out as such then after the treatment he can put that dental crown back but if he has to section dental crown to remove then you have go for another new dental crown.
Posted By : Ted Adams on 5/20/2012 7:54:34 AM
I have a cavity below a crown. My dentist said I need to have a root canal before he can fill it. He did not suggest I needed to have the crown removed and replaced. Do I need a root canal before I have the cavity filled? Thanks, Ted Adams
Posted By : Bethany on 6/1/2012 10:56:06 AM
I have had a gold crown on my last top molar for 11months. At my check up, my dentist said there is now a HOLE in the gold crown. He wants to drill and fill it. I think this will compromise the integrity of the crown. How do I get him to replace the crown rather than temporarily fix it??? Am I right in thinking the filling will damage the crown?
Posted By : Dr.Ritz on 6/4/2012 2:45:27 AM
BETHANY, it is recommended to get the whole thing replaced rather than undergoing a repair and only keep the repair an option only if you can't afford the re-treatment.

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