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Crown keeps coming off

User Level:
Patient
Posted by: flykite  (9 years ago)
Hi,

Six months ago, I got a temporary crown on my bottom molar on the left side. One week after it was installed, it fell out. The dentist put it back on. After four days, it fell out again. When I went to the dentist, my permanent crown had already arrived. When he fitted it in, it did not align properly. He made a second impression and sent it back to the lab. He put the temporary crown on with a stronger glue. After two weeks, I got the permanent crown in. This too came loose within a week of installation. The dentist fixed it but yesterday, the crown came off while I was having lunch. What procedure should be done to keep the crown fitted in tightly? Should I find another dentist? I don’t want to lose this tooth. I would be grateful for your help.
User Level:
Dentist
Hi,

Six months ago, I got a temporary crown on my bottom molar on the left side. One week after it was installed, it fell out. The dentist put it back on. After four days, it fell out again. When I went to the dentist, my permanent crown had already arrived. When he fitted it in, it did not align properly. He made a second impression and sent it back to the lab. He put the temporary crown on with a stronger glue. After two weeks, I got the permanent crown in. This too came loose within a week of installation. The dentist fixed it but yesterday, the crown came off while I was having lunch. What procedure should be done to keep the crown fitted in tightly? Should I find another dentist? I don’t want to lose this tooth. I would be grateful for your help.


It is rare for crowns to come off. They come off only when:

The prepared tooth is too short.
The sides of the prepared tooth are too tapered.
The accuracy of the impression was poor, so the working model was physically different (usually larger) than the actual tooth.

Tell your dentist to sandblast the inside of the crown and then the tooth, then cement the crown with Metabond. Even on short or overtapered teeth, this cement usually holds.
Posted 9 years ago
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