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Question:
Four (4) Crown Failures: Two years ago I had a root canal done.

Since that time the cap has come off 4 times. The dentist re-gules it. When I ask why this is happening he said saliva gets under there. Last week he glued it for the 4th time and it only stayed in for 6 days. I was eating a potato chip and it fell out again.

He put in a post and a cap that has metal on the bottom of the cap. What causes this to happen? Is it because the cap was made wrong or is too big? ...Visitor from NY

Answer:
From your description it sounds like there is a problem that is unusual.

First Possibility - There is not enough tooth to hold the cap. The dentist needs to determine how more tooth structure can be added to hold the crown tightly. Once enough tooth structure is achieved, the crown should stay on.

Second Possibility - The crown is only a temporary crown and the real crown has yet to be made. Temporary crowns come off more often.

Third Possibility - The dentist did not get the walls of the tooth preparation parallel enough to retain the crown.

Fourth Possibility - During cementation, moisture caused the cement to be too weak. It would be unusual for that to happen four times in a row.

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