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Question:
New Crown Porcelain Ground Off: I just had an expensive porcelain crown put on tooth #30.
When the dentist put it in, it was way too big and needed to be shaved down a lot, so much so that he told me a bit of the silver may show through. He said it wouldn't be too much, but when he put it in after cementing it and I looked in the mirror, I was unhappy with it.
I feel that since I paid so much for it, it should be perfect, although I'm the only one who's going to see it.
If I have it removed and replaced, what is the chance that the original permanent tooth will be damaged? Is there anything the dentist could do that could keep the crown in but somehow bleach that silver spot? ...Visitor from IL
Answer:
The silver spot on the crown can not be bleached.
The type of crown that you presently have is a porcelain fused to metal crown. The metal framework has a thin layer of opaque porcelain followed by several additional layers of porcelain.
During the adjustment the porcelain and the opaque layers were ground off. In addition to the cosmetic concern, the remaining thickness of the metal is unpredictable. The longevity of the crown may be affected.
There are several reasons why the crown required so much adjustment:
- The first is insufficient tooth reduction during preparation. This problem can be avoided by having the provisional made prior to the final impression. The thickness of the provisional crown is measured with micrometers.If there is insufficient thickness additional reduction is required. The provisional is relined and re-measured. This ensures that the laboratory will have sufficient space for all of the layers of material. The final impression is taken after the provisional is used as a verification step.
- Another possibility as that the models did not accurately reflect the situation in your mouth. There are many factors which could lead to inaccuracies
- The final possibility, if the tooth was farthest back in your mouth, is your jaw seated all of the way in to the TMJ. This would reduce the available space for the final crown. If you notice any difference in your bite, headaches, popping,clicking or other symptoms that have changed as since the placement of the crown make sure they are addressed by someone who has a logical explanation.
In order to fix the silver spot, the crown needs to be remade.
Editorial Staff
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