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I have a crown placed a long time ago, and now I noticed a black line at the gum line. What happened?

April 26, 2017ago Black crown Gum happened line noticed Placed time

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I have a crown placed a long time ago, and now I noticed a black line at the gum line. What happened?

1 Answer

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Posted

Until recently, the standard way to make a tooth colored crown is to use porcelain fused to metal crown. The porcelain is baked onto a metal substructure which is needed to provide strength. Unfortunately, it is difficult to mask out the dark color of the metal. Therefore, the margin of the crown has to be in metal. If the gum recedes, the dark metal margin shows more. With the technology we have today, we can eliminate the metal margin, or even eliminate the metal in the crown completely.