Why do I still see a slight gray line at my gumline with an all-ceramic crown? (Photo)

Question

Last week, I had a PFM crown replaced with all-ceramic and there's still a slight gray line at the gum margin. What is this from, and is there any way to get rid of it completely? I've been told that my whole gum area above the crown will always be discolored from the dark root showing through, but I don't understand why there's still a line. The entire crown has a slight gray "dingy" color to it. Is there any way to fix this after the crown has already been cemented in? Thank you in advance!

Andrea Stevens, DMD · Answer

This is likely a two part problem. Without further information, I would say the first part is that the tooth has had root canal treatment, which often significantly darkens the tooth. The second part is a thin gum tissue type, which allows that colour to be seen. In some cases, the tooth can be adjusted prior to making an impression for the crown so that the dark colour can be blocked out. However, depending on how high your smile line is this may never be fully covered.

Why do I still see a slight gray line at my gumline with an all-ceramic crown? (Photo)

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