Cosmetic Dentistry Blog Cosmetic and General Dentistry Questions Answered

April 23, 2018

What to do about gray crowns

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Hi Dr. Hall,

Due to a recent fall, I broke my 2 front teeth as well as the one to the left of my front teeth. I had 3 root canals and 3 porcelain crowns placed. I’ve had 2 attempts as the first permanent set were off in color, too big and thick. The 2nd permanent set matched in color and were closer in size and thickness to my natural shape. After they were permanently cemented they all had a grey hue close to the gumline on the tooth. The dentist has reluctantly agreed to redo my crowns stating he would try to make sure the core is as white as possible. I’m not sure what to think or if he can even fix the issue because he did say he couldn’t promise this issue would be resolved? What are your suggestions? Thank you!
– Nancy from San Antonio

Your problem is simply that your dentist doesn’t know enough about cosmetic dentistry.

One of the issues that family dentists have the most trouble with is color, so the problem he is having is not unusual.

If you have two or more crowns on your front teeth, this is a pretty simple color task for an expert cosmetic dentist. The fact that these crowns were too big and thick and the color was off on the first try makes me worry about the level of skill here. On the second try, having them be too gray at the gumline is not a great confidence builder, either. This isn’t a difficult situation. My advice would be to be fussy. It is possible to get the color and shape exactly right and in the right hands, no one should be able to tell that these are crowns on your front teeth and not your real teeth. Don’t settle for anything less than that.

You’re not giving me any clinical details about the types of crowns we’re dealing with, and there are several possibilities for getting this grayness that you’re seeing. Let me make an assumption of what I think is the most probable scenario. My best guess is that your dentist is using pure ceramic crowns of one type or another with a metal post and core to reinforce the inside of the tooth, and the gray color of the metal is showing through the translucent ceramic. There are several ways to deal with this. If I were doing your case, I would have used a fiberglass post and a composite core that was close to the color of your natural teeth. That’s the easiest way to get a natural translucency to the crowns. If we’re stuck with the metal core, then what I would have done would have been to bond an opaque layer on top of the metal to block out the metallic color and then bond the crown on top of that opaque layer. Another option would be to give clear instructions to the laboratory technician about the color and extent of the metal core, and let the technician incorporate opaquing into the crown.

The problem with many family dentists is that they don’t understand translucency and the impact of interior colors on the external appearance of the tooth.

Your case bothers me, though. You’ve had this accident, and you would think that you should be able to go to your family dentist and he would know enough to fix this. Or, if he didn’t, that he would know enough to refer you to someone with more expertise in cosmetic dentistry. But that is the state of cosmetic dentistry in America. Dental academia trivializes cosmetic concerns and the powers that be in the profession are adamant that cosmetic dentistry isn’t a legitimate specialty. If there were a higher level of respect in the profession for aesthetic skills, there would be more inclination to either refer these cases to a specialist, or maybe to train general dentists better in these color skills and you wouldn’t have situations like yours. Your case doesn’t require a high level of aesthetic skills—only a moderate level. The fact that your dentist has missed this twice and now is unsure that he can fix the color shows a fundamental lack of understanding of basic color management.

Dr. Hall

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About David A. Hall

Dr. David Hall was one of the first 40 accredited cosmetic dentists in the world. He practiced cosmetic dentistry in Iowa, and in 1990 earned his accreditation with the American Academy of Cosmetic Dentistry. He is now president of Infinity Dental Web, a company in Mesa, Arizona that does complete Internet marketing for dentists.

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