Hi had a PFM crown put in for molar. dentist said best to use a PFM as it is slightly stronger but in time, I MAY get a grey line around the gum line as the gum recedes. However as soon as he put it in I saw a very clear grey line and obviously that is not due to receding gum. He says it is not the metal showing but rather the color difference between my tooth and the crown. But the crown actually matches it very well. So is it because he didn’t push It far up in enough ？
February 14, 2018
Answer: Gray line Pfm crowns have been around for a long time and have a very good track record. As far as being the “strongest” that is not true. We have a few options that are stronger such as a full gold crown or a full porcelain crown made from zirconia. The gray line is where your tooth under the crown and your crown meet or the joint between the 2. Your underlying tooth shade is always darker than the crown. If the tooth has had a root canal or has had a large amalgam (metal) filling for a long time the tooth will be much darker as well. I personally try to keep my restoration margins right at or slightly above the gum line for ease of cleaning. If all of the margins are above the gum line and you have a good fitting restoration you should have a better long term success rate for that restoration. If you do not want to see the margins than you need toplace them below the gum line but that will decrease the lifespan of the restoration. So long story short. If you do not like the esthetics of the restoration you should talk to the dentist that placed it. Hope that helps
Helpful
February 14, 2018
Answer: Gray line Pfm crowns have been around for a long time and have a very good track record. As far as being the “strongest” that is not true. We have a few options that are stronger such as a full gold crown or a full porcelain crown made from zirconia. The gray line is where your tooth under the crown and your crown meet or the joint between the 2. Your underlying tooth shade is always darker than the crown. If the tooth has had a root canal or has had a large amalgam (metal) filling for a long time the tooth will be much darker as well. I personally try to keep my restoration margins right at or slightly above the gum line for ease of cleaning. If all of the margins are above the gum line and you have a good fitting restoration you should have a better long term success rate for that restoration. If you do not want to see the margins than you need toplace them below the gum line but that will decrease the lifespan of the restoration. So long story short. If you do not like the esthetics of the restoration you should talk to the dentist that placed it. Hope that helps
Helpful
