If you are having a tooth colored crown made it could be a porcelain metal crown or with new technology available today it could be a full porcelain crown. To have enough strength to withstand biting forces, porcelain crowns always used to be built on a metal core. This may result a dark blue or black line at the gum level due to the metal inside the crown.
With new technology it is now possible to make crowns entirely out of porcelain. This high strength crowns maintain a translucency that made them hard to tell from natural teeth. Without metal, the problem of the dark line at the edge of the gum is eliminated. This allows us to place the edge of crown above the gum line which makes it easier to clean and keep healthy.
When you want to improve your smile all porcelain crowns are a beautiful and natural choice.