When the original tooth isn’t strong enough to hold a cosmetic filling, it is necessary to place a crown. The outer 1-1.5 millimeters of the tooth are removed and a crown is placed. The newer porcelain crowns have a dazzling depth of color that can match the existing natural teeth so that the new crown disappears. These crowns are the ones used in instant orthodontics – they can change the position of the existing teeth.
The newest technology uses a zirconia shell to cover the tooth and then the natural appearing porcelain to provide the aesthetics. The zirconia is translucent so the natural color can show through, and they are almost as hard as diamonds so they are incredibly strong.