Just look around you on the street: there are many people with ugly crowns. Why is it, are these crowns always made wrong? No, you don't have to. Many of the crowns on front teeth were made at a young age at a time when the technique of firing porcelain was not as advanced as it is today. The teeth of the owner of the crown have changed over time, not the crown. The own teeth have become darker, the crown remains white.
What often happens is that a crown edge becomes visible. As you get older, your gums will pull back. A crown edge that was neatly hidden beneath the gums when the crown was made becomes visible. If it concerns an older type of baked-on porcelain crown, the border appears black.
A crown whose edge is exposed does not always have to be replaced. If the crown is also not beautiful in shape or color, then replacing is a good option. If the crown is completely to your liking and only the edge is not beautiful, it can be masked. In the past this was not possible, existing plastics did not adhere to the porcelain of the crown. This problem has since been resolved. It is still a treatment that requires great accuracy, but it is certainly no longer impossible. Special plastics are used for masking, which are also opaque in a very thin layer, called opaques. These plastics are glued to your tooth neck and crown edge with an adhesive that adheres to both dental bone, porcelain and metal. So even a golden crown can be masked with this.
Crown too convex or white
A crown that is too convex or too white can also be changed. In both cases the top layer can be ground off the porcelain and rebuilt with composite. For a crown in the lateral part of the mouth, this can produce a very acceptable result. The end result is often not good enough for a crown in the middle. This is because there are two problems. Firstly the adhesion, composite is difficult to attach to porcelain, although nowadays better and better adhesives are being marketed. The second problem is the shine. A porcelain restoration is finished with a high-gloss layer. This is as hard as glass. It is not possible to obtain the same top layer with composite. Although there are relatively hard composites on the market today that can be polished fairly well, the end result will not be the same as that of porcelain.