These kinds of crowns can match the colour of adjacent teeth, so they look like natural teeth. With these crowns, you can have more wearing to the opposing teeth as compared to metal or resin crowns. Porcelain-fused to metal dental crowns can also chip or break off. Sometimes the metal underlying the porcelain can show through as a dark line. These crowns can be a good option for front or back teeth where the strength of metal is required.