Dental crowns can be made from ceramic materials (porcelain), metal (gold), or a combination of both (porcelain fused to metal).
1- All porcelain dental crowns are constructed in a manner where the entire crown is made of all porcelain. These crowns can possess a translucency that makes them the most similar to your natural teeth by being cosmetically pleasing when you smile.
2-All metal crowns, such as gold crowns, can withstand biting and chewing forces well. Gold crowns probably have the greatest potential for lasting the longest because the wear rate is about the same as a person's own tooth enamel.
3-Porcelain fused to metal dental crowns are somewhat of a hybrid between all metal crowns and all porcelain crowns. They have the strength and durability of a metal crown but have the cosmetic appearance of an all porcelain crown.