Mar 18, 2016. There are 11 major organ systems in our body. This includes the circulatory, respiratory, digestive, excretory, nervous, and endocrine systems. As well as the immune, skeletal, reproductive, muscle and integumentary systems.
Dental crowns can be made up of all different sorts of materials -- porcelain or a combination of porcelain with metal. The type that's chosen not only depends on where the tooth is situated, but what the condition of the tooth is (how discolored it is and how decayed it is), as well as the condition of the gums.
Crowns can be made of metals such as gold or palladium or a combination of several metals. Porcelain can be baked onto the metal, much like a bathtub, to make the crown look like a natural tooth. There are all ceramic materials used today with dentists claiming that the teeth have no metal. The teeth look all white.