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.
A crown made of amalgam will look like it's made of silver but is actually a combination of at least two metals. This type of crown can be especially good for primary molars (the baby teeth at the back of a child's mouth) because it is very strong and will be able to handle the force of chewing with the back teeth.