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.
They are used by cosmetic dentists to improve the look of worn, dark or ugly teeth and in the case of dental bridges, they will also close a gap in the smile. Dental crowns and dental bridges can be made of a varying amount of different materials, such as: Metal and porcelain - Cast metal alloy with a thin covering of Porcelain to make it look like a natural tooth. Gold alloy - A mixture of metal with at least 40% gold content.