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.
This type of crown is made entirely out of some type of dental ceramic, such as porcelain. When they're made, they can either be: 1  Handcrafted by a dental technician.  Carved out of a single block of ceramic by a computerized milling machine (CAD/CAM unit).