Conservation of mass for a chemical that is transported (fig. 1) yields the advection-reaction-dispersion (ARD) equation:
Your dentist may also place a temporary crown while the permanent one is being made. Types of Dental Crowns. There are four different types of dental crowns. Ceramic â These are used for restoring front teeth, and are popular in this area for their ability to blend with your natural tooth color. The crown is made of a porcelain-based material.
New Jersey Dental Crowns. 1  A dental crown, also known as a cap, is used for a tooth that has large areas of decay, large fillings, or is severely damaged. Porcelain dental crowns may also be used to create a complete smile makeoverâwhitening, straightening, closing gaps, and reshaping the existing teeth.