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.
There are several reasons why a dental crown might be made for a tooth. Dentists routinely use them to: Repair and strengthen damaged teeth. Improve tooth appearance (including color, shape and even apparent alignment).