There are many instances where a tooth may necessitate a crown. This type of restoration is a long term solution in which the crown is permanently cemented to the tooth. Some of these factors which warrant a crown are fractured tooth, tooth treated with root canal, trauma, disease, wear, and oversized failing fillings. There are situations where biting on a tooth may generate radiating pain due to hairline fractures. Also in a root canalled teeth the vitality is lost and the tooth is greatly weakened.
Therefore, a crown helps to support the existing tooth structure. Certain teeth may appear more natural looking with a porcelain crown due to heavy discoloration. In general the goal of a crown is for added support to the tooth with an extremely natural look that is durable, biocompatible, and beautiful.