Procedures - Crowns

Crowns

A crown fits over the entire top of the tooth. Crowns cover, protect, seal and strengthen a tooth. A crown is needed when a filling just will not work. A crown may be made of gold, porcelain fused to gold, white porcelain, or indirect composite. Dr. Evans, Dr. Nordin-Evans and Dr. Carney recommend using non-metal crowns in most every case. The specific material will be chosen based on strength, biocompatibility, and esthetics.

There are many situations that may call for a crown:

Large decay. If a tooth has decay so deep and large that a filling will not stay, or if the tooth structure is weakened, a crown must be placed on the tooth to save it.

Large old fillings. When large old fillings break down, or get decay around them, they usually need to be crowned. It is important to crown a tooth that has been structurally weakened to prevent a cracked or broken tooth. Once a tooth breaks, it may not be possible to save it.

Cracked tooth. When a tooth is cracked, a filling will not seal the crack. A crown has to be placed over the tooth to hold it and the crack together. If a crown is not placed on the tooth, the tooth will become sensitive to chewing pressure, or will eventually break. It is important to crown a cracked tooth before it breaks, because in some cases a broken tooth cannot be crowned and must be extracted.

Broken / Fractured tooth. Sometimes a tooth that has broken is too weak to hold a filling. A crown will hold the tooth together and prevent it from breaking again. If the fracture involves the nerve, you may choose to have Root Canal Therapy completed before the tooth is crowned. If a root canal cannot be performed or if you have chosen to avoid a root canal for health reasons, an extraction is needed.

Broken tooth This patient chose not to have the cracked tooth above crowned, and it later fractured. This tooth had to be extracted because it cracked all the way to the root.

Sensitive teeth. Teeth that are very sensitive, either from a lot of "wear," or from receded gums, sometimes require crowns to seal and protect the teeth from hot and cold sensitivity.

Root Canal Therapy. A tooth that has undergone Root Canal Therapy will need a crown to properly seal and protect the tooth. A tooth with Root Canal Therapy is more brittle than a tooth with a healthy nerve and blood supply. A crown provides the necessary support to the tooth.

In cosmetic dentistry, crowns (sometimes called "caps") are rarely used since the advent of veneers, but in some cases a crown may be necessary for a particular tooth. A tooth with a bad fracture or a large filling may be a candidate for a crown instead of a veneer.

before photo Before: This tooth has a large filling as shown. A crown is needed on this tooth, instead of a veneer, because there isn't enough natural tooth left to support a veneer. A crown will cover and protect the tooth, but will look the same as a veneer.

after photo After: The top teeth now have veneers, except the one with the large filling, which has a crown.

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