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A
crown fits over the entire top of the tooth above the gum line. 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 white porcelain, or porcelain fused to gold. 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. A tooth that has broken is usually 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, Root Canal Therapy may be required before the tooth is crowned. In some cases, a broken tooth cannot be saved and must be extracted.
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 used less frequently 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:
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:
The top teeth now have veneers, except the one that had the large filling,
which now has a crown.
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