Q What is a crown?

A crown/cap is a porcelain/metal covering for the tooth, which mimics the natural appearance of the tooth.

If a tooth is either badly broken down due to decay, has a fracture present, has been heavily restored or weakened after a root canal treatment, provision of a crown may be necessary. The placement of a crown will replace large amounts of missing tooth, protect and strengthen the underlying tooth tissue and improve the tooth's bite and appearance.

Q What will the treatment involve?

If the tooth is alive local anaesthetic is given so that no discomfort will be felt. The tooth will then need to be trimmed to the correct shape so that there is enough space present for the crown to be built by the laboratory. A silicone impression will then be taken which is sent with an impression of the opposing dental arch to the laboratory for the crown to be made. A temporary crown will then be made at the chairside and fitted.

Q How many appointments will this take?

If a tooth is very badly damaged, it may be that the only way to achieve secure anchorage is to fit a metal post into the root canal of the tooth. This provides extra support, and in many cases is the only way to repair a badly broken tooth.

Q How is a crown fixed to the tooth?

There are a number of special adhesives and cements used in fixing crowns to teeth. The inside of the crown is filled with a liquid cement, this is then pushed down over the tooth using firm but gentle pressure. The cement then sets and any excess material is removed from the edge of the crown and from between the teeth.

Q Will the treatment last forever?

The placement of a crown on a tooth is a repair of a damaged unit and has a limited lifespan. Problems may shorten the crown's lifespan such as recurrent decay, fracture or loss of the tooth. Usually a crown would be expected to last 5-7 years before it will require replacing, but crowns often last longer than this.

Q What types of crown are available?

A large variety of crowns are available from solid gold crowns, white porcelain fused to metal crowns and all porcelain crowns. The type of crown used depends on the area of the mouth, the aesthetics required and the financial cost.

Q How can I prevent this happening again?

The simple way to avoid this is by good dental care to initially prevent decay and regular examinations to detect and prevent future problems. All patients taking part in amateur sports are advised to wear a mouthguard, which is especially important to protect your crowns.