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Crowns

A crown is an artificial restoration that fits over the remaining part of a prepared tooth, making it strong and giving it the shape of a natural tooth. A crown is sometimes also known as a 'cap'.

Why would I need a crown?

Crowns are an ideal restoration for teeth that have been broken, or have been weakened by decay or a very large filling. A crown could be used for a number of other reasons, for instance:

  • you may have discoloured fillings and would like to improve the appearance of the tooth
  • you may have had a root filling which will need a crown to protect it
  • it may help hold a bridge or denture firmly in place.

What is a post crown?

In root-filled teeth it may be necessary to insert a post before placing a crown. A post provides support and helps the crown stay in place. The weakened crown of the tooth is drilled off at the level of the gum.

A post can be made of prefabricated stainless steel which the dentist can fit directly into the root canal, to help secure the crown, or a custom-made post can be constructed by the dental technician to accurately fit the shape of the prepared root canal. The post is placed into the root canal and cemented in position, ready for the crown to be attached.

 

Is there an alternative for root-filled teeth?

If a root-filled tooth is not completely broken down, it may be possible to build it up again using filling material. This 'core' is then prepared in the same way as a natural tooth and the impressions are taken.

What is a crown made of?

Crowns can be made of a variety of different materials and new materials are continually being introduced. Some of the most popular options are listed below.

  • Porcelain bonded to precious metal: this is what most crowns are made from. A precious metal base is made and then porcelain is applied in layers over it.
  • Porcelain crowns: these crowns are made entirely out of porcelain and are not as strong as bonded crowns, but they can look very natural and are most often used for front teeth.
  • All-ceramic crowns: this modern technique offers a metal-free alternative, which can give the strength of a bonded crown and the appearance of a porcelain crown. It is therefore suitable for use in all areas of the mouth.
  • Porcelain and composite: porcelain and composite resin materials can sometimes look the most natural. However, these crowns are not as strong as bonded metal crowns.
  • Glass: these crowns look very natural and are used on both front and back teeth.
  • Gold alloy crowns: gold is one of the oldest filling materials. Today it is used with other metal alloys to increase its strength, which makes it a very hardwearing restoration. These crowns are white or gold in colour.

 

How long will the crown last?

Properly cared for crowns should last for many years. Your dentist will be able to tell you how long the crown may be expected to last.

 

For further information about Crowns, please download our FREE Dentist Guide - available at top right of this page.

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