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Prosthodontics

 

Frequently Asked Questions - Prosthodontics FAQ


  1. How long does a crown last?
  2. How long do my teeth stay bleached?
  3. How is my denture held in place?
  4. Why does my tooth need to be prepared prior to the placement of a crown?
  5. What is the best material that my crown can be made of?

 

 

1) How long does a crown last?
The literature suggests that a crown will last between 15-20 years. This is an average value. Some crowns may last for longer and some may last for less. They tend to fail due to de-cementation and or decay underneath the crown. Sometimes they may fracture but also be repaired in the mouth. The amount of decay of the tooth underneath the crown will decide the simplicity or otherwise of a replacement crown.

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2) How long do my teeth stay bleached?
The evidence suggests that if the patient moderates their intake of tea, coffee and red wine, that bleaching lasts for at least 4 years. Beyond this it is a simple measure using conventional techniques to top up and re-bleach teeth.

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3) How is my denture held in place?
The partial denture is usually held in place by metal clasps which fit to the outside of the adjacent teeth. In the case of full dentures, the upper dentures are held in place acting like a suction cup attached to the upper jaw. The retention of the lower denture is not so stable and is basically held in place by the actions of the lip and the tongue however it is never as stable as the upper full denture.

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4) Why does my tooth need to be prepared prior to the placement of a crown?
A crown is a benefit to teeth in that it can hold the residual tooth structure together increasing its resistance to biting forces. Also it replaces the outside of the tooth in some instances to make the tooth more aesthetic by replacing the discoloured enamel and filling material with new glazed porcelain. In this instance the preparation of the tooth allows a new "skin" to be placed on to the tooth.

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5) What is the best material that my crown can be made of?
There are several materials that crowns can be made of including gold, porcelain, porcelain fused to metal and resin type materials. The material that is used is decided upon on a case by case basis. For instance if strength is required, gold is the material of choice. If aesthetics and function are required, porcelain fused to metal is an appropriate material. If aesthetics is of a high priority then porcelain is used. In cases where the crown is to be a long-term provisional restoration then a resin composite material is appropriate.

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