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Questions and Answers

Post-and-Core Tooth Repair

  1. What is a post-and-core?
  2. Why is a post-and-core necessary after root canal treatment?
  3. How is a post-and-core made?
  4. Is a post-and-core always made in a dental laboratory?

 
1. What is a post-and-core?

  • A post-and-core is a metal component of an extensive tooth repair:
    • It is a thin metal rod that is cemented into the root of a tooth.
    • It consists of a post that fits into the root canal, and a core portion that projects above the gum.
  • A new replacement crown will be cemented into position over the core.
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Core
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After crown is fitted

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2. Why is a post-and-core necessary after root canal treatment?

  • Teeth that are treated for root canal problems are often badly broken down.
  • They need to be built up before they can have a replacement crown fitted over them.
  • Post-and-core fabrication is the method of choice for the build-up process.
Click to enlarge
Before
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Core preparation
Click to enlarge
After

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3. How is a post-and-core made?

  • After a root canal treatment has been completed, the dentist will shape the root canal and pulp chamber.
  • An impression of the prepared tooth will be taken, and a dental technician will make the metal post-and-core.
  • The dentist will then cement the post-and-core into the root. The core and remaining tooth will be finally shaped before a replacement crown is made to fit over it.
  • The x-ray below is of two post crowns. The posts have been cemented into the root that roots.
Click to enlarge
2 post crowns

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4. Is a post-and-core always made in a dental laboratory?

  • Prefabricated post systems are available.
  • The dentist can select a suitable ready-made post and cement it into the root.
  • A core is then built around the part of the post that projects above the root, using special materials.
  • The replacement post crown can then be made and fitted.

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