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Dental Crowns


What are dental crowns?

Dental crowns are commonly called as “dental caps” or “tooth caps”

They enclose the entire visible crown portion of the tooth upto the gum line.

They reconstruct and reinforce or provide strength to the damaged tooth structure and thereby increase the longevity of the tooth.


When does a tooth need a crown?

  • * Root canal treated tooth( Since root canal treated tooth becomes brittle)
  • * Severely worn off tooth surface with the presence of sensitivity.
  • * If large fillings are present that weakens the tooth
  • * When tooth presents with cracks on their surface
  • * Extensively damaged tooth due to decay
  • * Used to improve appearance,shape and alignment of tooth.
  • * For correction of spaces between the teeth

What are the different types of dental crowns?

  • All ceramic crowns (E-max, lava)

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• Ideal crowns for esthetic correction and front tooth/teeth replacements.

• Made of ceramic particles.

  • Metal – ceramic crowns

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• Ideal crowns for posteriors (molars )to with- stand the bitting forces.

• Inside is the metal on which ceramic is built up.

  • All metal crowns

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• Not used commonly now because of its metallic appearance.

      • Zirconia crowns

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• Stronger than all ceramic.

• Adapts well to the shape and colour of the tooth.

      • CAD-CAM

• It is one of the recent advancement in the field of dentistry.

• Solid blocks of ceramic is milled using CAD CAM(computer aided design-computer aided machining). It is very strong, more accurate and requires less time for fabrication.

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How is a dental crown prepared?

Preparation of a crown includes 2 visits to the dental clinic.

I visit: Alteration of the tooth by reducing the tooth structure on all the surfaces to receive a crown. Impression of the prepared tooth is taken and sent to the lab for fabrication of the permanent crown which usually takes 3-4 days. In the meantime a temporary crown is given to protect the tooth structure between the dental visits.

II visit: Once the permanent crown comes from the lab, it is tried on the patients tooth and after checking for the comfort, the crown is cemented permanently.


In what way are dental crowns advantageous?

          • * Colour matches the existing teeth.
          • * Strong & durable material
          • * Has a very good success rate in treated patients
          • * Restores the original size and shape of the tooth.
          • * Reinforces the tooth.

 

Authored By : Dr. S. Hemamalathi and Dr. K. S Senthil Kumar

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