Crowns

A crown is a “covering” for a natural tooth.

Natural teeth that would benefit by a crown include:

  1. A tooth that is structurally compromised, missing one or more points (cusps) or has been rebuilt with a filling. Such a tooth is at risk for breaking down further which could compromise the tooth beyond repair.
  2. A tooth that has been root canalled. Root canalled teeth often have a deep hole drilled down the center of the tooth and are potentially at risk of cracking
  3. A tooth that has multiple visible small cracks or crazes.
  4. A discolored, misshaped or unaesthetic tooth.
  5. Teeth that have been severely worn down and have poor chewing efficiency. In such cases, many teeth are crown to rebuild the bite.

Crowns often involve 2 appointments.

At the first appointment, a “temporary” impression mold is taken of the tooth. The tooth is then trimmed down and a “working” impression mold is made of this trimmed down tooth. A commercial dental laboratory fabricates the final crown. The patient is sent home with a temporary acrylic crown (made chairside from the temporary impression mold), cemented with a soft cement.

At the second appointment, the temporary acrylic crown is teased off the trimmed tooth and the final crown is permanently cemented with a hard cement.

At the second appointment, the temporary acrylic crown is teased off the trimmed tooth and the final crown is permanently cemented with a hard cement.

Different types of crowns include: full metal crowns, porcelain fused to mental crowns and all porcelain crowns.

All Porcelain crown

  • Newer porcelain crowns made with a zirconia substructure with porcelain added on to
  • High fracture resistance
  • Excellent aesthetics and translucency

Lab model of prepared tooth

Crown made on lab model

Porcelain fuse to metal crown

  • metal substructure, porcelain is then added to the visible area of the tooth.
  • strength advantages
  • strength advantages

Full Metal Crown

  • Full Metal Crown
  • Highest wear resistance
  • Unaesthetic? Depends on your preference

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