Crown (tooth)

Tooth Anatomy

Cross Sections of Teeth

A crown is a type of dental restoration which completely caps or encircles a tooth or dental implant. Crowns are often needed when a large cavity threatens the ongoing health of a tooth. They are typically bonded to the tooth by dental cement. Crowns can be made from many materials, which are usually fabricated using indirect methods. Crowns are often used to improve the strength or appearance of teeth.

Types of crowns

There are various types of crowns, including:

• Porcelain-fused-to-metal (PFM): These crowns are constructed with a metal shell on which is fused a veneer of porcelain in a high heat oven. The metal provides strong compression and tensile strength, and the porcelain gives the crown a white tooth-like appearance.

• Gold alloys: These types of crowns are often made with a mix of gold, copper and other metals. They provide a strong bond to the tooth, do not fracture or wear away the tooth itself.

• Base metal alloys: These are made from non-noble metals that are highly resistant to corrosion, and make for a very strong crown.

• Ceramic crowns: These are made of a porcelain-based material and are used primarily for restoring front teeth due to their superior aesthetic qualities.

Procedure

The procedure for placing a crown involves a number of steps, including:

• Tooth preparation: This involves removing the outer portion of the tooth to accommodate the crown, and if the tooth is decayed or damaged, the dentist will remove the affected areas.

• Impression creation: An impression of the tooth is taken to provide an exact mold for the crown.

• Temporary crown placement: A temporary crown is placed to protect the tooth while the final crown is being made.

• Crown placement: When the final crown is ready, the temporary crown is removed, and the final crown is cemented onto the tooth.

Risks and complications

Like any dental procedure, there are risks and potential complications associated with getting a dental crown. These may include:

• Tooth decay: If the crown is not properly sealed, decay can occur under the crown.

• Sensitivity: Some patients may experience sensitivity to hot and cold temperatures after the procedure.

• Discomfort or pain: Some patients may experience discomfort or pain after the procedure.