ZIRCONIA CROWNS AND BRIDGES

What is Zirconia?

Zirconia is a white metal powder that has been used in dentistry for the past decade to make crowns, bridges and abutments for dental implant crowns.  It is stronger than all-porcelain restorations, but is more opaque and has less translucency, which can affect their appearance.  Therefore, pure zirconia crowns or bridges are recommended for back teeth and for people with a history of clenching or grinding.  Similar to the traditional porcelain-fused-to-metal (PFM) crowns, porcelain can be layered on top of the zirconia to give the restoration a more natural appearance similar to porcelain crowns.  Porcelain-fused-to-zirconia (PFZ) crowns, or layered zirconia crowns, are indicated for front teeth and can be indistinguishable from natural teeth.  The main disadvantage of PFZ crowns is that the porcelain can chip or crack if excessive force is applied to the crown or bridge.

What are the Benefits of Zirconia Restorations?

• Creates a natural appearance that resembles or improves the original tooth

• Creates a natural appearance that resembles or improves the original tooth

• Restores a broken or damaged tooth to its original shape

• Replaces a missing tooth, multiple teeth or all teeth in the mouth

• Stronger than Porcelain restorations

• Improves chewing efficiency

• Very effective for masking highly discolored teeth

What is a Zirconia Crown?

Zirconia Crowns are restorations that cover the external portion of a tooth down to the gum level.  They can be used to simply restore a damaged tooth or they can be layered with porcelain to blend seamlessly with the neighboring natural teeth.  Like porcelain crowns, zirconia crowns are indicated in situations where tooth decay has destroyed most of the original tooth or a large part of the tooth has fractured due to trauma.  The main advantage can be seen in people with severe tooth wear from acid erosion or from grinding or clenching one’s teeth.  Since zirconia is very strong and minimizes wear on the opposing teeth, it is an ideal material to use for people who are hard on their teeth.  In people with a history of grinding or clenching, pure zirconia crowns are usually indicated.

What is a Zirconia Bridge?

A Zirconia Bridge replaces one or more missing teeth by using the surrounding teeth as a foundation.  This creates a literal “bridge” between the remaining teeth and the missing tooth/teeth.  Although a single dental implant or an implant bridge would be the best treatment, a zirconia bridge is a viable option for heavy smokers, people with uncontrolled diabetes, sites with poor bone availability where bone grafting would be needed before dental implant placement, for financial reasons and those patients that prefer to avoid a surgical procedure.

Zirconia is an ideal material when it comes to bridges because it is extremely strong and durable.  The fit is also very accurate because the bridge is milled from a solid block and then fired in an oven to fuse together.  Depending on the location of the missing tooth/teeth and the esthetic demands of the patient, porcelain can be placed on the front of the bridge to give it a more natural look that is indiscernible from the adjacent teeth.