Clinicians who wish to provide patients with excellent dental restorations often choose zirconia crowns. These crowns are chosen over conventional PFMs (Porcelain Fused to Metal) or full-gold crowns due to:
● Superior strength
● Excellent aesthetics
Most dental practices are switching from the conventional PFM crowns and moving towards the use of zirconia for creating fixed dental restorations. Because zirconia crowns and bridges possess excellent esthetics and are virtually indestructible, zirconia is becoming the most popular material for making dental crowns and other restorations.
Should you choose Solid Zirconia or Layered Zirconia?
● Has a natural translucency and opalescence
● Generally recommended for posterior crowns.
● Particularly suitable for patients who may grind their teeth because of its high strength.
● Only minimal clearance is required and there is low wear on opposing teeth.
● Very effective for masking highly discolored dental preps, specifically those that have darkened due to previous dental treatments
● More translucent and opalescent.
● Especially suitable for anterior crowns.
● May also be used for posterior crowns if there is sufficient clearance from other teeth.
● When done skillfully, the very best aesthetic results can be achieved.
SOLID & LAYERED ZIRCONIA
Both solid and layered zirconia crowns have a strength and consistency that is comparable with traditional PFM restorations, yet they provide far superior aesthetics.
Advantages of Choosing Zirconia Crowns
- Zirconia crowns are highly biocompatible, as the smooth surface helps to reduce plaque accumulation. Layered zirconia crowns are extremely durable. Even though the porcelain used for layering does not have the strength of solid zirconia, they are designed to bond with the zirconium substructure, making chipping or fracturing extremely rare. The material also promotes a healthy tissue response.
- Due to a wide variety of factors including chemical composition and processing requirements, there are many ways zirconia can be manufactured to suit the needs of the patient. This customization minimizes the margin for error and ensures excellent fit for each individual.
- Zirconia is suitable for patients with metal allergies or who would prefer to have metal-free restorations.
- Zirconia is metal-free, which prevents darkening around the gingival area. This eliminates the possibility of metal margins becoming exposed due to gum recession.
- The translucent nature of this material can transmit the color of adjacent teeth and it is manufactured in a wide variety of shades, making it easy to accurately match the color of the patient’s natural teeth.
- Using computer-aided design and manufacturing processes provide patients with a precise fit, reducing the chair-side time required for adjusting and cementing these restorations.
- Zirconia crowns can be conventionally cemented in place by using Bisco’s Z-Prime Plus, then applying the bonding agent of choice to prep, followed by dual-cure resin cement.
- Zirconia crowns are comfortable for patients, as they do not transmit hot and cold in the same way as conventional PFMs.
Disadvantages of Having a Zirconia Crown?
The disadvantages of zirconia crowns are minimal.
The toughness of the material has raised some concerns about friction against the tooth root and wearing down opposing teeth. Frequent checks, however, help to reduce any possible risks to opposing teeth.