Zirconia Crown: Advantages and Disadvantages of Zirconia Crown

A dental crown is a restoration that covers a compromised tooth. When a tooth has fractured, cracked, or broken, a crown rebuilds it to full strength and appearance. Of all the materials available today, zirconia is the strongest — and with proper care, a zirconia crown can last for decades.

Why Dental Crowns Are Needed

Crowns are typically recommended for a broken, cracked, fractured, or chipped tooth, a tooth with a large existing filling, a tooth that has recently had a root canal, or a healed dental implant. The crown procedure is usually completed in under an hour per visit under local anesthetic and improves both the look and function of the tooth.

What Is Zirconia Made Of

Zirconia is zirconium dioxide — a metal oxide with a tetragonal crystalline structure that gives it extraordinary strength. It is an all-ceramic material with no metal substructure, highly resistant to wear, and extremely difficult to crack.

Introduced to general dentistry around 2010, zirconia had already been used for years in endodontic posts and implant components. It is delivered to the lab as solid pressed blocks and milled into precise 3D crowns using CAD/CAM technology. Because there is no metal layer, there are no dark lines at the gum margin.

Restorative Uses

Zirconia is used for full-coverage crowns, multi-unit bridges, frameworks for porcelain-fused-to-zirconia restorations, and even veneers in select cases.

Three Types of Zirconia Crowns

Full-contour zirconia offers superior strength and is the best choice for heavy bite forces, bruxism, or strong canine guidance. Full-contour all-translucent zirconia is more aesthetic and well suited to areas with lower biting forces. Porcelain-fused-to-zirconia (PFZ) combines a full-contour zirconia core with a translucent porcelain layer on the facial surface — the ultimate combination of wear resistance and aesthetics.

Benefits of Zirconia Crowns

Zirconia is the strongest crown material available, making it ideal for back teeth and allowing for more conservative tooth preparation. Studies show monolithic zirconia performs as well as metal crowns over a five-year span and beyond. It is highly biocompatible, with limited cytotoxicity and a low risk of immune response. With same-day CEREC crown technology at our Aliso Viejo office, a zirconia crown can be designed, milled, and cemented in a single visit.

Zirconia vs Other Crown Materials

Compared with Emax (lithium disilicate), zirconia is stronger and more durable while Emax is more translucent and often preferred for front teeth. Compared with traditional ceramic, zirconia is much more durable, and monolithic zirconia eliminates the risk of porcelain chipping. Compared with porcelain, zirconia offers better strength and a more natural appearance. Compared with porcelain-fused-to-metal, zirconia and titanium are unique in not being recognized as foreign by the body — better biocompatibility and no metal showing through.

The Procedure

Zirconia crowns can be placed in two visits (prep plus placement) or, with in-office CEREC milling, in a single same-day crown appointment. Tooth preparation includes rounded line angles, chamfered shoulders, a 0.6 mm gingival margin depth, 1.0 mm axial walls, and 1.5 mm occlusal reduction. The crown is then cemented with a glass ionomer resin cement.

How Long Do Zirconia Crowns Last

Estimates run to about twenty years, with longevity depending heavily on home care, bite forces, and habits like grinding.

Are They Safe

Yes. Zirconium dioxide has been used in medical prosthetics since the 1960s and in dentistry since the 1990s. It is chemically unreactive and free of metal-allergy concerns.

Disadvantages

The opaque appearance of monolithic zirconia can look less natural than layered ceramics, particularly on front teeth. Its hardness raises theoretical concerns about wear on opposing teeth, though studies show feldspathic porcelain actually causes more opposing enamel wear. Zirconia is also more expensive than ceramic, metal, or traditional porcelain crowns.

FAQs

Can a root canal be performed through a zirconia crown? Yes, root canal treatment can be completed through an existing zirconia crown.

Will I wear a temporary crown during the process? A temporary crown is placed between appointments to protect the prepared tooth.

Are zirconia crowns stronger than porcelain? Yes — zirconia is the strongest dental crown material available.

What are monolithic zirconia crowns? Crowns milled from a single solid block of zirconia with no ceramic layering, providing maximum strength.