A dental crown is a prosthetic restoration used to preserve teeth with extensive damage. Previously, we discussed the different types of dental crowns. Today, we will focus specifically on zirconia crowns—their types, advantages, and disadvantages.
What Are Zirconia Crowns?
Zirconia crowns have become increasingly popular in dentistry in recent years. They provide patients with strong and durable dental restorations.
Because zirconium dioxide (zirconia) is available in several different chemical compositions, it can be used in a variety of applications where a combination of strength and excellent aesthetics is required.
Zirconia crowns closely resemble natural teeth, making them a popular choice among patients.
Types of Zirconia Crowns
There are several types of zirconia materials. Each has unique characteristics and advantages that influence treatment outcomes.
Monolithic (Solid) Zirconia
Monolithic zirconia is the most opaque type of zirconia.
It is generally recommended for crowns on posterior teeth. It is also a suitable option for patients who grind their teeth because of its exceptional durability.
In addition to its strength, monolithic zirconia tends to cause less wear on adjacent teeth.
Multilayered Zirconia
The concept behind multilayered zirconia is to make artificial teeth appear more natural.
Multilayered zirconia is covered with a special ceramic layer in visible areas of the tooth. However, only the visible surfaces are layered, while non-visible areas remain entirely zirconia to ensure durability. Because of this design, multilayered zirconia crowns maintain excellent longevity.
The ceramic layer makes this type of crown particularly suitable for anterior teeth. Multilayered zirconia creates a more realistic smile because it is more translucent.
Another important advantage is that the visible shade is integrated into the zirconia material itself.Older zirconia systems often relied on external staining techniques. In such cases, aggressive brushing or an acidic oral environment could gradually wear away the surface color.With multilayered zirconia, even if the superficial color layer wears down, the restoration retains its appearance because the color is built into the material.
Yarema Dental uses premium translucent multilayered zirconia manufactured by the company Amann Girrbach, which has many years of experience in the development and production of zirconia materials.
High-Translucency Zirconia
High-translucency zirconia is considered the most natural-looking of all zirconia types. Its increased translucency allows it to reflect and blend with the color of adjacent teeth.
Advantages of Zirconia Crowns
Maximum Tooth Preservation
One of the most important advantages of zirconia crowns is the minimal tooth preparation required compared with many other crown types. In many cases, less healthy tooth structure must be removed, helping preserve the natural integrity and strength of the tooth.
Precise Fit
Zirconia crowns are manufactured using computer-aided design and computer-aided manufacturing (CAD/CAM) technology. This allows for a highly accurate fit, reducing the risk of gaps or inaccuracies while improving comfort and function.
Biocompatibility
Zirconia is highly biocompatible and well tolerated by the body.
It is the same material commonly used in metal-free joint prostheses and dental implants.
Metal-Free Composition
Unlike porcelain-fused-to-metal restorations, zirconia does not require a metal substructure for strength and stability. The absence of metal is particularly beneficial for patients with metal sensitivities or allergies.
Strength and Durability
Zirconia is an exceptionally strong material. Its resistance to wear makes it highly resistant to fracture and chipping. It is particularly suitable for patients with bruxism. It is not uncommon for a zirconia crown to last 20 years or longer with proper oral hygiene and regular dental care.
Aesthetics
Translucent zirconia reflects and absorbs the color characteristics of surrounding teeth. Because it is available in a wide range of shades, it can be matched precisely to a patient’s natural dentition.
When zirconia crowns were first introduced, only opaque white frameworks were available, which limited their aesthetic appeal. As a result, they were primarily used for posterior restorations. Manufacturers quickly addressed this limitation. Modern generations of zirconia materials provide highly aesthetic restorations with translucency, light refraction, and reflective properties that often exceed patients’ expectations.
At Yarema Dental, we use multilayered translucent zirconia available in a palette of 18 different shades.
Stain Resistance
Zirconia is highly resistant to staining and discoloration compared with many other dental materials. This helps maintain the natural appearance of the restoration over time and reduces the need for replacement.
Disadvantages
Although zirconia crowns offer numerous advantages, there are several potential drawbacks that should be taken into consideration. Below are some of the disadvantages of zirconia crowns to keep in mind.
Durability
Durability is both an advantage and a disadvantage of zirconia crowns. Since zirconium dioxide bonds exceptionally well to the tooth structure and is an extremely hard material, it can be difficult to remove if additional dental treatment becomes necessary. Although such situations are relatively uncommon, they should be considered when planning treatment.
Thickness
Historically, zirconia crowns have tended to be thicker than other types of crowns, such as porcelain-fused-to-metal (PFM) crowns. The increased thickness often resulted in a slightly bulkier appearance. However, this is no longer a significant concern in many cases, as technological advancements have made it possible to fabricate thinner zirconia crowns.
Cost
Restoring teeth with zirconia crowns may be more expensive than alternative treatment options. However, the superior clinical outcomes that can be achieved with zirconia restorations generally lead to higher patient satisfaction and an increased number of patient referrals.
The higher cost is primarily associated with the advanced materials and manufacturing processes involved in producing zirconia restorations.
Wear of Opposing Teeth
Zirconia is an exceptionally strong material, and its hardness may contribute to increased wear of the teeth that come into contact with it. In some cases, zirconia crowns may cause greater wear of the opposing natural teeth over time.
Patient Sensitivity
Some patients may experience temporary tooth sensitivity after the placement of zirconia crowns. However, this sensitivity is typically mild and gradually subsides over time.
Although there are both advantages and disadvantages of zirconia crowns that should be considered, zirconia crowns have become widely recognized in modern dentistry for their ability to provide outstanding aesthetics, long-term durability, excellent biocompatibility, and optimal preservation of natural tooth structure.
This article does not replace a medical consultation. For complete and personalized information, please consult your dentist.