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Zirconia Crowns - All You Need to Know

Published on Jul 21, 2021   -  4 min read

Abstract

Zirconia combines the advantages of strength and a life-like appearance. It can be used as dental crowns, bridges, dental implant crowns, and abutments. Please read the article to know how this marvel material helps to transform one's dental treatment.

Contents
Zirconia Crowns - All You Need to Know

What Are Dental Crowns?

A dental crown is a cap made of an artificial material used to cover all the tooth surfaces to restore its strength, function, and appearance. They are usually placed on damaged, broken, or root canal-treated teeth, and when a tooth or a few teeth are missing, joint crowns or otherwise known as a dental bridge, are used to replace them. Also, crowns can be used on top of dental implants for the same reason.

Dental crowns have been in use for many decades now. Traditionally they were made from gold alloys, nickel, or cobalt-chromium alloys. Later, tooth-colored material known as dental ceramics was added on top of these alloys to make the dental crown appear like a tooth. But the presence of metal underneath the ceramic always made it difficult to give a life-like appearance to these crowns. The opacity of the metal was always shown, and it was hard to match the translucency of the natural teeth.

In order to solve this problem, dental crowns were made out of ceramics entirely. The initial version (Lithia disilicate crowns) was esthetically superior, but they lacked the strength. There was always an issue of fracture of these crowns, and there was a show-through of discoloration of the underlying natural teeth. Also, they were not useful for bridges replacing many teeth. Then came the revolutionary material Zirconia (Zirconium oxide) in the dental arena.

What Are Zirconia Crowns?

Zirconia combines the advantages of strength and a life-like appearance. It is light as well as strong, making it an ultimate choice for dental crowns. It is also chemically inert and resistant to corrosion. Zirconia can be used as dental crowns, bridges (even for replacing all the teeth in the jaw), dental implant crowns, abutments (supporting structure for dental implants), and even as dental implants themselves.

Advantages:

1. Metal-Free - As mentioned earlier, there is no metal included in the crown, which essentially makes the mouth metal-free.

2. Precise Fit - The Zirconia crowns are custom fabricated for the particular patient’s tooth size using CAD-CAM technology. The scanned image of the patient’s tooth will be fed to the computer, and the Zirconia crown is first designed in the computer to have an accurate fit. Then the design is transferred to a computerized milling machine which mills the exact design precise to microns. This makes sure there are no problems related to gap formation and food lodgment in the crown areas.

3. Quick - Since the entire process is carried out by computer design and milling, it does not take days together to fabricate them. A crown or bridge will be ready within hours of taking the measurement, which essentially means fewer visits to the dentist.

4. Longevity - With the kind of precise fit achieved with these crowns, naturally, the lifespan of these crowns will be higher than that of their counterparts. There will be zero issues pertaining to gap formation between the crown and the tooth on which it is fitted, making them long-lasting.

5. Strength - The strength of Zirconia crowns can be equal or sometimes even more than that of the natural teeth. This makes them almost impossible to break during normal function.

6. Life-Like Appearance - In the beginning, Zirconia crowns were considered opaque and not very esthetic. But the current versions have a good amount of translucency, making them esthetically close to the natural teeth. They are also good at covering up natural stained teeth, unlike the Lithia disilicate crowns. This makes it impossible for the observer to differentiate between the natural and artificial tooth, thereby enabling the wearer to smile freely without being conscious about his or her dental crown.

7. No Greying Effect - There might be a grayish discoloration along the neck of the tooth when metal-ceramic crowns are used. This is simply due to the presence of metal, and it is harmless. But when this happens in the front teeth region, surely this will not be a pleasing sight. With the use of Zirconia crowns, this problem can be solved completely.

8. Light Weight - Sure, these metal-free crowns are much lighter than the metal crowns and metal ceramics, making them comfortable for the user. There is no feeling of “heaviness” on the teeth with these crowns.

9. No Chance of Ceramic Separation - The ceramic portion of the metal-ceramic crowns frequently separate from the underlying metal core making an unaesthetic appearance. This does not happen with Zirconia crowns, as the entire crown is made up of ceramic-related components.

Disadvantages:

1. Expensive - Zirconia crowns are usually more expensive than metal-ceramic crowns. But, considering the life span they can serve, this should not be a big factor.

2. Not Versatile - There are certain conditions where there will not be enough space to fabricate Zirconia crowns.

What Are the Types of Zirconia Crowns?

1. Regular Zirconia:

This type has a Zirconia core and regular ceramic (feldspathic) on top. This can be used in front teeth and premolars where chewing forces are moderate.

2. Monolithic:

This type is used only for back teeth crowns where limited space is available for crown placement. These crowns are unsuitable for front teeth crowns.

3. High Strength Zirconia:

This type is used for the back teeth crowns and where multiple teeth have to be replaced with a dental bridge. These types can even replace the entire set of teeth in a jaw.

4. Zirconia for Bruxers:

Bruxers are people who grind their teeth at night and have heavy biting forces. For such patents, there is a special type of Zirconia with very high strength.

5. Translucent Zirconia:

This is also a special type of Zirconia used only for the front teeth with high levels of translucency. This is especially used for young patients.

Are Zirconia Crowns Safe?

They are extremely biologically compatible and do not cause any reaction in the body. In fact, they have even been used as hip bone implants for so many years. So far, no allergy has been reported for Zirconia crowns.

How Long Can the Zirconia Crowns Last?

A well-made zirconia crown has the ability to last at least 15-20 years with good maintenance from the patient such as,

Can Existing Metal Crowns Be Replaced With Zirconia Crowns?

That is definitely possible, albeit being a difficult procedure. The existing crown has to be carefully removed by the dentist without damaging the underlying teeth and then can be replaced with a Zirconia crown.

Are Zirconia Crowns Only for the Front Teeth?

They can be used for back teeth as well. In fact, they can practically be used to replace any tooth in the jaw.

Conclusion:

The advent of this marvel material for dental crowns has led to the transformation of the way one can look after dental treatment. With so many options available in Zirconia today, the dream of a perfect smile is not very far. The amount of confidence boost one can achieve with this smile is priceless.

Frequently Asked Questions


1.

Which Crown for Front Teeth Gives the Best Look?

Though porcelain-fused-to-metal (PFM) crowns provide excellent looks, layered or translucent zirconia crowns provide on par near-natural looks with added durability that PFM crowns lack.

2.

Are Zirconia Crowns Suitable for Front Teeth?

Translucent zirconia crowns are highly suitable to mask or replace a front tooth. Their improved translucent appearance gives a near-to-natural look.

3.

Is Zirconia Crown a Top-Notch Option?

Although zirconia crowns are comparatively costlier than their counterparts, single-day fabrication, durability, and superior looks make it a top-notch option in replacing or capping a natural tooth.

4.

Do Zirconia Crowns Simulate Natural Teeth in Looks?

The older version of zirconia was opaque and did not mimic the natural tooth appearance. Later, the latest forms of translucent zirconia crowns were developed, which gave close-to-natural teeth look.

5.

Do Zirconia Crowns Fracture?

Zirconia crowns have superior strength, making them resistant to fractures, but they too are prone to chip or fracture like any other material in rare conditions due to parafunctional habits like clenching the teeth, teeth grinding or bruxism, abruptly biting onto hard items, and trauma. But with regular oral activities, they make one of the toughest crowns.

6.

What Is the Longevity of Zirconia Crowns?

Zirconia crowns are sturdier options to replace a damaged tooth. They last longer than their competitors. They last for fifteen to twenty years without compromising your smile. Although they last long, patient factors like teeth grinding, poor oral hygiene, opening a bottle with the mouth, etc., can reduce their longevity.

7.

Is Zirconia Superior to Porcelain?

- Zirconia is superior to porcelain in strength, meaning they can take higher biting loads and withstand wear and tears.
- While preparing a natural tooth (tooth size reduction) to make it receive the crown, there is a loss of more tooth material in the case of porcelain crowns, but zirconia crowns necessitate minimal tooth reduction.
- They feel less heavy than porcelain crowns.
- They do not get stained easily due to food and drinks.
- Your dentist can prepare and fix it on the same day, unlike porcelain which needs to be sent to a lab for fabrication.
- It does not cause any allergy or tissue reaction to the surrounding gum tissues.

8.

What Are the Different Types of Zirconia Crowns?

Types of zirconia crowns are:
- Solid zirconia crowns.
- High translucent zirconia crowns.
- Layered zirconia crowns.

9.

Which Type Of Zirconia Is the Best?

Solid monolithic zirconia are suitable to replace or crown back teeth that undergo frequent excessive biting forces. Layered translucent zirconia crowns are the best options in the case of front teeth as they have superior esthetics.

10.

Can Chipped Artificial Crowns Be Repaired?

Minute cracks, fractures, and chippings in artificial crowns can be repaired with composite resin bonding. However, major fractures cannot be fixed; instead, new crown fabrication will be advised.

11.

How to Reduce the Thickness of a Zirconia Crown?

Proper teeth preparation by the dentist must eliminate the need for zirconia crown reduction. However, in exceptional cases, there might be a need for thickness reduction and high point correction. These can be effectively achieved with the help of diamond cutting and polishing burs ranging from coarse to fine grits. A rubber abrasive polishing wheel will also do the job.

Last reviewed at:
21 Jul 2021  -  4 min read

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