A dental crown is a tooth-shaped How well do dental crowns work? A crown will work just like a healthy tooth. However, crowns can sometimes come loose over time and may need to be replaced or cemented in again What types of crown materials are available? Permanent crowns can be metal, porcelain-fused-to-metal, resin, or completely ceramic. Porcelain-fused-to-metal dental crowns can be color matched to your adjacent teeth unlike the metallic crowns
All-ceramic or all-porcelain dental crowns provide the best natural color match than any other crown type and may be more suitable for people with metal allergies. All-resin dental crowns are less expensive than other crown types. However, they wear down over time and are more prone to fractures than porcelain-fused-to-metal crowns. Preparing a tooth for a crown usually requires two visits. The first step involves examining and preparing the tooth and the second visit involves placement of the permanent crown. What do dental crowns cost? Costs vary depending  on the type of crown selected
A dental crown is a tooth-shaped Why Is a Dental Crown Needed? To restore an already broken tooth or a tooth that has been severely worn down What are dental crowns? A crown is a type of dental restoration that fully cups over that portion of a tooth or dental implant that lies at and above the gum line. Why are crowns placed? Repair and strengthen damaged teeth.Improve the appearance of teeth (including color, shape and even apparent alignment)
Other terms for crowns.Dental crowns are sometimes referred to as Types of tooth capping are All-ceramic dental crowns.Porcelain-fused-to-metal (PFM) crowns.Gold (all-metal) dental crowns. The advantage of a crown.In some instances, it's conceivable that a dental filling might be placed as an alternative. A dental crown, however, offers a big advantage due to the way that it's constructed. Dental crowns are routinely made for those teeth that have broken, have had large portions destroyed by tooth decay or have had root canal treatment.

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What are Dental Crowns and Tooth Bridges?

Both crowns and most bridges are fixed prosthetic devices. Unlike removable devices such as dentures, which you can take out and clean daily, crowns and bridges are cemented onto existing teeth or implants. Tooth crowns and dental bridges are often confused. The difference between a crown and a bridge is that a tooth crown is used to repair and strengthen a damaged or decayed tooth, while a dental bridge is used to replace a missing tooth. Both of these restorations are permanently bonded to your natural tooth or teeth. These restorations are used to correct your bite and restore your teeth's strength and function, as well as give you back a beautiful, full smile if you are missing any teeth.

How are Crowns and Bridges Made?

Before either a crown or a bridge can be made, the tooth (or teeth) must be reduced in size so that the crown or bridge will fit over it properly. After reducing the tooth/teeth, your dentist will take an impression to provide an exact mold for the crown or bridge. If porcelain is to be used, your dentist will determine the correct shade for the crown or bridge to match the color of your existing teeth.
Using this impression, a dental lab then makes your crown or bridge, in the material your dentist specifies. A temporary crown or bridge will be put in place to cover the prepared tooth while the permanent crown or bridge is being made. When the permanent crown or bridge is ready, the temporary crown or bridge is removed, and the new crown or bridge is cemented over your prepared tooth or teeth.

Essentially, a bridge is a fake tooth that is fused between two dental crowns. Unlike a dental implant, crowns on either side of the tooth gap support the bridge. Bridgework begins by shaping the teeth on either side of the gap so that they can be fitted with tooth crowns. Then, an impression of both the teeth and the gap is made so that a custom bridge can be made that perfectly fits your teeth. While the custom bridge is being created, you will be fitted with a temporary bridge so that you can begin to feel what the real reparation is like.
When the permanent, custom bridge is finished, can be removed and the permanent one can be bonded to your teeth. With your bridge in place, you can once again eat the foods you like and smile with confidence, knowing that there are no gaps in your smile. If you have more than one missing tooth, then a combination of a bridge and dental implants, partial dentures, or full dentures might better serve your dental needs.

How Long do Crowns and Bridges Last?

While crowns and bridges can last a lifetime, they do sometimes come loose or fall out. The most important step you can take to ensure the longevity of your crown or bridge is to practice good oral hygiene. A bridge can lose its support if the teeth or bone holding it in place are damaged by dental disease. Keep your gums and teeth healthy by Brushing with fluoride toothpaste twice a day and flossing daily. Also see your dentist and hygienist regularly for checkups and professional cleanings.

To prevent damage to your new crown or bridge, avoid chewing hard foods, ice or other hard objects.

MORE ABOUT DENTAL CROWNS

How do Crowns Work?

A crown is a restorative that covers, or "caps," to strengthened a damaged tooth to restore it to its normal shape and size. Crown can be used to improve the tooth appearance, shape or alignment. Crowns are necessary when a tooth is generally broken down and fillings won't solve the problem. If a tooth is cracked a crown holds the tooth together to seal the cracks so the damage doesn't get worse. Crowns are also used to support large fillings when there is not enough tooth surface remaining to attach a bridge. Crowns protect weaker teeth from fracturing or restore fractured teeth and they also cover badly shaped or discolored teeth.

CHOICES IN THE MATERIAL OF CROWN

Crowns can be made in three different ways.

1. Gold crowns - Gold is very durable but obviously not as aesthetically pleasing as porcelain, which looks like your natural tooth. Gold is more durable than porcelain on chewing surfaces so it is sometimes preferable when a molar needs a crown. These alloys are generally stronger than porcelain and may be recommended for back teeth.

2. Porcelain fused-to-metal - These crowns have a metal, sometimes gold, lining inside the porcelain exterior. They are natural looking because the porcelain is on the outside and more durable than porcelain alone because of the metal lining. One caution for these types of crowns is that as the years pass and your gums start to recede, the metal lining can show as a dark line along the gum line, thus negating the aesthetic look that you first wanted to achieve.

As mentioned, because of a metal lining, though covered with porcelain, on the aesthetic zone or on the front area of the mouth, If we can avoid using them, All Ceramic or Procelain Crown would give the best aestheitc result. When placed, they usually look opaque or "flat" because they do not let light pass through like a natural tooth. There is often a tell-tail dark line next to the gum-line that is undesirable (often the darkness invades the adjacent gum tissue as an adverse reaction).

3. Composite Crown - Composite crowns provide a good "temporary" cheaper alternative to porcelain crowns for the short term. They will eventually wear down or break and you should expect to have your composite crowns replaced or "upgraded" to a porcelain or gold crown.

4. Porcelain crowns - the most natural in appearance because of their transparent properties. They are strong and durable.

The most beautiful crown for a tooth is, without question, all-porcelain or all-ceramic. With porcelain fused to metal crowns, there has to be an opaque layer put over the metal to block out its color. This makes it impossible to have a translucent restoration that mimics the translucency of natural teeth. Only with pure porcelain or pure ceramic can you have such translucency.

CHOICES IN ALL-PORCELAIN AND ALL-CERAMIC CROWNS

There are various types of all-porcelain or all-ceramic crowns. Let's explain the differences between some of them:

1.The Procera crown - Procera is a milled ceramic on the inside with a more traditional porcelain baked onto the outside. The advantage of Procera is its exceptional strength. However, the milled ceramic core is opaque white, so many cosmetic dentists feel that it isn't as natural-looking as the more translucent materials. An advantage of Procera is that it doesn't have to be bonded to the tooth but can be cemented with ordinary crown and bridge cement.

2. The Lava crown - Lava is similar to Procera, but the milled ceramic on the inside is a more translucent Zirconia, rather than an opaque white material. The Zirconia is shaded, and then the final esthetics of the crown are achieved in the baked-on outer layer. The Lava crown can also be cemented with traditional techniques. However, any crown cemented with a traditional crown and bridge cement is going to be susceptible to a compromise in the appearance if that cement line ever shows.

3. Feldspathic porcelain is the standard, traditional porcelain that is used for crowns. Many cosmetic dentists feel that this is the most beautiful porcelain.
The Empress crown - Empress is strictly speaking not a porcelain, but is more like a glass. It can be called a ceramic material. The Empress material is cast rather than baked as a feldspathic porcelain crown is. The fit of Empress is more precise than the baked feldspathic porcelain. However, the color in Empress is mostly baked on the outside. Empress can be very beautiful. For appearance's sake, some expert cosmetic dentists prefer the feldspathic porcelain, and some prefer the Empress.

4. The Cerec crown - Cerec is are also milled from a block of very hard ceramic material. What's unique about Cerec is that the crown is milled by a computer in the dentist's office rather than in a separate dental laboratory. Thus, the dentist doesn't have to send out for it to be made-it can be made on the spot. So, no second appointment is required, and no wearing of a temporary crown between appointments. Cerec is milled from a block of ceramic that is a single color, so it is generally not considered esthetic enough for demanding cosmetic dentists. A few exceptional dentists who are artists, however, are able to custom stain Cerec for front teeth so that they are truly beautiful. Some even make Cerec veneers that can be placed the same day. To be precise, Cerec is actually a technique and not a material. There are several companies that make ceramic materials for use in Cerec machines.

5.The InCeram crown - InCeram is made of a very dense and very tough aluminous porcelain. It also has excellent esthetics, but is more opaque than feldspathic porcelain. InCeram is also strong enough to be cemented with traditional dental cement.
There are other types of all-ceramic crowns. We're not going to list all of them here.

ADVANTAGES AND DISADVANTAGES OF ALL-PORCELAIN AND ALL-CERAMIC CROWNS

Let's compare all-porcelain with porcelain fused to metal.

All-porcelain is generally not as strong as porcelain fused to metal. It has to be bonded to the tooth in order to have adequate strength for oral function. The bonding technique is very demanding.
With porcelain fused to metal, the porcelain has to be opaque in order to block out the appearance of the metal underneath. They all also eventually develop an unsightly dark line at the margin where the edge of the crown meets the tooth.

Some of the all-ceramic systems that have an inner ceramic core with an outer layer of porcelain baked on require more tooth reduction. Grinding away more of the tooth is often not desirable.

Some of the ceramic materials that are very tough and fracture resistant are also quite abrasive against the opposing teeth. Of the crowns listed above, the Empress is the kindest to the teeth it chews against. There are several factors that need to go into the selection of a crown material: strength requirements, esthetic requirements, the abrasivity of the material against the opposing teeth, and the skills of the dentist.

There is not a single crown that is clearly superior for all situations. Many cosmetic dentists will have several types that they will use, each for a different situation.

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