Dental Crowns

A dental crown ("cap" shaped like a tooth). Dental crown material can be a porcelain or metal base coated with thin ceramic layer. The crown is placed over a tooth, and restores the tooth's shape. Hereby it improves your appearance. The crown of the tooth is located above the gum line and the whole is visible. The average life span of a crown is 8-10 years. If atrophy of the gums occurs, it should be changed earlier, when it is required.



Dental Bridges

A bridge may be recommended if you're missing one or more teeth. Gaps left by missing teeth eventually cause the remaining teeth to rotate or shift into the empty spaces, resulting in a bad bite. The imbalance caused by missing teeth can also lead to gum disease and temporomandibular joint (TMJ) disorders.

Bridges are commonly used to replace one or more missing teeth. They span the space where the teeth are missing. Bridges are cemented to the natural teeth or implants surrounding the empty space. These teeth, called abutments, serve as anchors for the bridge. A replacement tooth, called a pontic, is attached to the crowns that cover the abutments. As with crowns, you have a choice of materials for bridges. Your dentist can help you decide which to use, based on the location of the missing tooth (or teeth), its function, aesthetic considerations and cost. Porcelain or ceramic bridges can be matched to the colour of your natural teeth.

Why is it necessary?

In the following cases:
• Protects/holds together the weak, cracked tooth from breaking.
• When the tooth is seriously worn or it is already cracked.
• In case of a large filling it holds the tooth together.
• If you're missing one or more teeth.


What types of crowns/bridges are available?


Permanent crowns / bridges may be the followings:

Metal ceramics: The metal is completely covered in ceramic, whereby it is very aesthetic. The advantage of the ceramic crown bounded to a metal framework is, that it is stable and firm. For the metal dental crowns gold alloy or base-metal alloy (e.g. nickel or chrome) is used. It is highly resistant to wear. The drawback is the metallic colour, which may cause grey discoloration at the neck of the tooth in the course of time.

The all-ceramic crown does not contain metal framework, therefore it is also weaker. It provides a perfectly aesthetic effect, since it has no metal framework, which can be seen though the layers of ceramic, therefore an original, tooth-coloured crown can be made. The use of all-ceramic crowns is recommended only on incisors. Contrary to the traditional crowns, all of which contain some sort of metal framework, the all-porcelain crowns do not contain metal framework at all, therefore they are more vulnerable.

Zirconia crown are custom milled from solid blocks of Zirconia and baked at extremely high temperatures so that the completed crown is pretty near unbreakable. Zirconia is 100% biocompatible. It is inert, and the body in normal case does not reject zirconia so you allergies or adverse reactions can occur in much less cases. Zirconia is virtually indestructible whereas Porcelain crowns are prone to chipping. Crowns have a lifetime of around 10 years. Zirconia should last a lifetime.

Zirconia is very tough, which is good until you consider the abrasive effect of the material against the other teeth, and onto the existing root. When the manufactures boast that their products are guaranteed for life, that again, seem like a good thing, until you realize, it's often decay underneath the crown that causes the crown to fail, not the crown itself. Zirconia has the most natural look.


How is a dental crowns/bridge made?

Usually at least two separate office visits are required to place crown / bridge. The first visit includes the examination and preparation of the teeth, and an X-ray. If it is necessary, if you have a bad tooth, root canal treatment must be performed first.
After the restorative procedure a dental impression will be taken. Using this impression, a dental lab then makes your crown or bridge, in the material, colour, shape and size your dentist specified.
Until the permanent crown / bridge is ready, the tooth will be covered with a temporary crown, which may cause sensitivity of the tooth neck. If the temporary crown or bridge is left to wear for too long polishing of the tooth may become necessary later.
During the second visit 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. Before beginning the procedure your dentist will use an anaesthetic injection, because during cementation pain may appear.


What does the durability of the crowns/bridge depend on?

In case of crowns/bridge cleaning is of primary concern. 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 a traditional tooth brush or a special dental floss and a tooth-brush, which can easily slide into the space between the gum and the crown or bridge. You may also increase the lifespan of a tooth by regular cleaning. The lifespan of a tooth depends on the crown or bridge material as well.



What needs to be done before you get a dental crown or bridge?

The intervention is preceded by a previous dental examination and a treatment plan. Before the placement of each crown or bridge, the pillar i.e. the adjacent teeth should be examined as well.
Various pre-treatments may be needed before tooth polishing. Such as root filling, built-up with a post, tooth built-up on a crown or pillar core.



What needs to be done after placement of a dental crown or bridge?

  • In connection with crown or bridge some small correction may become necessary.
  • Gradual increase of the load on the crown or bridge after installation.
  • Do not eat anything for 3 hours after cementation, and eat carefully for one day after it.
  • At the point with a more intense loading pain upon biting may appear.
  • Cleaning since the food remnants deposited under the crown or bridge may lead to tooth decays. Therefore it is important to practice thorough and regular cleaning.
  • The average life span of a crown or bridge is 8-10 years. If atrophy of the gums occurs, it should be changed earlier, when it is required. The lifespan can be increased by using the proper brushing technique.

 

If you have any unanswered question.

The dentist answers.


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