Zahnkrone: That you should know about the dentures
Inserting a dental crown is one of the most common treatments performed by the dentist. Again and again, broken or carious teeth must be crowned. Here you will learn everything about the treatment, the different crown types and the advantages and disadvantages of a dental crown treatment.
What is a dental crown and when is it used as a dental prosthesis??
The dental crown is a form of solid denture that restores larger parts of a tooth.
A crown is placed on the remaining part of the broken tooth and glued to it.
A dental crown is used when caries or an accidental injury have led to such a profound damage to the tooth that a simple tooth filling is no longer a possible treatment. While a filling is anchored in the tooth, a crown replaces larger parts of the tooth. By replicating essential tooth parts (e.g., the cusp), the original shape of the tooth is restored, allowing for normal chewing, speech, and aesthetic appearance.
What types of dental crowns exist?
Different types of crowns can be classified according to:
- the function
- the size and extent
- the material used
- the type of anchoring to the tooth
Dental crown types: classification according to function
Crowns are used for different purposes. There are replacement crowns, protective crowns and anchoring crowns.
They are the classic crowns that are used in a large tooth defect to replace the natural tooth crown.
Protective crowns are used when the hard and solid tooth enamel has been lost on the tooth and the soft dentin underneath is to be protected. Enamel may be acidified by e.g. be etched away from drinks such as fruit juice, lemonade or fruit, or he is not properly trained (Amelogenesis imperfecta).
Anchoring crowns serve to anchor dentures. This can be a bridge in which a tooth is replaced as a whole and the two adjacent teeth are crowned as a bridge pier.
There is a special type of anchoring crowns that telescopic crown. They are used to attach a removable prosthesis to residual teeth.
A telescope crown is also under the name of double crown known and refers to a two-piece crown construction. The inner tooth crown, also called the primary crown, is firmly attached to the ground tooth stump. The secondary crown or outer crown is placed on the primary crown and holds by frictional resistance. It can be taken out again and again. The secondary crown is built into the removable prosthesis, which can thus be safely anchored to the residual teeth.
Dental crown types: classification according to size and extent
The partial crown covers, as the name implies, only a part of the tooth. The use of a partial crown is useful if the tooth is so damaged by caries that a filling is no longer sufficient, but not so much that a full crown is necessary. For example, the partial crown can only cover the occlusal surface. The transition to the inlay is fluent here.
In contrast to the partial crown, the entire natural dental crown is replaced with a full crown. It is like a cap that is applied to the underlying stump of the tooth. The full crown is designed to restore both the chewing function and to resemble the natural tooth as closely as possible.
Classification according to the material used
Which material is suitable for your crown depends on which tooth is to be replaced, how stable the crown must be and what strain it is exposed to, but also from an aesthetic point of view. You can decide for yourself which material is used.
A solid crown is mainly used in the non-visible area (e.g., molar tooth) because this type of dental crown is made of metal. It therefore differs significantly in color from the natural tooth. Because of its metallic alloy, it is also called a metal crown or, if the metal used contains gold, a gold crown. It is characterized by a particularly long shelf life and resistance to breakage.
A veneer crown is also made of metal, but partially or entirely covered with a tooth-colored layer. For this veneer of the crown is almost always used ceramic, but also plastic can be used. However, this is not as durable and discolored quickly.
This type of crown is usually used in the visible area, ie on the incisor or in the anterior area of the molars.
A full ceramic crown is also called coat crown and includes the tooth, as the name suggests, coat-shaped. This crown is made entirely of ceramic.
As ceramics are not as resistant to breakage as metals, these crowns usually need to be made slightly thicker and thus more of the tooth should be removed during the preparation in order to create enough space for the crown.
They are usually not used as a definitive prosthesis, but are very well suited as long-term temporaries. Either prefabricated blanks are used, which are adapted or it is milled an individual crown.
Classification according to the type of anchorage
Depending on how much the tooth is destroyed, the crown is attached differently to it. For heavily damaged crowns, a pin may be necessary.
Cemented or glued crowns
A pin tooth, as it is popularly referred to, is a crown that is anchored in the tooth with the aid of a pin. Pins are used when the stump of the tooth is so destroyed that it no longer provides sufficient support for the crown. Pins today consist predominantly of metal or glass fiber and are fastened by means of plastic. Before a pin can be set, the tooth must receive a root canal treatment, which is often necessary anyway with such destroyed teeth.
Treatment procedure for a dental crown
The first appointment: impression taking
During the first appointment, if it is a ceramic crown or a veneer crown, the tooth color is determined. After this color, the crown is made. Then, first under local anesthesia, by caries or an accident destroyed part of the tooth removed. After laying a build-up filling, the tooth stump is prepared for the placement of a dental crown and taken a precision impression. After this impression, the crown is finally made in a dental laboratory. For the time to completion the patient wears one provisional tooth crown. It protects the tooth and allows normal biting.
The second appointment: insertion and bonding
During a second appointment, the used by the laboratory dental crown and firmly adhered to exact passport control. It is especially important that the crown fits perfectly on the tooth stump so that the gums do not become inflamed. In addition, even smaller adjustments in terms of tooth height and shape can be made. A few weeks after the crown has been used, a routine check-up is usually done.
What are advantages and disadvantages as well as risks of a dental crown?
Advantages of a dental crown
With a crown, teeth that have been severely damaged by tooth decay can in many cases still be saved
The tooth is protected from recurrence of cavitation with a crown
Disadvantages and risks of a dental crown
The natural tooth substance must be ground. In rare cases, this can lead to damage to the tooth nerve
A poor fit may promote recurrence of caries or inflammation of the dental nerve
A crown has a limited shelf life. After a few years it has to be replaced and the tooth has to be ground a bit more. At some point it may be that a crown can no longer be properly attached and the tooth must be pulled
After the treatment: How to care for your crown correctly
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