Dental Crown: A dental restoration otherwise known as a “cap" which is a covering that fits over the tooth.
Some of the indications for a crown are:
1. After root canal, teeth tend to be brittle like glass and are more prone to fractures. Crowns protect from this kind of damage
2. A filled tooth with more filling than its own structure and can no longer support the filling.
3. Extensive damage by decay.
4. Discoloration and Compromised aesthetics.
5. Fractured, Chipped teeth.
6. On supporting adjacent teeth of a bridge to replace missing teeth in order to support the replacement teeth.
7. Discolorations and compromised esthetics.
8. Malformed teeth in Genetic disorders like Amelogenesis Imperfecta or Dentinogenesis Imperfecta
9. Severe Attrition, Abrasion and Sensitivity.
10. Malpositioned and misaligned teeth with crowding/ spacing.
11. As the Implant super structure
Crowns strengthen and protect the remaining tooth structure and can improve the appearance of the teeth.
Types of Dental Crowns:
Crowns can be made from different materials, which include the all-metal crown, the full porcelain crown, and the porcelain fused-to-metal crown.
The all metal crowns may be further classified as per the metal used, i.e. ni-cr, co-cr, gold, silver palladium alloys, etc.
In recent years there have been several developments in the ceramics used for crowns. These can be classified as:
1. Traditional fused porcelain on metal crowns (PFMs)
2. Pressed ceramic crowns
3. Milled ceramic crowns
4. Cast ceramic crowns
5. Reinforced crowns
6. Ceramic resin bonded crowns.
The dentist can recommend which type is more appropriate, depending upon the strength requirements and aesthetic concerns of the tooth involved.
Fitting a crown requires at least 2 appointments. During your first visit, the tooth is prepared for the crown, an impression or mould is made of the tooth, and a temporary crown is placed over the prepared tooth. At the subsequent visit, the temporary crown is removed and the final crown is fitted, adjusted and cemented into place.
After cementation, comes the maintenance and care of the prosthesis. This is much more the responsibility of the patient rather than the dentist. Patient must follow a strict oral hygiene routine and go for regular 6 monthly checkup to the dentist who not only checks for the integrity of the margins of the crown but also the health and status of surrounding periodontium as well as the adjacent teeth.
Without or in spite of all this care, complications can and do occur. Recognizing these helps their resolution at the earliest. Failure of root canal treatment, recession of gingival margin, adjacent tooth decay, fracture of supporting crown, fracture of artificial crown are just a few of these.
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