A crown covers a tooth to improve its appearance or restore its function if it has become broken down, has a very large filling or is
cracked.
- Gold
- Metal(inside) bonded to porcelain(outside)
- All ceramic
- Composite resin
Gold Crowns are probably the best in terms of function and durability but appearance is obviously an issue and cannot be considered at the front of the mouth.
The 3 other types are tooth coloured with the new ceramic crowns being the best esthetically (particularly their appearance at the gum).
Procedure
The tooth to be crowned must first be prepared under local anaesthetic and then impressions of the preparation of the prepared tooth and opposing teeth taken . A temporary crown is usually cemented at the end of this visit and the impressions sent to a dental laboratory where the crown is fabricated. Usually about 2 weeks later the temporary crown is removed and the new crown is cemented into place.
Complex crown and bridge cases sometimes require diagnostic study casts and wax ups of the proposed crowns/bridges for the dentist and patient to assess how everything will look at the end of treatment.
Example of superior esthetics of Procera (all ceramic) crown on middle tooth.
Before treatment- Patient unhappy with poor appearance of upper front teeth.
After treatment- 6 composite resin crowns on upper front teeth
All clinical photographs on this page are of work carried out at Blackrock Dental Surgery by Tom Rodgers B.D.S.
The images shown illustrate the difference in appearance between the highly esthetic all ceramic crowns, which have a very life-like appearance and are difficult to distinguish from normal teeth, and the composite resin crowns (shown in the bottom picture), which although improving the appearance considerably, are not as life-like. Please note that these are 2 separate cases.
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before and after upper front 6 teeth were crowned with metal bonded to porcelain crowns. Fillings on other teeth were also replaced and the rest of the teeth whitened.
Bridges
Bridges are used when there are teeth missing. The teeth on either side of the space are prepared as for crowns and the crowns are linked by the bridge tooth.
Traditionally metal bonded to porcelain was mostly used for bridges but with modern ceramic bridges such as Procera and Lava are now providing a suitable alternative with superior appearance.
Teet on either side of the gap support a bridge which replaces the missing tooth
Procedure
The teeth supporting the bridge must first be prepared under local anaesthetic and then impressions of the preparation of the prepared teeth and opposing teeth taken . Temporary crowns are usually cemented at the end of this visit and the impressions sent to a dental laboratory where the bridge is fabricated. Usually about 2 weeks later the temporary crowns are removed and the bridge is cemented into place.
Complex crown and bridge cases sometimes require diagnostic study casts and wax ups of the proposed crowns/bridges for the dentist and patient to assess how everything will look at the end of treatment.
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