The crown is a constructive device that is made to cover a “prepared” tooth. There are many different reasons, why we have to crown a tooth:
1 – A broken tooth part, where build up with dental material is not recommended
2 – To create a proper occlusion in an area
3 – To achieve a great aesthetic result
4 – To raise the bite by crowning all upper teeth or even all lower teeth as well. The reason is that in many cases teeth are completely torn apart, and the masticatory forces have an inbalanced occlusion. TMJ (Temporo Mandibular Joint) can be damaged, and in many instances surgery will be necessary.
5 – Crowns would be the anchors of a bridge. When one or more teeth are missing, and we have teeth anteriorly and posteriorly of the missing space. Then we could make a bridge, using crowns in the front and back of the missing teeth. This construction is called bridge.
The preparation for crowns and bridges is done with local anesthesia. After teeth are prepared, impressions are taken, so the dental laboratory can make the final work.
In the same appointment, temporary crowns, and temporary bridges are made, which are cemented the same day, so the patient leaves dental premises, in a better functional and aesthetical way.
Both final crowns and bridges are permanently cemented over the existing teeth, in less than two weeks from the first dental appointment.
The materials used for the crowns and bridges may vary:
1- At the past, full Yellow Gold crowns were used. Today, we do not use such crowns any more.
2- Porcelain with gold underneath is a common crown. It gives stability and a good aesthetic appearance.
3- Porcelain Jackets give an excellent aesthetic result. Their disadvantage is that they can easily brake upon exessive force
4- Lately, the Zirconium crowns are in use. Instead of having a metal behind the crown, an extremelly durable white material called zirconium is used, which is covered with porcelain.
All these methods, materials and techniques are always discussed with the patient, so that he can fully understand the advantages of each crown material and make the best decision.