Preformed metal crown-preparation

A crown is a kind of dental restoration which completely caps or encircles a tooth or dental implant. We need crown when a large cavity threatens the ongoing health of a tooth. They are usually bonded to the tooth with the use of dental cement. They can be made from many materials, which are frequently fabricated using indirect methods. Crowns are often used to improve the strength or appearance of teeth. The most common method of crowning a tooth involves using a dental impression of a prepared tooth by a dentist to fabricate the crown outside of the mouth. The crown can then be inserted at a subsequent dental appointment. Using this indirect method of tooth restoration allows use of strong restorative materials requiring time consuming fabrication methods requiring intense heat, such as casting metal or firing porcelain which would not be possible to complete inside the mouth.A majority of patients choose to have their crown fabricated with gold, because of the expansion properties, the relatively similar material costs, and the aesthetic advantages. Computers are fastly becoming a part of crown and bridge fabrication, such as in CAD/CAM dentistry.