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In dentistry, a crown or a dental cap is a type of dental restoration that completely caps or encircles a tooth or dental implant. A crown may be needed when a large dental cavity threatens the health of a tooth. Some dentists will also finish root canal treatment by covering the exposed tooth with a crown.
If porcelain is to be applied to the gold crown, an additional minimum of 1 mm of tooth structure needs to be removed to allow for a sufficient thickness of the porcelain to be applied, thus bringing the total tooth reduction to minimally 1.5 mm. For porcelain or ceramic crowns the amount of tooth reduction is 2 mm. For metal, it is 1 mm.
Pivot tooth with a ferrule. The pivot tooth [1] [2] is a fixed dental prosthesis used to rebuild a tooth.It is a type of crown-root foundation [], but it is an independent supplement and usually consists of a pin or peg and a full crown [3] permanently connected (i.e., without cement) and placed in the patient's oral cavity during a single visit. [4]
A crown (the dental prosthesis) is then connected to the abutment with dental cement, a small screw, or fused with the abutment as one piece during fabrication. [16]: 211–232 Dental implants, in the same way, can also be used to retain a multiple tooth dental prosthesis either in the form of a fixed bridge or removable dentures.
The crown is usually visible in the mouth after developing below the gingiva and then erupting into place. If part of the tooth gets chipped or broken, a dentist can apply an artificial crown . Artificial crowns are used most commonly to entirely cover a damaged tooth or to cover an implant.
Dental composites are also used as indirect restoration to make crowns and inlays in the laboratory. These materials are similar to those used in direct fillings and are tooth-colored. Their strength and durability is not as high as porcelain or metal restorations and they are more prone to wear and discolouration.