Structure of dental<unk>  In dentistry,<unk>  are a form of indirect restoration, which means they are made outside of the mouth as a single, solid piece that fits the specific size and shape of the cavity, and then cemented in place in the tooth. This is an alternative to a direct restoration, made out of composite, amalgam or glass ionomer, that is built up within the mouth.Inlays and<unk>  are used in molars or premolars, when the tooth has experienced too much damage to support a basic filling, but not so much damage that a crown is necessary. The key comparison between them is the amount and part of the tooth that they cover. An<unk> will incorporate the pits and fissures of a tooth, mainly encompassing the chewing surface between the cusps. An<unk> will involve one or more cusps being covered. If all cusps and the entire surface of the tooth is covered this is then known as a crown. Historically<unk>  will have been made from gold and this material is still commonly used today. Alternative materials such as porcelain were first described being used for<unk>  back in 1857. Due to its tooth like colour, porcelain provides better aesthetic value for the patient. In more recent years,<unk>  have increasingly been made out of ceramic materials. In 1985, the first ceramic<unk> created by a chair-side CAD-CAM device was used for a patient. More recently, in 2000, the CEREC 3 was introduced. This allows for<unk>  to be created and fitted all within one appointment. Furthermore, no impression taking is needed due to the 3D scanning capabilities of the machine.
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Fill and finish
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