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2. Crown (dental restoration) - Wikipedia

   en.wikipedia.org/wiki/Crown_(dental_restoration)

   For gold alloys there should be 1.5mm clearance, whilst metal-ceramic crowns and full ceramic crowns require 2.0 mm. The occlusal clearance should follow the natural outline of the tooth; otherwise there may be areas of the restorations where the material may be too thin.

3. Crown (tooth) - Wikipedia

   en.wikipedia.org/wiki/Crown_(tooth)

   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.

4. Crown lengthening - Wikipedia

   en.wikipedia.org/wiki/Crown_lengthening

   Crown lengthening is done for functional and/or esthetic reasons. Functionally, crown lengthening is used to: 1) increase retention and resistance when placing a fabricated dental crown, [2] 2) provide access to subgingival caries, 3) access accidental tooth perforations, and 4) access external root resorption.

5. Post and core - Wikipedia

   en.wikipedia.org/wiki/Post_and_core

   The post does not play any role in reinforcing or supporting the tooth and can in fact make it more likely to fracture at the root. [3] When deciding whether or not a tooth requires a post and core crown rather than a conventional crown, the following must be established: [4] Presence of an adequate ferrule (coronal tooth structure)

6. Root canal treatment - Wikipedia

   en.wikipedia.org/wiki/Root_canal_treatment

   Anterior teeth typically do not require full coverage restorations after a root canal procedure, unless there is extensive tooth loss from decay or for esthetics or unusual occlusion. Placement of a crown or cusp-protecting cast gold covering is recommended also because these have the best ability to seal the treated tooth.

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