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2. Crown-to-root ratio - Wikipedia

   en.wikipedia.org/wiki/Crown-to-root_ratio

   These terms can also be used to refer to the clinical sense of the words, as relative crown and relative root, by describing how much tooth remains surrounded by bone.As the inflammation associated with periodontal disease causes the bone to resorb and disappear, revealing more of the root structure, the effective crown height in relation to the effective root height is reduced and the ...

3. Crown (dental restoration) - Wikipedia

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

   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.

4. Crown lengthening - Wikipedia

   en.wikipedia.org/wiki/Crown_lengthening

   Replacement of unaesthetic crowns on the upper central teeth after undergoing crown lengthening and fabrication of new restorations. Crown lengthening is often done in conjunction with a few other expensive and time-consuming dental procedures (e.g. post and core, endodontic treatment) with the ultimate goal of saving the tooth. The prognosis ...

5. Ante's law - Wikipedia

   en.wikipedia.org/wiki/Ante's_law

   In dentistry, Ante's law is a postulate about crown-to-root ratio put forth by Irwin H. Ante [1] in a thesis paper he wrote in 1926. [2]Ante's law states that "the total periodontal membrane area of the abutment teeth must equal or exceed that of the teeth to be replaced."

6. 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)

7. 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.