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2. Post and core - Wikipedia

   en.wikipedia.org/wiki/Post_and_core

   The post on the left is a tapered post, the one on the right is a parallel post. In post and core fabrication, it is desirable that the post descend at least two-thirds of the length of root canal (or not less than the height of the crown) in order to provide sufficient retention.

3. Internal set theory - Wikipedia

   en.wikipedia.org/wiki/Internal_set_theory

   Internal set theory (IST) is a mathematical theory of sets developed by Edward Nelson that provides an axiomatic basis for a portion of the nonstandard analysis introduced by Abraham Robinson. Instead of adding new elements to the real numbers , Nelson's approach modifies the axiomatic foundations through syntactic enrichment.

4. General equation of heat transfer - Wikipedia

   en.wikipedia.org/wiki/General_equation_of_heat...

   For a viscous, Newtonian fluid, the governing equations for mass conservation and momentum conservation are the continuity equation and the Navier-Stokes equations: = = + where is the pressure and is the viscous stress tensor, with the components of the viscous stress tensor given by: = (+) + The energy of a unit volume of the fluid is the sum of the kinetic energy / and the internal energy ...

5. Dental abscess - Wikipedia

   en.wikipedia.org/wiki/Dental_abscess

   A dental abscess is a localized collection of pus associated with a tooth. The most common type of dental abscess is a periapical abscess, and the second most common is a periodontal abscess. In a periapical abscess, usually the origin is a bacterial infection that has accumulated in the soft, often dead, pulp of the tooth.

6. Pulp (tooth) - Wikipedia

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

   The pulp is the neurovascular bundle central to each tooth, permanent or primary.It is composed of a central pulp chamber, pulp horns, and radicular canals. The large mass of the pulp is contained within the pulp chamber, which is contained in and mimics the overall shape of the crown of the tooth. [2]

7. Tooth resorption - Wikipedia

   en.wikipedia.org/wiki/Tooth_resorption

   Internal resorption is defined by the loss of intraradicular dentin and tubular dentin from within the middle and apical thirds of the root canal(s). It may also present as an incidental, radiographic finding. Radiographically, a radiolucent area of uniform density within the root canal may be visible with well-defined borders.