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  2. Tooth enamel - Wikipedia

    en.wikipedia.org/wiki/Tooth_enamel

    Parts of a tooth, including the enamel (cross section). Tooth enamel is one of the four major tissues that make up the tooth in humans and many animals, including some species of fish. It makes up the normally visible part of the tooth, covering the crown. The other major tissues are dentin, cementum, and dental pulp.

  3. Enamel prism - Wikipedia

    en.wikipedia.org/wiki/Enamel_prism

    Enamel prism are found in rows along the tooth. Within each row, the enamel prism's long axis is generally perpendicular to the underlying ADJ amelo-dentinal junction, which is also called the dentino-enamel junction. Such is the case in both permanent and primary dentitions; the enamel prisms following the path of the ameloblasts [5].

  4. Permanent teeth - Wikipedia

    en.wikipedia.org/wiki/Permanent_teeth

    Permanent teeth or adult teeth are the second set of teeth formed in diphyodont mammals. In humans and old world simians, there are thirty-two permanent teeth, consisting of six maxillary and six mandibular molars, four maxillary and four mandibular premolars, two maxillary and two mandibular canines, four maxillary and four mandibular incisors.

  5. Prism (optics) - Wikipedia

    en.wikipedia.org/wiki/Prism_(optics)

    Prism (optics) An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.

  6. Tooth decay - Wikipedia

    en.wikipedia.org/wiki/Tooth_decay

    Medication. Paracetamol (acetaminophen), ibuprofen [6] Frequency. 3.6 billion (2016) [7] Tooth decay, also known as cavities or caries, is the breakdown of teeth due to acids produced by bacteria. [6] The cavities may be a number of different colors, from yellow to black. [1] Symptoms may include pain and difficulty eating.

  7. Human tooth development - Wikipedia

    en.wikipedia.org/wiki/Human_tooth_development

    For human teeth to have a healthy oral environment, all parts of the tooth must develop during appropriate stages of fetal development. Primary (baby) teeth start to form between the sixth and eighth week of prenatal development, and permanent teeth begin to form in the twentieth week. [1]

  8. Enamel tufts - Wikipedia

    en.wikipedia.org/wiki/Enamel_tufts

    Enamel is as brittle as glass and yet it can constantly withstand bite forces during chewing as high as 1,000 N many times a day. As such, it has been argued, that enamel tufts is an example of how nature has created a biomechanical solution to the problem of weak internal interfaces that laminate structures would otherwise have.

  9. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    Eyeglass prescription. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient. If an eye examination indicates that corrective lenses are appropriate, the ...

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