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2. Nail (fastener) - Wikipedia

   en.wikipedia.org/wiki/Nail_(fastener)

   Double-ended nail – a rare type of nail with points on both ends and the "head" in the middle for joining boards together. See this patent. Similar to a dowel nail but with a head on the shank. Double-headed (duplex, formwork, shutter, scaffold) nail – used for temporary nailing; nails can easily pulled for later disassembly

3. Dental restoration - Wikipedia

   en.wikipedia.org/wiki/Dental_restoration

   There are numerous types of precision attachments (also known as combined restorations) to aid removable prosthetic attachment to teeth, including magnets, clips, hooks, and implants which may themselves be seen as a form of dental restoration. The CEREC method is a chairside CAD/CAM restorative procedure. An optical impression of the prepared ...

4. Tooth enamel - Wikipedia

   en.wikipedia.org/wiki/Tooth_enamel

   Measuring 4–8 μm in diameter, an enamel rod, formally called an enamel prism, is a tightly packed mass of hydroxyapatite crystallites in an organized pattern. [2] In cross section, it is best compared to a keyhole, with the top, or head, oriented toward the crown of the tooth, and the bottom, or tail, oriented toward the root of the tooth.

5. Glossary of dentistry - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_dentistry

   The direction toward the back of an individual's head, as opposed to anterior, which refers to the directions toward an individual's lips. The term posterior teeth refers to premolars and molars, as opposed to incisors and canines, which are anterior teeth. [1] [5] Proximal The surfaces of teeth that normally lie adjacent to another tooth.

6. Crown (dental restoration) - Wikipedia

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

   Crown used as part of implant restoration. Crowns are indicated to: [2] [3] [4] Replace existing crowns which have failed. Restore the form, function and appearance of badly broken down, worn or fractured teeth, where other simpler forms of restorations are unsuitable or have been found to fail clinically.

7. Dental sealant - Wikipedia

   en.wikipedia.org/wiki/Dental_sealant

   Back teeth showing fissure system. Dental caries is an upset of the balance between loss and gain of minerals from a tooth surface. [3] The loss of minerals from the teeth occurs from the bacteria within the mouth, fermenting foods and producing acids, whereas the tooth gains minerals from our saliva and fluoride that is present within the mouth. [3]

8. News, Politics, Sports, Mail & Latest Headlines - AOL.com

   homepage.aol.com

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

9. Double head - Wikipedia

   en.wikipedia.org/wiki/Double_head

   Double head may refer to: Doublehead (1744–1807), one of the most feared warriors of the Cherokees during the Cherokee–American wars; Double heading, the practice of using two locomotives to pull a train; Band head § Double head, a spectral band with two heads; Polycephaly, the condition of having more than one head.