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  2. 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.

  3. Gear - Wikipedia

    en.wikipedia.org/wiki/Gear

    A gear [1] [2] or gearwheel [3] [4] [5] is a rotating machine part typically used to transmit rotational motion and/or torque by means of a series of teeth that engage with compatible teeth of another gear or other part. The teeth can be integral saliences or cavities machined on the part, or separate pegs inserted

  4. Temporary crown - Wikipedia

    en.wikipedia.org/wiki/Temporary_crown

    Any deficiencies in the provisional crown can be amended by the addition of more temporary crown and bridge material, or a light cured composite. [6] If a temporary crown becomes de-cemented, it is important that a dentist examine the patient as overeruption of the opposing teeth may prevent accurate fitting of the final crown. [8]

  5. Sprocket - Wikipedia

    en.wikipedia.org/wiki/Sprocket

    The final drive gear ratio can be calculated by dividing the number of teeth on the rear sprocket by the number of teeth on the counter-shaft sprocket. With respect to the stock gearing on a motorcycle, installing a smaller counter-shaft sprocket (fewer teeth), or a larger rear sprocket (more teeth), produces a lower gear ratio, which increases ...

  6. List of gear nomenclature - Wikipedia

    en.wikipedia.org/wiki/List_of_gear_nomenclature

    Tooth-to-tooth radial composite deviation (double flank) is the greatest change in center distance while the gear being tested is rotated through any angle of 360 degree/z during double flank composite action test. Tooth-to-tooth radial composite tolerance (double flank) is the permissible amount of tooth-to-tooth radial composite deviation.

  7. Crown molding - Wikipedia

    en.wikipedia.org/wiki/Crown_molding

    A compound crown molding built up out of several individual trim elements Decorative pilaster of natural cherry hardwood topped with crown molding Crown molding may be a complex build-up of multiple trim elements, in this case built-out slightly above a window with short 90-degree returns The relief on this short 90-degree return of crown molding was back-cut with a coping saw

  8. Hobbing - Wikipedia

    en.wikipedia.org/wiki/Hobbing

    Hobbing is a machining process for gear cutting, cutting splines, and cutting sprockets using a hobbing machine, a specialized milling machine.The teeth or splines of the gear are progressively cut into the material (such as a flat, cylindrical piece of metal or thermoset plastic) by a series of cuts made by a cutting tool called a hob.

  9. Roller chain - Wikipedia

    en.wikipedia.org/wiki/Roller_chain

    Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.

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