unit (redirected from dental unit)

unit (u´nit)

1. a single thing.

2. a quantity assumed as a standard of measurement. Symbol U.

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Angström unit  angstrom.

atomic mass unit  (u) (amu) the unit mass equal to 112 the mass of the nuclide of carbon-12. Called also dalton.

Bethesda unit  a measure of the level of inhibitor to coagulation factor VIII; equal to the amount of inhibitor in patient plasma that will inactivate 50 per cent of factor VIII in an equal volume of normal plasma following a 2-hour incubation period.

Bodansky unit  the quantity of alkaline phosphatase that liberates 1 mg of phosphate ion from glycerol 2-phosphate in 1 hour under standard conditions.

British thermal unit  (BTU) the amount of heat necessary to raise the temperature of one pound of water one degree Fahrenheit, usually from 39°F to 40°F.

CGS unit  any unit in the centimeter-gram-second system.

CH50 unit  the amount of complement that will lyse 50 per cent of a standard preparation of sheep red blood cells coated with antisheep erythrocyte antibody.

coronary care unit  a specially designed and equipped hospital area containing a small number of private rooms, with all facilities necessary for constant observation and possible emergency treatment of patients with severe heart disease.

intensive care unit  a hospital unit in which are concentrated special equipment and skilled personnel for the care of seriously ill patients requiring immediate and continuous attention; abbreviated ICU.

International unit  (IU) a unit of biological material, as of enzymes, hormones, vitamins, etc., established by the International Conference for the Unification of Formulas.

motor unit  the unit of motor activity formed by a motor nerve cell and its many innervated muscle fibers.

SI unit  any of the units of the Système International d'Unités (International System of Units) adopted in 1960 at the Eleventh General Conference of Weights and Measures.

Somogyi unit  that amount of amylase which will liberate reducing equivalents equal to 1 mg of glucose per 30 minutes under defined conditions.

Svedberg unit  (S) a unit equal to 10-13 second used for expressing sedimentation coefficients of macromolecules.

terminal respiratory unit  the anatomical and functional unit of the lung, including a respiratory bronchiole, alveolar ducts and sacs, and alveoli.

toxic unit , toxin unit the smallest dose of a toxin which will kill a guinea pig weighing about 250 gm in three to four days.

USP unit  one used in the United States Pharmacopeia in expressing potency of drugs and other preparations.

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u·nit (ynt)

n.

1. An entity regarded as an elementary structural or functional constituent of a whole.

2. A precisely specified quantity in terms of which the magnitudes of other quantities of the same kind can be stated.

3. The quantity of a serum, drug, or other agent necessary to produce a specific effect.

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unit,

n one of the components of a whole.

unit, Ångstrom, (Å, a.u.)

n the unit of measure of wavelengths; one one-hundred-millionth of a centimeter.

unit, dental,

n 1. basically, the tooth, periodontium, and gingival unit, all of which are necessary for proper masticatory activity.
2. an article of equipment that contains an assembly of numerous items used in dental operations, such as a dental engine, operatory light, bracket, working table, saliva ejector, water supply, electric outlets, compressed air, or miscellaneous instruments. May or may not have a cuspidor.

unit, dentoperiodontal,

n the tooth and periodontium together.

unit dosing,

n a method for storing dental sealant materials and other products that lessens the risk of cross-contamination.

unit, gingival,

n the tough collagenous and epithelial covering of the neck of the tooth and the underlying periodontium.

unit, partial denture,

n the individual elements of the partial denture, each contributing some particular function.

unit, radiographic,

n a device designed to produce radiographs.

unit, radiographic, calibration,

n the determination of the kilovoltage peak (kVp) value of each autotransformer tap at various milliamperages, checking these values by means of a sphere gap or a prereading voltmeter.

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unit

1. a single thing; one segment of a whole that is made up of identical or similar segments.

2. a specifically defined amount of anything subject to measurement, as of activity, dimension, velocity, volume, or the like.

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Angstrom unit

see angstrom.

atomic mass unit

see dalton.

International unit

1. see si units.

2. a unit of enzyme activity equal to the amount of enzyme that catalyzes the conversion of one micromole of substrate or coenzyme per minute under specified conditions (temperature, pH and substrate concentration) of the assay method. Abbreviated U.

3. any of several arbitrary units that have been adopted by international bodies to express the quantities of certain vitamins (A, C, D and thiamin hydrochloride), hormones (androgen, chorionic gonadotropin, estradiol benzoate, estrone, insulin, progesterone and prolactin), and drugs (digitalis and penicillin).

SI unit

any unit of the International System of units (the metric system). See si units.

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unit 1. A general term for a single discrete entity 2. A quantity which is a standard of measurement. 3. A place where something is performed. See Accreditation unit, Allergy unit, Autologous unit, Bioequivalent allergy unit, British Thermal unit, Burst-forming unit, Central processing unit, Chest pain unit, Collective bargaining unit, Colony-forming unit, Critical care unit, Crossover unit, CSU/DSU unit, Electron unit, Fetoplacental unit, Hounsfield unit, ICU unit, International unit, Map unit, Mediational unit, MET unit, MICU, Montevideo unit, Neonatal intensive care unit, Nephelometric turbidity unit, Output unit, Relative value unit, Revive Ring/Vacuum Therapy unit, Section unit, Terminal duct lobular unit, Transciption unit.