Knoop hardness test

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Knoop hard·ness num·ber (KHN),

a number obtained by dividing the load in kg applied to a pyramidal diamond of specific size divided by the projected area of the impression: KHN = L/A, where A= the projected area of the impression in mm2 and L = the load in kg; used for measurements of hardness of any materials, especially very hard and brittle substances such as tooth dentin and enamel.
Farlex Partner Medical Dictionary © Farlex 2012

Knoop hardness test



A test of surface hardness, using a stylus with a pyramidal diamond indenter. The long diagonal of the resulting indentation determines the hardness of the substance.
Medical Dictionary, © 2009 Farlex and Partners

Knoop hard·ness test

(knūp hahrdnĕs test)
Dental measurement to determine hardness of brittle materials; uses a diamond or rhombic indenting tool; test result provides dental clinicians with the Knoop hardness number.
Medical Dictionary for the Dental Professions © Farlex 2012