Colour Theory Basics
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Questions and Answers

What is the dimension of colour that refers to the lightness or darkness of a colour?

  • Translucency
  • Hue
  • Chroma
  • Value (correct)

    • What is the term for the variation in strength of the same colour?

  • Iridescence
  • Hue
  • Value
  • Chroma (correct)

    • What is the term for the attribute by which an object is judged to appear red, orange, yellow, etc.?

  • Chroma
  • Translucency
  • Value
  • Hue (correct)

    • What is the term for the degree to which an object scatters light upon transmission?

    <p>Translucency</p> Signup and view all the answers

    What is the term for the rainbow-like effect caused by the diffraction of light?

    <p>Iridescence</p> Signup and view all the answers

    What happens to the chroma of a colour as it moves closer to the achromatic axis?

    <p>It decreases</p> Signup and view all the answers

    What is the result of increasing the value of a tooth through bleaching?

    <p>It becomes lighter</p> Signup and view all the answers

    What is the term for the colours found on a basic colour wheel or a simple box of crayons?

    <p>Hues</p> Signup and view all the answers

    What is the most common colour deficiency in the population?

    <p>Deuteranomaly</p> Signup and view all the answers

    What is the term for an individual lacking all three types of cones?

    <p>Monochromacy</p> Signup and view all the answers

    What is chromatic induction?

    <p>An illusory sensation of colour created without direct stimulation of the corresponding cones</p> Signup and view all the answers

    What is the basis for the classification of coloured objects in dentistry?

    <p>Munsell’s colour system</p> Signup and view all the answers

    What occurs when an object's colour shifts towards the complementary colour of its surroundings?

    <p>Simultaneous colour contrast</p> Signup and view all the answers

    What enables the distinction and differentiation among different colours?

    <p>Hue</p> Signup and view all the answers

    What is the term used to describe the phenomenon where a restorative material appears to take on the colour of the tooth?

    <p>Blending effect</p> Signup and view all the answers

    What is the term for someone lacking blue vision?

    <p>Tritanomaly</p> Signup and view all the answers

    What is the three-dimensional model devised by Alfred H. Munsell?

    <p>Munsell’s colour system</p> Signup and view all the answers

    What is the result of retinal fatigue when staring at a solid colour for approximately 30 seconds or more?

    <p>Complementary afterimage</p> Signup and view all the answers

    What is the term used to describe the incorrect reference to the blending effect in the dental literature?

    <p>Chameleon effect</p> Signup and view all the answers

    What is the condition where colour vision is distorted?

    <p>Colour vision deficiency</p> Signup and view all the answers

    What is the term for the arrangement of colours in an orderly fashion?

    <p>Colour dimensions</p> Signup and view all the answers

    What occurs when the perceived difference between an object's colour and its surrounding is reduced?

    <p>Chromatic assimilation</p> Signup and view all the answers

    What is the term used to describe the phenomenon where two objects of the same colour appear to have a colour difference when placed on different coloured backgrounds?

    <p>Chromatic induction</p> Signup and view all the answers

    What is the result of chromatic induction on the perception of two objects of the same colour?

    <p>They appear to have a different colour</p> Signup and view all the answers

    Study Notes

    Colour Dimensions

    • Colour dimensions are the attributes used to judge an object's appearance, such as red, orange, yellow, green, blue, and purple.
    • These colours are found on a basic colour wheel or a simple box of crayons and are placed on a continuous, circular scale.

    Hue

    • Hue is the attribute that enables the distinction and differentiation among different colours.
    • Hue is judged by the colour's appearance, such as red, orange, yellow, green, blue, and purple.

    Value

    • Value refers to the lightness of a colour.
    • It is the achromatic vertical scale from black to white, representing all shades of gray.
    • Value is usually communicated in terms of lighter or darker.

    Chroma

    • Chroma is related to the variation in strength of the same colour.
    • The further away from the achromatic vertical axis, the higher the chroma (stronger, more intense).
    • The closer the colour is to the achromatic (value) axis, the lower the chroma (paler, weaker).
    • Chroma is often described as more chromatic or less chromatic.

    Munsell Colour System

    • The Munsell colour system is a three-dimensional model that forms the basis for the classification of coloured objects in the three dimensions: hue, value, and chroma.
    • The system was devised by American artist Alfred H. Munsell in 1898.

    Other Optical Properties

    • Translucency is the degree to which an object scatters light upon transmission, resulting in an appearance between complete opacity and complete transparency.
    • Iridescence is a rainbow-like effect caused by the diffraction of light that changes according to the angle from which it is viewed or the angle of incidence of the light source.
    • Chromatic induction is an illusory sensation of colour created when two objects of the same colour are surrounded by different coloured backgrounds.
    • Chromatic induction can generate either a contrast effect or an assimilation effect.
    • Blending effect is a perceptual phenomenon where a restorative material (object) takes on the colour of the tooth (background/surround) and appears more similar combined than when viewed in isolation.

    Colour Perception

    • Colour is interpreted by the brain after the neural signals are transported by the optic nerve.
    • There are three types of cones in the retina that are sensitive to different wavelengths of light: blue, green, and red.
    • The blue cones are most responsive to short wavelengths, while the green and red cones are most responsive to medium and longer wavelengths, respectively.

    Colour Deficiency

    • Colour vision deficiency is a weakness or absence in one or more of the three types of cones.
    • Individuals with colour deficiencies still see colour, but their colour vision is distorted.
    • The most common colour deficiency is an individual with a partial green defect known as deuteranomaly.
    • Colour deficiency poses a challenge for the clinician when performing visual shade matching.
    • Popular general tests to check colour vision are the Ishihara test and the Farnsworth–Munsell test.

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    Colour and Shade Matching in Restorative Dentistry - Copy.pptx

    Description

    Learn about the fundamental dimensions of colour, including hue and value, and how they are represented on a colour wheel and scale.

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