Colour

Question 1

What is colour influenced by?

Answer 1

• light source
• the subject
• the observer

Question 2

What is metamerism?

Answer 2

the ability of an object to appear different under different sources of light

Question 3

What does reflectance refer to ?

Answer 3

the way the object modifies the light

Question 4

What is the reflectance of a glossy or shiny surface?

Answer 4

specular reflection

Question 5

What is the reflectance of a dull or matte surface?

Answer 5

diffuse reflection

Question 6

What is the reflectance of an absorbent surface?

Answer 6

no reflection

Question 7

Light passes through a transparent object _________.

Answer 7

unaltered

Question 8

Light does not pass through what kinds of objects?

Answer 8

opaque

Question 9

The Munsell colour system divides colours into what categories?

Answer 9

• hue- shade
• value- contrast
• chroma- intensity

Question 10

What is the purpose of the munsell colour system?

Answer 10

gives a very precise way of defining opaque colours

Question 11

The CIELab colour system divides colour into what categories?

Answer 11

• lightness (L*)
• A (a*)
• B (b*)

Question 12

What is the benefit of the CIELab colour system?

Answer 12

• more flexibility in defining colour between different materials
• colours can be matched between inks and monitors

Question 13

The VITA shade guide is arranged in …

Answer 13

order of value

Question 14

What are the problems with dental shade guides?

Answer 14

• inflexible - limited number of shades
• the shade guide is usually made from a different material to the restoration
• material batches can differ