Light Source and Color

Question 1

4 types of light source?

Answer 1

incandescent
fluorescent
color corrected light
natural daylight

Question 2

metamerism

Answer 2

an objects color appears to vary under different lights

Question 3

incandescent

Answer 3

• emits high concentration of yellow waves

* not suitable for shade matching

Question 4

fluorescent light

Answer 4

• emits high concentration of blue waves

* not suitable for shade matching

Question 5

natural daylight

Answer 5

• closest to emiting full spectrum of white light
• used as the standard by which to judge other light sources
• QUALITY dependent on time, cloud, humidity, pollution
• best

Question 6

best type of light for shade matching?

Answer 6

northern dayligtht

Question 7

halogen appearance?

Answer 7

brighter and whiter appearance than the incandescent light

Question 8

tunsten/incandescent bulb appearance

Answer 8

produces a warm relaxed environment

*ideal for reception area

Question 9

regular fluorescent appearance?

Answer 9

creates a dead, workshop or warehouse type of light

*not a good choice for dental office

Question 10

warm fluorescent appearance?

Answer 10

the color temperature produced is the same as the color temperature of the tungsten bulb
*However, it exhibits a greenish tone

Question 11

daylight fluorescent appearance?

Answer 11

manufacturers have tried to balance the color of this light to be as close to daylight as possible
*However, actual measurements show them to have a slight greenish undertone

Question 12

daylight balanced appearance

Answer 12

commercially available, daylight-balanced fluorescent tubes

*best?

Question 13

chroma

Answer 13

from pale torich

*more chroma=more color= more rich

Question 14

hue

Answer 14

basic color of the shade

Question 15

value

Answer 15

lightness or darkness of a material

Question 16

L A B color space

Answer 16

most popular color space for measuring object colors

• L= light ot dark
• +a= red and -a=green (horizontal
• +b= yellow and -b=blue (vertical)

Question 17

of newly erupted teeth, what ts the most opaque?

Answer 17

outer layers of enamel are the most opaque

*as the top layers waear off, the underlying enamel is less opaque

Question 18

the chroma of a tooth primarily comes from?

Answer 18

dentin

Question 19

as the enamel gets thiner, what becomes more obvious?

Answer 19

dentin

Question 20

where is enamel thickest?

Answer 20

incisal edge

Question 21

where is enamel thinnest?

Answer 21

cervical area

Question 22

chroma is greatest at the cervical or incisal area?

Answer 22

cervical area

*decreases as you move towards incisal

Question 23

teenagers generally have larger?

Answer 23

pulp chambers that add a RED color

Question 24

with secondary dentin formation, the pulp chamber decreases in size and the teeth become?

Answer 24

less red with age

Question 25

older dentin or sclerotic dentin is darker and has more ___ and ___ shades

Answer 25

more green and blue shades | *has higher chroma and lower value

Question 26

young dentin is more what color?

Answer 26

red-yellow

Question 27

what is retinal fatigue?

Answer 27

color vision decreasing as you observe an object more

Question 28

how can you avoid color fatigue?

Answer 28

by viewing a pale blue or gray surface between shade matching will restore color vision

Question 29

what is VITA easyhade compact?

Answer 29

simply place handheld device on tooth and press a button for a "perfect" shade * effective, time saving * cordless * measure single shade or tooth map * rests on tooth to eliminate ambient light conditions

Question 30

vita lumin shade guide and shade tabs are?

Answer 30

handheld ways to physical compare colors yourself