* Focused Lec Quiz 3/30 Color Science and Dental restoration (same as above?)

Question 1

How are rays of light colored?

Answer 1

They are not

Question 2

Factors affecting color perception:

Answer 2

stimulus, receptor, interpretation

Question 3

Psychophysical perception of color:

Answer 3

receptor

Question 4

physical quantity affecting color:

Answer 4

stimulus

Question 5

psychological aspect of color perception:

Answer 5

interpretation

Question 6

Pictorial representation of radiant power emitted by a light source:

Answer 6

spectral power distribution

Question 7

Visible region of electromagnetic spectrum:

Answer 7

360-770nm

Question 8

Light source w the most to least amt of yellow:

Answer 8

warm white fluorescent, cool white fluorescent, natural light, vita-lite fluorescent

Question 9

Color at the 700nm:

Answer 9

red

Question 10

Light source w most to least blue:

Answer 10

natural, vita, cool white fl, warm white fl

Question 11

Natural light source:

Answer 11

yellow, green, red, blue, gray, near-UV white, mid-UV white

Question 12

spectral power distribution of light source affects:

Answer 12

ability to render colors “naturally”

Question 13

Are all SPD curves the same for different manufactured light sources?

Answer 13

no

Question 14

Metamerism is based on:

Answer 14

differences in spectral power distribution

Question 15

Theory of Photochemical process (Young-Helmholtz theory)

Answer 15

trichromatic color vision

Question 16

Photoreceptors, cones or rods?

Answer 16

cones

Question 17

How do cone cell differ?

Answer 17

each sensitive to a certain range of WV

Question 18

What type of light mixture is theorized to occur in the photochemical process?

Answer 18

additive mixture of lights

Question 19

3 parts of color interpretation:

Answer 19

signal pwys, visual cortex, color memory

Question 20

Hue, value, chroma, axis for each?

Answer 20

x: chroma, y: value, z: hue

Question 21

this is the vertical, achromatic axis:

Answer 21

value

Question 22

Enables differentiation bw color families:

Answer 22

hue

Question 23

Enables differentiation bw pale and strong:

Answer 23

chroma

Question 24

Most universally accepted color wheel system:

Answer 24

Munsell, non-uniform color space

Question 25

Color system, differential color measurement:

Answer 25

CIELAB

Question 26

CIELAB, uniform or non color space?

Answer 26

uniform

Question 27

What does it mean to have a uniform color space?

Answer 27

equal distances represent equally perceived color difference

does the relative change in wavelength correlate to the relative change in perception?

Question 28

Dimensional units for CIELAB:

Answer 28

L, a, b*

Question 29

Which are generally higher, perceptible or acceptable thresholds?

Answer 29

acceptable

Question 30

Bench top assessment of imperceptible, DE is:

Answer 30

<1

Question 31

Bench top assessment of perceptible, DE is:

Answer 31

> 2

Question 32

Acceptability range via intraoral assessment:

Answer 32

DE=2.75 - 3.3

Question 33

What varies the most in teeth, hue value or chroma?

Answer 33

value

Question 34

Requirements for color guide:

Answer 34

logical arrangement, adequate distribution in color space

Question 35

Main grouping in Vita Classic shade guide:

Answer 35

Hue: A to D

Question 36

What varies within each group?

Answer 36

higher N^0, Cinc, Ldec

check

Question 37

of tabs in Vitapan 3d master guide:

Answer 37

26, uniformly positioned throughout color space

Question 38

4 types of shade guides:

Answer 38

3D, Vita Classic, Chromascope, Bioform

Question 39

Shade guide least uniformly distributed in space:

Answer 39

Bioform?

Question 40

of groups for Vitapan 3d master guide::

Answer 40

5 + bleaching group

Question 41

Groups in the Vitapan 3d master guide are based on:

Answer 41

Value (hue for Vitapan Classic)

Question 42

The groups are arranged this way horizontally for Vitapan 3d master guide:

Answer 42

Hue horizontal

Question 43

How are the groups in Vitapan 3d master guide arranged vertically?

Answer 43

chroma

Question 44

2 methods of shade selection:

Answer 44

Visual, instrumental

Question 45

5 factors affecting visual shade selection:

Answer 45

light, pt position, tooth hydration, timing (daylight), sequence

Question 46

What can affect light during visual shade selection?

Answer 46

operatory colors, pt w vivid color clothing or lipstick

Question 47

Ideal distance to be from pt when choosing tooth shade;

Answer 47

25-35cm, arms length

Question 48

Shade tab positioning of colors, apical to incisal:

Answer 48

red, green, blue

Question 49

How to hold shade guide while choosing:

Answer 49

arms length, next to tooth, matches and aligned so light reflects in a similar manner off both, eye at tooth level, single trial 5-7s, neutral gray bib, different light sources, full mouth photo

Question 50

When w/in appt to test shade:

Answer 50

beginning

Question 51

Is the Vita Easyshade V more accurate or reliable?

Answer 51

reliable