* 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, C*inc, L*dec | 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