* Focused Lec Quiz 3/30 Wk 3 Color Science Selection

Question 1

Steps to color matching a tooth:

Answer 1

Selection of shade in office, duplication of shade in lab

Question 2

Color is determined by:

Answer 2

light that eters eye reflected from object

Question 3

Visible light spectrum:

Answer 3

380-750nm

Question 4

Predominant colors:

Answer 4

red, green, blue

Question 5

short waelngth

Answer 5

blue

Question 6

medium wavelenght:

Answer 6

green

Question 7

Long wavlength:

Answer 7

red

Question 8

All 3 primary colors -

Answer 8

white

Question 9

Apples

Answer 9

subtract or absorb, subtractive color is reflected off, pigment subtracts white from the shade

Question 10

Types of color

Answer 10

1’, 2’ and complimentary

Question 11

Color perception depends on:

Answer 11

light source, object property, visual perception

Question 12

Fluourescent light emits:

Answer 12

blue waves

Question 13

Incandescent light emits:

Answer 13

yellow waves

Question 14

Light source of dental overhead light:

Answer 14

LED

Question 15

Color corrected light source temperature

Answer 15

5,500 ‘ K + color rendering index of 90+

Question 16

of daylight

Answer 16

6,500 ‘ K

Question 17

Light on an object can:

Answer 17

reflected, absorbed, or

Question 18

Light on an object can:

Answer 18

reflected, absorbed, or transmitted

Question 19

Rod cells:

Answer 19

increases in concentration toward the periphery

Question 20

3 cell types of cones process:

Answer 20

short, medium and long wv’s

Question 21

To compare one color to the next w accuracy

Answer 21

Mensel: Hue, vlue and chroma (1st to organized all color perceptions)

Question 22

Hue:

Answer 22

color family

Question 23

chroma:

Answer 23

color intensity

Question 24

TF? Object of different hues can be of identical value.

Answer 24

T

Question 25

Introduced delta e

Answer 25

CIE, L* (0=black, 100 = white, a* - = green, A*+ =

Question 26

Vitapan classical shade guide

Answer 26

1950's

Question 27

Introduced delta e

Answer 27

CIE, L* (0=black, 100 = white, a* - = green, A*+ = red, B* - + blue, B*+ = yellow

Question 28

Shade selection in dentistry can be done by 1 of these 2 methods:

Answer 28

visual or instrumental

Question 29

Vitapan classical shade guide, when introduced?

Answer 29

1950's

Question 30

A hue in Vitapan system:

Answer 30

yellow red

Question 31

B hue in Vitapan system:

Answer 31

yellow

Question 32

C hue in Vitapan system:

Answer 32

grey

Question 33

D hue in Vitapan system:

Answer 33

Red, yellow, grey

Question 34

How to aoid metamerism

Answer 34

select shade, confirm under different seting

Question 35

Colors of office to avoid

Answer 35

red and yellow

Question 36

Bright env, makes tooth shade look:

Answer 36

duller

Question 37

Don't take more than __s to choose shade

Answer 37

1-5s

Question 38

Modern methods to quantify color:

Answer 38

spectrophotometry, colorimeters,

Question 39

Additive:

Answer 39

light emitted directly from source (3 primary to make other color)

Question 40

How to aoid metamerism

Answer 40

select shade, confirm under different setting

Question 41

subtractive can be thought of as:

Answer 41

absorbing light energy

Question 42

subtractive can be thought of as:

Answer 42

absorbing light energy

Question 43

Colorants involved in subtractive color system:

Answer 43

pigments, dyes

Question 44

Closest to emitting the full spectrum of white light:

Answer 44

daylight, the standard

Question 45

Color rendering index (CRI)

Answer 45

How well a light source renders color, compares to standard source (northern daylight)

Question 46

Northern daylight average temperature:

Answer 46

6,500' K

Question 47

Scale of CRI:

Answer 47

0-100

Question 48

Color temperature:

Answer 48

Measure of light source color when illuminated

Question 49

Cornea, convex or concave:

Answer 49

convex

Question 50

of light sensitive receptors in eye:

Answer 50

Millions

Question 51

Center of the retina has these:

Answer 51

Cone cells

Question 52

Photopic vision:

Answer 52

Cone cells, phootreception

Question 53

Scotopic visions

Answer 53

Rod cells, low light conditions, shapes can be distinguished but not color

Question 54

How many types of cone cells in eye?

Answer 54

3

Question 55

Color quantification system:

Answer 55

Munsel

Question 56

Calculating differences in color via Munsel system, easy or hard?

Answer 56

hard

Question 57

1st shade guide:

Answer 57

Vitapan classic

Question 58

Order of shade selection in Vitapan:

Answer 58

hue, then chroma

Question 59

When looking at color for a long time:

Answer 59

color appears less saturated --> grey, chroma intensity of complimentary colors appears greater