fundamentals of color (may 3rd lecture)

Question 1

hue refers to

Answer 1

true color

Question 2

most important factor when matching teeth and crown

Answer 2

VALUE

Question 3

value defintino

Answer 3

intensity or brightness

Question 4

black and white chroma and hue?

Answer 4

none – ALL VALUE

Question 5

highest value

Answer 5

white

lowest - black

Question 6

chroma deals with

Answer 6

intensity -saturation

most - would be black

Question 7

spectral reflectance

Answer 7

what you see is what light reflects off the tooth

different lights reflecting

Question 8

metamerism

Answer 8

two different objects will have same color appearance under lights

we have materials that are same color but since not same exact material (as tooth structure) light can reflect differently

as light sources change – color can change

need multiple different light sources or under a full spectrum light

Question 9

consider what in viewing conditions

Answer 9

1. lighting
2. matamerism
3. background

Question 10

do we see object itself?

Answer 10

no - we see the light that bounces off of it

- why we worry about background too

Question 11

major drawbacks in shade-matching

Answer 11

1. observer -
2. viewing conditins
3. poor commnication with technician
4. commericial shade guides

Question 12

Vitapan 3d- master color system in tooth color space uses?

Answer 12

attempts to address the need for shades with high and low values

Question 13

steps in color matching accorfing to the vitapan

Answer 13

1. step 1 - value (lihgt to dark)
2. step 2 - chroma (diluted or saturated)
3. step 3 - hue (neutral, more yellow, or more red)

Question 14

assess value by?

Answer 14

squinitng

Question 15

patients mouth where when shade matching

Answer 15

at eye-level

Question 16

time to take for shade matching

Answer 16

no more than 5 seconds per

and at the beginning

Question 17

use what for chroma comparison

Answer 17

canines

Question 18

hold shade guide where?

Answer 18

in same plane - no above or below but next to

Question 19

increase value?

Answer 19

IMPOSSIBLE

Question 20

decrease value

Answer 20

with staining

complementary hue like yellow shade, use violet

Question 21

lower chroma? vs higher chroma

Answer 21

easier to raise the chroma - stain

hard to lower the chroma (clear glaze addition)

Question 22

shape and surface texture affecting the appearance in color

Answer 22

YES