Color and Shade selection

Question 1

Define Hue

Answer 1

the color we perceive (i.e yellow, green, etc)

Question 2

Define chroma

Answer 2

Saturation of color (intensity: light/dark)

Question 3

Define values

Answer 3

lightness or darkness

Question 4

(T/F) Color preception changes with different light sources

Answer 4

t

Question 5

Color depends on what 3 factors

Answer 5

• Observer (subjective)
• Object (tooth)
• Light source (wavelengths)

Question 6

What does it mean that teeth are polychromatic

Answer 6

that teeth have various shade intensities (not one solid intensity)

Question 7

(Enamel/Dentin) is more opaque

Answer 7

dentin

Question 8

(Enamel/dentin) provides the color

Answer 8

dentin

Question 9

(Enamel/dentin) modifies the color

Answer 9

enamel

Question 10

(T/F) Enamel is translucent

Answer 10

t

Question 11

What are the two most common sources of light

Answer 11

• Fluroescent

- Incandescent

Question 12

incandescent light bulbs have more __(what color) wavelengths?

Answer 12

yellow

Question 13

fluroescent light blues have more __(what color) wavelengths?

Answer 13

blue

Question 14

Ideal shade selection should be done in what kind of light

Answer 14

color corrected fluorescent

Question 15

What is color adaptation

Answer 15

when original color appears less saturated until it almost looks gray

Question 16

What is metamerism

Answer 16

Object appears as a different color when viewed in a different light source

Question 17

How can we avoid metamerism with our patient

Answer 17

use many light sources to determine shade

Question 18

What should you do if the dental office does not have color corrected fluorescent lights

Answer 18

take them to a window

Question 19

At what point in the appointment should you select the shade for the patient

Answer 19

At the beginning

Question 20

Why is it important to shade select at the beginning of the appointment

Answer 20

your eyes are rested and the RD has not been placed

Question 21

The RD makes the teeth look (darker/lighter)

Answer 21

darker

Question 22

What is a mock up

Answer 22

when you polymerize resin on the tooth without bonding agent

Question 23

Does composite change color when polymerized

Answer 23

yes

Question 24

What are some factors that impact shade selection

Answer 24

• light source
• office background (neutral color for walls and chairs are best)
• Patient’s surrounding colors
• Time of day
• Distance and angle from patient
• condition of the teeth- should be clean (no plaque)

Question 25

For shade selection the primary division is based on…

Answer 25

hue

Question 26

What are the 4 primary divisions of shade selection

Answer 26

A= Reddish-brown
B=Reddish-yellow
C= Grey
D=Reddish- grey

Question 27

Within each primary division (or hue) the group increases according to __

Answer 27

chroma

Question 28

Optical characteristics of composite can be modified by

Answer 28

• Intrinsic tooth color
• Thickness of the different layers
• Surface texture and polish