Color and Shade selection Flashcards
Define Hue
the color we perceive (i.e yellow, green, etc)
Define chroma
Saturation of color (intensity: light/dark)
Define values
lightness or darkness
(T/F) Color preception changes with different light sources
t
Color depends on what 3 factors
- Observer (subjective)
- Object (tooth)
- Light source (wavelengths)
What does it mean that teeth are polychromatic
that teeth have various shade intensities (not one solid intensity)
(Enamel/Dentin) is more opaque
dentin
(Enamel/dentin) provides the color
dentin
(Enamel/dentin) modifies the color
enamel
(T/F) Enamel is translucent
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What are the two most common sources of light
- Fluroescent
- Incandescent
incandescent light bulbs have more __(what color) wavelengths?
yellow
fluroescent light blues have more __(what color) wavelengths?
blue
Ideal shade selection should be done in what kind of light
color corrected fluorescent
What is color adaptation
when original color appears less saturated until it almost looks gray
What is metamerism
Object appears as a different color when viewed in a different light source
How can we avoid metamerism with our patient
use many light sources to determine shade
What should you do if the dental office does not have color corrected fluorescent lights
take them to a window
At what point in the appointment should you select the shade for the patient
At the beginning
Why is it important to shade select at the beginning of the appointment
your eyes are rested and the RD has not been placed
The RD makes the teeth look (darker/lighter)
darker
What is a mock up
when you polymerize resin on the tooth without bonding agent
Does composite change color when polymerized
yes
What are some factors that impact shade selection
- 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)
For shade selection the primary division is based on…
hue
What are the 4 primary divisions of shade selection
A= Reddish-brown
B=Reddish-yellow
C= Grey
D=Reddish- grey
Within each primary division (or hue) the group increases according to __
chroma
Optical characteristics of composite can be modified by
- Intrinsic tooth color
- Thickness of the different layers
- Surface texture and polish
