fundamentals of color (may 3rd lecture) Flashcards
hue refers to
true color
most important factor when matching teeth and crown
VALUE
value defintino
intensity or brightness
black and white chroma and hue?
none – ALL VALUE
highest value
white
lowest - black
chroma deals with
intensity -saturation
most - would be black
spectral reflectance
what you see is what light reflects off the tooth
different lights reflecting
metamerism
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
consider what in viewing conditions
- lighting
- matamerism
- background
do we see object itself?
no - we see the light that bounces off of it
- why we worry about background too
major drawbacks in shade-matching
- observer -
- viewing conditins
- poor commnication with technician
- commericial shade guides
Vitapan 3d- master color system in tooth color space uses?
attempts to address the need for shades with high and low values
steps in color matching accorfing to the vitapan
- step 1 - value (lihgt to dark)
- step 2 - chroma (diluted or saturated)
- step 3 - hue (neutral, more yellow, or more red)
assess value by?
squinitng
patients mouth where when shade matching
at eye-level
time to take for shade matching
no more than 5 seconds per
and at the beginning
use what for chroma comparison
canines
hold shade guide where?
in same plane - no above or below but next to
increase value?
IMPOSSIBLE
decrease value
with staining
complementary hue like yellow shade, use violet
lower chroma? vs higher chroma
easier to raise the chroma - stain
hard to lower the chroma (clear glaze addition)
shape and surface texture affecting the appearance in color
YES
