E3: COLOR, light, and shade!!!

Question 1

What is the range of the visible spectrum? What color is at the low end? What color is at the high end?

Answer 1

380-750nm…red at HIGH end (INFRAred- LONG waves) and Purple at LOW end (ULTRAviolet-short waves)

Question 2

What color light do we see when ALL the colors are placed together?

Answer 2

White light

Question 3

BIGGEST THEME OF ENTIRE LECTURE: What are the 2 factors considered when selecting a LIGHT SOURCE?

Answer 3

1. the C-R-I Color Rendering Index and 2.Color Temperature

Question 4

What is the OPTIMAL C-R-I??? What is this optimal CRI compared to?

Answer 4

100…in reference to Northern Daylight

Question 5

Morning and Evening: SHORTER wavelengths SCATTER before penetrating the atmosphere, therefore it is rich in _______ and lacks ________

Answer 5

rich in YELLOW/ORANGE(longer) and lacks blue/green (shorter)

Question 6

What is the ideal time of day for natural day light?

Answer 6

NOON. full spectrum visible

Question 7

WHOLE POINT OF LECTURE: A light source with a CRI greater than ___ is recommended for shade matching…Wait what does CRI stand for again???

Answer 7

90…Color Rendering Index

Question 8

Zoomed over-what is the Temperature of the IDEAL Northern Daylight?

Answer 8

6500Kelvin

Question 9

___________ Light - emit higher concentrations of YELLOW light waves and is not suitable for shade matching.

Answer 9

InCanDescent Light

Question 10

___________ Light - give off higher concentrations of BLUE waves. Common bulbs (CRI= 50-___) therefore not suitable for shade matching

Answer 10

Fluorescent…50-80 CRI

Question 11

What color is the fluorescent light again?

Answer 11

BLUE

Question 12

What are the three aspects of determining color?

Answer 12

Hue, Chroma, Value

Question 13

What are the two systems for determining color?

Answer 13

1.MUNSELL and 2.C-i-E-Lab

Question 14

What are the 3 primary subtractive colors?

Answer 14

Red, Yellow, Blue

Question 15

What are the three secondary subtractive colors?

Answer 15

Green, Purple, Orange

Question 16

What color occurs when all the PRIMARY subtractive colors are combined?

Answer 16

black

Question 17

What are the colors obtained from emitting light? (TV and computer)…What are the 3 PRIMARY specific colors? What are the 3 secondary?

Answer 17

Additive…Red Green Blue…secondary: Cyan, yellow, Magenta

Question 18

Munsell: The shorter the wavelength the closer the hue is to _____, longer the wavelength the closer the hue is to ___. Hues are arranged around the wheel.

Answer 18

violet….red

Question 19

What are the two words to describe Chroma?

Answer 19

Saturation and Intensity

Question 20

VALUE: _____ your eyes, dawg! What is the intensity of black in LOW value?

Answer 20

SQUINT your eyes!….LOW VALUE = BLACK. high value = White/light gray

Question 21

Restorations TOO ____ in VALUE are EASILY detected!!!

Answer 21

HIGH in value (lighter grey/white)

Question 22

What is the value range of NATURAL TEETH?? dark—>light

Answer 22

5.5—8.5

Question 23

AGAIN: A restoration too _____ in value is easily detected by an observer and a common mistake in metal-ceramic prosthodontics

Answer 23

HIGH (too light!!) Toilet Bowl White!!!

Question 24

Objects of different chroma / hue can be identical _____

Answer 24

value

Question 25

It is a better system then Munsell system because of the magnitude of perceptibility:

Answer 25

C-I-E-Lab

Question 26

What are the 3 coordinates of the C-I-E-Lab color system?

Answer 26

1.L-lightness (Value in munsell) 2.A- Chromatic characteristics of color: Red-purple/Blue-Green Axis 3.B-Chromatic characteristics of color: Yellow/purple-blue axis

Question 27

Rods =

Answer 27

Black and White

Question 28

Cones =

Answer 28

Color

Question 29

Color vision decreases RAPIDLY! Don't worry, you can restore color vision by:

Answer 29

Viewing a pale BLUE or GRAY surface between shade matching will restore color vision!! COOL!

Question 30

That COOL,tricky picture of the same shade squares under different light sources is called:

Answer 30

Metam-erism

Question 31

Use of the operatory light is ___ recommended.

Answer 31

NOT

Question 32

What % of males are color blind? Females?

Answer 32

8% males...0.5% females

Question 33

MAIN POINT OF LECTURE: What is the sequence of evaluating a color in the Munsell System?

Answer 33

1.Hue 2.Chroma 3.Value

Question 34

MAIN POINT OF LECTURE: What is the sequence of evaluating a color in the C-I-E-Lab system?

Answer 34

1.VALUE 2.Chroma 3.Hue

Question 35

The overall shade must blend well with the | contralateral and ________ teeth.

Answer 35

ADJACENT!

Question 36

WHEN do we take the shade?

Answer 36

Beginning of Appointment!

Question 37

What type of cement is used for translucent crowns?

Answer 37

Resin cement

Question 38

Vita Classic Shade guide uses the _______ color system.

Answer 38

Munsell

Question 39

The VitaPan 3D and Extended Range shade guides use the _______ color system

Answer 39

C-I-E-Lab

Question 40

VITA: the A range is for the colors ________

Answer 40

red-yellow

Question 41

VITA: the B range is for the colors ________

Answer 41

yellow

Question 42

VITA: the C range is for the colors ________

Answer 42

gray

Question 43

VITA: the D range is for the colors ________

Answer 43

Red-yellow-gray

Question 44

VITA: the Chroma is indicated with _______ values

Answer 44

numerical- A3 = chroma of 3

Question 45

***Use area of tooth highest in chroma for hue selection ( Cervical region of ______)

Answer 45

CANINE

Question 46

Squinting eyes for Value: The one that fades first has the _____ value.

Answer 46

LOWER (black)

Question 47

*** If the value of the shade tab is _____ (_____) than that of the natural teeth, a change is usually necessary!!

Answer 47

LOWER (darker)

Question 48

increasing the ______ of a restoration is not possible by means of staining.

Answer 48

value

Question 49

Don't worry if your restoration has a ______ (_____) value than the natural teeth, it can be adjusted with staining!!

Answer 49

higher (lighter)

Question 50

Vita-3D: 1st select _____..The ______ group will be on the left and the ______ on the right.

Answer 50

VALUE...dark left...light right

Question 51

Step 2 of vita-remove the 3 ___ tabs to determine chroma

Answer 51

M

Question 52

What is the 3rd step of Vita 3D? What are the options?

Answer 52

Determine the hue- L M or R