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FixedPros > E3: COLOR, light, and shade!!! > Flashcards

E3: COLOR, light, and shade!!! Flashcards

1
Q

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

A

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

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2
Q

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

A

White light

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3
Q

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

A
  1. the C-R-I Color Rendering Index and 2.Color Temperature
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4
Q

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

A

100…in reference to Northern Daylight

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5
Q

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

A

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

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6
Q

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

A

NOON. full spectrum visible

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7
Q

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

A

90…Color Rendering Index

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8
Q

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

A

6500Kelvin

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9
Q

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

A

InCanDescent Light

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10
Q

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

A

Fluorescent…50-80 CRI

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11
Q

What color is the fluorescent light again?

A

BLUE

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12
Q

What are the three aspects of determining color?

A

Hue, Chroma, Value

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13
Q

What are the two systems for determining color?

A

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

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14
Q

What are the 3 primary subtractive colors?

A

Red, Yellow, Blue

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15
Q

What are the three secondary subtractive colors?

A

Green, Purple, Orange

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16
Q

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

A

black

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17
Q

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

A

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

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18
Q

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.

A

violet….red

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19
Q

What are the two words to describe Chroma?

A

Saturation and Intensity

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20
Q

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

A

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

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21
Q

Restorations TOO ____ in VALUE are EASILY detected!!!

A

HIGH in value (lighter grey/white)

22
Q

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

A

5.5—8.5

23
Q

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

A

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

24
Q

Objects of different chroma / hue can be identical _____

A

value

25
Q

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

A

C-I-E-Lab

26
Q

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

A

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

27
Q

Rods =

A

Black and White

28
Q

Cones =

A

Color

29
Q

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

A

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

30
Q

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

A

Metam-erism

31
Q

Use of the operatory light is ___ recommended.

A

NOT

32
Q

What % of males are color blind? Females?

A

8% males…0.5% females

33
Q

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

A

1.Hue 2.Chroma 3.Value

34
Q

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

A

1.VALUE 2.Chroma 3.Hue

35
Q

The overall shade must blend well with the

contralateral and ________ teeth.

A

ADJACENT!

36
Q

WHEN do we take the shade?

A

Beginning of Appointment!

37
Q

What type of cement is used for translucent crowns?

A

Resin cement

38
Q

Vita Classic Shade guide uses the _______ color system.

A

Munsell

39
Q

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

A

C-I-E-Lab

40
Q

VITA: the A range is for the colors ________

A

red-yellow

41
Q

VITA: the B range is for the colors ________

A

yellow

42
Q

VITA: the C range is for the colors ________

A

gray

43
Q

VITA: the D range is for the colors ________

A

Red-yellow-gray

44
Q

VITA: the Chroma is indicated with _______ values

A

numerical- A3 = chroma of 3

45
Q

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

A

CANINE

46
Q

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

A

LOWER (black)

47
Q

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

A

LOWER (darker)

48
Q

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

A

value

49
Q

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

A

higher (lighter)

50
Q

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

A

VALUE…dark left…light right

51
Q

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

A

M

52
Q

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

A

Determine the hue- L M or R

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