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PROSTHO > 15. E > Flashcards

15. E Flashcards

1
Q

The __ of an object is determined by the light that enters the human eye. Color that is perceived is the result of a ____, the object that absorbs, transmits, reflects or scatters the light from the source, and the interpretation of the source and the result by the human visual system

A

color, light source

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2
Q

is a form of visible energy that is part of the radiant energy spectrum.

A

Light

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3
Q

_____ possesses specific wavelengths, which may be used to identify the type of energy

A

Radiant energy

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4
Q

can be described by three dimensions of physical form (length, width, and depth)

A

COLOR

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5
Q

three large bands of color (red, green, and blue) are observed in the visible light spectrum

A

COLOR MIXING

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6
Q

three large bands of color?

A

red, green, and blue

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7
Q

→ these are the primary colors of the spectrum; combine them to make all other spectral of colors

A

COLOR MIXING

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8
Q

→ efforts are being made to standardize terminology in order to ensure accuracy with regard to color language, with magenta, cyan, and yellow, using the correct names for the subtractive primary colors

A

COLOR MIXING

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9
Q

widely used in the dental literature and also used in the past to quantify color

A

MUNSELL COLOR ORDER SYSTEM

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10
Q

→ a popular method of visually describing color
→ the three attributes of color in this system are called hue,
chroma, and value

A

MUNSELL COLOR ORDER SYSTEM

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11
Q

described by Munsell as “that quality by which we distinguish one color family from another, as red from yellow, or green from blue or purple … it is the family name we apply to a group of colors”

A

HUE

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12
Q

a particular variety of a color

o the shorter the wavelength, the closer the hue is to the violet
portion of the spectrum

o the longer the wavelength, the closer it is to the red portion

A

HUE

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13
Q

True or false

there are ten hue families in the Munsell Color Order System

A

True

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14
Q

stated by Munsell as “that quality by which we distinguish a light color from a dark one”

A

VALUE

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15
Q

the relative lightness or darkness of a color or the brightness of an object

A

VALUE

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16
Q

the possible range of values used in describing the lightness or darkness of a surface in the Munsell Color System extends from zero to ten

A

VALUE

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17
Q

black is zero and white is ten with a range of grays between these end points of the scale

A

VALUE

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18
Q

that quality of color by which we distinguish a strong color from a weak one

A

CHROMA

19
Q

the degree of departure of a color sensation from that of white or gray

A

CHROMA

20
Q

*the intensity of a distinctive hue
*color intensity

A

CHROMA

21
Q

used almost exclusively for color research in dentistry around the world

A

CIELAB COLOR SYSTEM

22
Q

easy to interpret clinically, as equal distances across the CIELAB color space

A

CIELAB COLOR SYSTEM

23
Q

represent approximately uniform steps in human color perception, which improves the interpretation of color measurement

A

CIELAB COLOR SYSTEM

24
Q

the lightness variable proportional to value in the Munsell system

A

L*

25
Q

describes the achromatic character of the color

A

L*

26
Q

describes the chromatic characteristics of the color

A

a AND b*

27
Q

the process in which the color of adjacent teeth is replicated in metal-ceramic or all-ceramic crown

A

COLOR REPLICATION PROCESS

28
Q

this phase occurs in the dentist’s office, in which the information on the color and translucency of the adjacent tooth to be matched is recorded through either visual shade matching or instrumental color analysis

A

SHADE MATCHING PHASE

29
Q

_____ was the first to accurately describe the color of teeth

A

Clark

30
Q

→ these samples are compared with the natural teeth and the
closest color match is determined
→ anterior teeth may vary from posterior teeth

A

DENTAL SHADE GUIDES

31
Q

the rods and cones of the retina form the chief component of the retinal receptor complex

A

RESTRICTING LIGHT

32
Q

the rods detect only lightness and darkness, the achromatic aspects of an object (value)

A

RESTRICTING LIGHT

33
Q

the cones perceive the chromatic aspects of an object (hue and
chroma)

A

RESTRICTING LIGHT

34
Q

the cones predominate at the center of the retina, zone behind
the lens is macula lutea; wherein, a depression called fovea centralis is located, most of the cones are located

A

RESTRICTING LIGHT

35
Q

→ when light strikes an object, some wavelengths are absorbed by the object and some are reflected
→ what is commonly called “the color of an object” is actually the color of light that has been reflected

A

SURROUNDING COLORS

36
Q

→ in the dental operating room, light strikes a variety of objects in the surrounding environment and is reflected
→ even if there is a good light source present, the light can be altered into an unacceptable form by the time it reaches the mouth in which actual shade selection is being performed

A

SURROUNDING COLORS

37
Q

the color selection process should be performed when sufficient time can be devoted to identify the best color match

A

TIME OF SELECTION

38
Q

good procedure involves selecting the shade at the diagnostic appointment

A

TIME OF SELECTION

39
Q

→ having the patient seated upright and at the observer’s eye level, thus, becomes the most beneficial position for clinical shade selection

A

PATIENT POSITION

40
Q

moist teeth is best during shade selection

A

TOOTH CONDITION

41
Q

a selection is made at 3-6 feet from the oral cavity since it is representative of the conditions under which the patient’s teeth will most often be observed

A

SELECTION DISTANCE

42
Q

not accurate representations of clinical color but can be useful in showing the laboratory technician the extent of translucency and the magnitude and location of surface characteristics

A

PHOTOGRAPH

43
Q

the matching of apparent color of objects with different spectral power distributions

A

METAMERISM

44
Q

another way of saying it is when objects of different material or composition look the same under one light source but different under another

→ this is the challenge of shade matching

A

METAMERISM

PROSTHO (17 decks)

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