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Direct Restoration > Lecture 10 > Flashcards

Lecture 10 Flashcards

1
Q

3 Dimensions of Color:

A

Hue chroma, and value

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2
Q

Value:

A

lightness or darkness, grayscale

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3
Q

Chroma:

A

saturation of color

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4
Q

Color:

A

A phenomenon of light or visual perception that allows the differentiation of otherwise identical objects

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5
Q

T or F? The exposure of one color to different light sources can change our perception of that color.

A

T

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6
Q

What does color depend upon?

A

Observer, Object, and Light source

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7
Q

In what way is energy needed to perceive color?

A

We need light energy (wavelength) to see color

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8
Q

What provides the color to the tooth?

A

dentin

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9
Q

How does the enamel contribute to the color of the tooth?

A

modifies color, translucent

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10
Q

Which is opaque and which is translucent, bw dentin and enamel?

A

enamel: translucent, dentin: opaque

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11
Q

2 main light sources in dentistry:

A

incandescent and fluorescent

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12
Q

What color does incandescent light emit?

A

higher conc of yellow than blue and blue-green

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13
Q

What does fluorescent light emit higher amounts of?

A

blue waves

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14
Q

What is the ideal light source for choosing color shade?

A

color corrected fluorescent

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15
Q

Factors affecting how we see color:

A

color blindness, color adaption, metamerism

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16
Q

color adaption is aka:

A

negative afterimage

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17
Q

What is color adaptation?

A

Color vision dec rapidly, color bc less saturated until it appears almost gray

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18
Q

What is metamerism?

A

Color of object exposed to different light sources will be perceived differently

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19
Q

How to avoid metamerism?

A

use multiple light sources

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20
Q

Where is it good to take the pt here to select the color shade:

A

the window, this is a balanced light source

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21
Q

Shade selection:

A

beginning of appt., prior to RD isolation, under balanced lighting , mock up necessary

22
Q

Why can’t you choose color properly after RD placement?

A

teeth loose moisture and appear brighter

23
Q

What is a mock up?

A

polymerize restorative material on the tooth with no bonding agent, half the curing light time, look at under list conditions

24
Q

When is a mock up recommended?

A

always

25
Q

Factors affecting shade selection:

A

light source, office background, Pt surrounding colors, time of day, distance and angle to pt, condition of the teeth

26
Q

Will the value, chroma, or hue of a tooth change after RD placement?

A

Value

27
Q

best position to be to pt:

A

Arm length, best image on retina

28
Q

Primary division of shade guide:

A

hue

29
Q

A:

A

Reddish brown

30
Q

B:

A

reddish-yellow

31
Q

C

A

grey

32
Q

D:

A

Reddish grey

33
Q

T or F? The tooth structure can change the color of the composite.

A

T

34
Q

When will a Class III bc Class IV?

A

If it will undermine the incised edge

35
Q

Prep for Class IV:

A

bevel or remove the rest of the lesion

36
Q

When to use mechanical retention?

A

NEVER! only in lab w plastic tooth

37
Q

Facial bevel:

A

Long scalloped

38
Q

Lingual bevel:

A

short, not scalloped

39
Q

Techniques for Class iV:

A

free hand and lingual matrix

40
Q

What is the matrix we use made of?

A

silicone putty

41
Q

Reason for the facial scallop:

A

esthetics

42
Q

Why use Sof-Lex discs?

A

to roughen the tooth for better retention

43
Q

Bur for beveling:

A

flame or diamond bur

44
Q

Contact should be __ mm wide incised, gingivally:

A

1-2mm

45
Q

What type of restoration are we doing?

A

MIFL

46
Q

What type of shine do we want?

A

high shine

47
Q

How to prevent discoloration of the composite?

A

remove pencil marks and clean gloves

48
Q

What teeth will be used to make a silicone matrix?

A

7-10

49
Q

RD from here to here:

A

C to C (Tooth #8 is our tooth)

50
Q

When to remove mylar strips:

A

after curing the bonding agent, polymerize from facial, remove, cure from lingual

51
Q

Typeof matrix we are using

A

Condensation silicon matrix

52
Q

Type of Resin we are using:

A

Natural Look

Direct Restoration (23 decks)

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