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Fixed Final > Basic Principles of Dental Esthetics > Flashcards

Basic Principles of Dental Esthetics Flashcards

1
Q

Are short or long light waves more dangerous?

A

Short waves are more dangerous (such as cosmic rays)

Longer waves are not as dangerous (radio)

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2
Q

Additive colors

A

RGB
If you combine colors, you get more colors
All colors together are white

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3
Q

Subtractive colors

A

CMY
If you combine colors, you get less color
All colors together are black

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4
Q

T/F - Additive colors and Subtractive colors are the reverse of each other

A

True

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5
Q

What are the 3 dimensions of color?

A

Hue
Chroma
Value

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6
Q

Munsel sphere v. CIE

A

They are the same concepts, but different scales

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7
Q

Banana shaped region

A

Region on the CIE where teeth colors are located

It’s banana shaped

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8
Q

Hue

A

What we think of as ‘color’

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9
Q

Chroma

A

Saturation
The intensity of the color
“If you add more food coloring to water, you get more chroma”

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10
Q

Value

A

How light the color is

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11
Q

What is color temperature measured in

A

Kelvin

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12
Q

What are factors that effect color perception?

A 
The eye (rods and cones)
Color adaptation
Deceptive color perception
Metamerism
Fluorescence
Opalescence
Color blindness
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13
Q

What is the color of human teeth

A

Teeth don’t have a single uniform color

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14
Q

What site of the tooth represents color best?

A

Middle site

Incisal and cervical sites are affected by the surroundings

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15
Q

How do women’s teeth compare to men’s?

A

Women have lighter, less saturated and less reddish teeth

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16
Q

What are the ideal circumstances for shade selection

A

Neutral environment
No makeup
Rapid shade comparison and gaze at a blue card
Asses value by squinting
Rapidly scan shades to discard colors
Compare under varying conditions (wet/dry)
Check shade under different light sources
Use canines as references (highest chroma)
Check adjacent shades of teeth for variations

17
Q

If you are unable to match shades, which should you select? Why?

A

Select the lower chroma and higher value

This is because it will look lighter, and it’s easy to darken it if necessary

18
Q

T/F - Shade guides fully duplicate natural tooth color

A

False

19
Q

Why is there a lack of consistency in shade choice among dentists?

A

Duplication of choice is difficult
Natural tooth colors are not fully duplicated in shade guides
Color perception varies between individual dentists

20
Q

T/F - Bleached teeth will stay their whitest color

A

False - due to dehydration, bleached teeth will usually rebound 1/2 shade following bleaching

21
Q

Structure of enamel

A 
97% HA
Protein = amelogenin
Cells = ameloblasts
Microenvironment = sealed
Maintenance = none
22
Q

Structure of Dentin

A 
67% HA
Protein = collagen
Cells = odontoblasts
Microenvironment = moserately leaky
Maintenance = odontoblastic process
23
Q

Structure of Cementum

A 
45-50% HA
Protein = collagen
Cells = cementoblasts
Microenvironment = cells widely spaced
Microenvironment = cementocytes
24
Q

What is the mechanism of bleaching?

A 
Oxidizing agent (H-peroxide, Carbamide peroxide) diffuses and penetrates through enamel into dentin
Break down producing unstable free radicals that react with organic colored pigments within inorganic apatite crystals
Smaller and less heavily pigmented molecules are formed that reflect less color - hence creating a whitening effect
25
Q

What are the elements of esthetic composition?

A 
Dental composition (micro)
Dentofacial composition (mini)
Facial composition (macro)
26
Q

What are the vertical reference lines? Which are more reliable?

A

Bridge of nose (not reliable)
Philtrum (most reliable)
Facial midline
Dental midline

27
Q

Symmetry of the smile

A

Regularity in the arrangement of teeth

Symmetry must be introduced in the dentofacial composition to create a positive psychological response

28
Q

T/F - you want a completely symmetrical smile

A

False - some asymmetry is normal, and otherwise will look fake

29
Q

What can provide persepective and illusion?

A

Widening and narrowing
Shortening and lengthening
Contrast
Shading

30
Q

What are the components of a smile?

A 
Lip line
Smile line
Upper lip curvature
Buccal corridor
Axial alignment and Gradation
Dominance
Embrasures
Dental morphology
Gingval morphology
31
Q

Lip Line

A

High - shows lots of soft tissue
Moderate - ideal
Low - doesn’t show much teeth

32
Q

Smile line

A

Hypothetical curved line drawn along the edges of maxillary anterior teeth that has to coincide or run parallel to the curvature of the lower lip.
More pronounced in women

33
Q

Dominance

A

Centrals should be the brightest and dominate the smile

34
Q

What are the components of Embrasures?

A

Form
Symmetry
Progression

35
Q

What are the components of Dental morphology

A

Contact areas
Embrasures
Textures

36
Q

What are the components of gingival morphology?

A

Gingival tissue and racial factor
Gingival health and contour
Gingival zenith

37
Q

Diagnostic waxing

A

Process of developing intra- and interarch relationships to establish crown contours and occlusal schemes for diagnostic purposes

Fixed Final (6 decks)

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