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Operative > Test 3 > Flashcards

Test 3 Flashcards

1
Q

what decides the shape of the prep

A

the material you are going to fill it with

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2
Q

what is composite resin made out of

A

powdered glass and epoxy-like materials

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3
Q

what is the difference between amalgam and composite in the way it fits in tooth

A

composite actually binds to tooth where as amalgam just sits in the hole

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4
Q

blue light is damaging to? what is more succeptible

A

eye, younger eyes

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5
Q

the matrix phase of a composite consists of ?

A

liquid resin (dimethacrylate)

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6
Q

the dispersed phase of composite consists of ?

A

the glass rocks (filler and tints)

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7
Q

what is the third step to forming a composite, what is this

A

polymerization initiators , light

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8
Q

the coupling phase of composite consists of what

A

silanes, makes glass more bondable in tooth

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9
Q

the ability to polish a composite increases with

A

the decrease in size of filler (glass rocks)

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10
Q

what improves as the rocks get smaller

A

the resistance to wear improves

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11
Q

The mechanical and physical properties do what in proportion to the volume of filler added.

A

improve

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12
Q

what is the wavelength of the blue light and what is the minimum intensity

A

475 nm 400 mW/cm2

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13
Q

all composites do what over time and cause what

A

shrink and cause stresses

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14
Q

what is composites coefficient of thermal expansion

A

high

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15
Q

composites are not usually done past what depth without layering

A

2 mm

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16
Q

base of typical posterior composite is what depth

A

5 mm

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17
Q

what does the air inhibited layer allow for

A

allows next layer of composite to stick to the previous

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18
Q

is ratio of bonded to un-bonded walls is called

A

c- factor

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19
Q

the c factor needs to be kept ?

A

low

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20
Q

a class one prep has what c factor

A

5

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21
Q

a class two prep has what c factor

A

2

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22
Q

class three and four preps have what c factor

A

1

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23
Q

what can you never do to a composite

A

over cure it

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24
Q

how long do you hold the light on a composite, especially the bottom layer

A

40 sec

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25
Q

Must be available in sufficient number of shades and degrees of translucency. True or false (anterior or posterior)

A

True anterior

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26
Q

Capable of being readily polished to a lustrous finish. True or false (anterior or posterior)

A

True anterior

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27
Q

Color stability must be good, Should have sufficient strength to resist
the forces of occlusion True or false (anterior or posterior)

A

True anterior

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28
Q

Easy to adapt to the tooth cavity and contour to shape True or false (anterior or posterior)

A

True anterior

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29
Q

Should be strong enough to prevent bulk fracture

True or false (anterior or posterior)

A

True posterior

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30
Q

Must not be sensitive to long term marginal breakdown. Should have a low polymerization shrinkage.True or false (anterior or posterior)

A

True posterior

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31
Q

Should be wear resistant and not be too abrasive to the antagonist tooth.True or false (anterior or posterior)

A

true posterior

32
Q

Must have good radiopacity to enable the diagnosis of dental caries and overhangs on radiographs.True or false (anterior or posterior)

A

true Posterior

33
Q

Must have handling characteristics compatible with the restoration and the desires of the operator. What are two examples?True or false (anterior or posterior)

A

true posterior-high viscosity and syringes, compules

34
Q

what type of composite will we use in lab, what is it called

A

hybrid composite Esthet-x

35
Q

Fluoride is released from a composite true or false

A

false

36
Q

what color light is protective for the eyes

A

green light

37
Q

visible light falls between what two spectrums

A

uv and infrared

38
Q

short blue light has what wave length

A

400-500 nm

39
Q

what wavelengths are damaging to the retina/eyes

A

blue wavelength

40
Q

mix of different wavelengths in visible portion of electromagnetic spectrum is

A

white light

41
Q

blue light is close to what in wavelength

A

uv light

42
Q

what light is thought to be inherently white but is not inherently white

A

LED

43
Q

retinal damage from viewing bright light sources

A

photoretinitis

44
Q

occurs with use of lights with high intensity blue wavelength components

A

Blue light hazard

45
Q

potential for retinal injury due to high-­‐energy short-­‐wavelength light

A

blue light hazard

46
Q

Potential phototoxic retinal damage is found in what wavelength range

A

400-460 nm

47
Q

Long –term exposure of light, Chronic exposure to short-wavelength remains
controversial, but is known as what in elderly people

A

Mascular Degeneration

48
Q

brightness of light -quantifies amount light emitted is called

A

radiance

49
Q

light incident on a surface, that scatters and reflects

A

irradiance

50
Q

what is another component that can increase retinal damage, associated with loupes

A

magnification

51
Q

Potential LED light-induced retinal damage can come from what seven components?

A

Blue wavelength component, Magnification, High intensity and duration of use, glare reflection, age of practitioner and cataract removal

52
Q

what can humans lenses do as people age as a defense mechanism against light induced retinal damage

A

yellowing of the lens

53
Q

what are the four protective mechanisms of the eye

A

Absorption of harmful wavelength, Adjustment of the pupil size, Efficient antioxidant system, Aging-cataracts

54
Q

what can the eye do to allow protection in response to green light but not to blue light

A

they pupil can constrict

55
Q

combined use of high intensity light sources and large blue light component is a potential what in what kind of light

A

A potential hazard in LED light

56
Q

what is the best LED light? what is the worst LED light

A

Neutral LED, Extreme cool LED

57
Q

Neutral LED has a fair distribution of what

A

blue and green wavelengths

58
Q

when looking for a good LED light you want proper distribution of what wavelengths

A

400-500nm 500-600 nm

59
Q

which LED’s emit about three to four times as much energy in blue-light risk portion of the spectrum as warm-white LEDs do.

A

Cold white LED’s

60
Q

what is defined as the distance between the clinician’s eyes and the work site.

A

Working distance

61
Q

Ideal working distance is what

A

12-17 inches

62
Q

what is the most critical thing in determining proper posture

A

working distance

63
Q

size of view that you see through the magnification

A

field of view

64
Q

as magnification increases field of view does what

A

decreases

65
Q

Range over which an individual is able to obtain visual resolution, the nearest and farthest distances within which the object remains in sharp focus

A

depth of field

66
Q

Degree to which the eyes are declined as the individual views the surgical site, Greater forward and downward tip, greater risk of muscle strain

A

Declination angle

67
Q

Allows the sight lines to converge on the

object being viewed, Poor convergent angle results in eyestrain and poor visual resolution

A

Convergence Angle

68
Q

what lens do we use, no bending of light, two lenses, lower in magnification

A

Galilean

69
Q

what lens is also called prismatic because it bends light, higher magnification

A

Keplerian

70
Q

what degree of magnification is recommended for most dental applications

A

2-3.5X

71
Q

Greater magnification may be desired for what procedures

A

Oral surgery and endodontic procedures

72
Q

what are the two most important things when choosing loupes, being able to maintain what

A

neutral position and optimal performance

73
Q

what are the four types of magnification

A

Rx prescription lens, single lens loupe, stationary(6x-20x), low magnification multi-lens system(2x-5x)

74
Q

Keplerian lens is what type of magnification

A

stationary

75
Q

Galilean lens is what type of magnification

A

low magnification multi-lens system

76
Q

LED spectrum has majority of what light

A

blue and green

77
Q

incandescent spectrum has a distribution toward what light

A

red and orange (warm color)

Operative (4 decks)

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