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N2 > Operative > Flashcards

Operative Flashcards

1
Q

Critical pH of developing cavity?

A

5.5

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2
Q

Which is least likely to predict future caries?
Amount of sugar intake
Frequency of sugar intake
Amount of caries and restorations

A

Amount of sugar intake

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3
Q

Which of the following is the earliest clinical sign of a carious lesion?

A. Radiolucency
B. Patient sensitivity
C. Change in enamel opacity
D. Rough surface texture
E.Cavitation of enamel
A

C. Change in enamel opacity

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4
Q

What is true of Strep. mutans?

  • Can live in plaque,
  • Can live on gingival
  • Can live in a child with no teeth
  • Has to live on a non-shedding surface
A

• Has to live on a non-shedding surface

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5
Q

What bacteria helps in carious process but it is not the primary inititator for caries:

A

Lactobacillus

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6
Q

fact: Lactobacillus: does not initiate caries but is part of the progression of caries

A

fact Lactobacillus: does not initiate caries but is part of the progression of caries

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7
Q

Which race has most caries in kid population?

A

hispanic

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8
Q

which tooth are involved in early childhood caries

A

centrals and molars

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9
Q

Which population has the most number of UNRESTORED caries

A

black

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10
Q

Recent survey, what kind of stats on caries?
• inc in smooth surf caries - wrong
• inc in pit/fissure caries - wrong
• smooth surf caries and pit/fissure caries is same - wrong
• inc in root caries

A

increase in root caries

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11
Q

For a lesion in enamel that has remineralized, what most likely is true?

  1. The enamel has
    smaller hydroxyapatite crystals than the surrounding enamel,
  2. The remineralized enamel is softer than
    the surrounding enamel,
  3. The remineralized enamel is darker than the surrounding enamel,
  4. The remineralized enamel is rough and cavitated
A
  1. The remineralized enamel is darker than the surrounding enamel,
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12
Q

Characteristic of a lesion that is remineralized:
black, dark, bright
black, dark, opaque
black, dark, cavitated

A

black, dark, opaque

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13
Q

In which of these cases do you start restoration:

can see on x-ray, cavitation present,
lesion ½ into enamel, cross CEJ

A

cavitation present

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14
Q

Tx of root surface caries: what kind of dentin should not be restored?

A

Eburnated dentin(Sclerotic dentin)

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15
Q

Where does fluoride work the best?
A. interproximal
B. Pit and fissure

A

interprox

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16
Q

Pit and Fissure caries is described as two cones

A

interprox: «
occlusal: AV

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17
Q

conical shaped caries w/ broad base with apex towards pulp is commonly seen in?

a. root caries
b. smooth caries
c. pit/fissure caries

A

smooth caries

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18
Q

How does caries indicator dye work

A

binds to denatured collagen

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19
Q

What type of caries detection is the Dyfoti used for?

A

Class I, II, III

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20
Q

What type of caries detection is the DaignoDent used for?

A

Class I

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21
Q

Radiographic decay most closely resemble which zone of carious enamel?

Body zone
Dark zone
translucent zone
surface zone

A

body zone

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22
Q

which one accounts for 3rd molars? DMFS / DMFT

A

DMFS

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23
Q

DMFT- who has the most F- white, blacks, Hispanic, Indians

A

white

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24
Q

which of the following acronyms is only used for kids? PI, def, DMF, OHI-S, another weird
acronym

A

def

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25
Q

Differences between 245 and 330 burs

A

length of 330: 1.5mm

length of 245: 3mm

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26
Q

Diameter of 245 bur

A

0.8mm

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27
Q

What is the correct method of excavation of deep caries?

Long bur from periphery to the center,
large bur from center to periphery,
small bur from periphery to center,
small bur from center to the periphery

A

Long bur from periphery to the center

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28
Q

Rotary hand instruments: high speed how many round per min?

____RPM

A

20k

29
Q

main difference and advantage of using GMT instead of Enamel hatchet?

a. bi-angled cutting surface
b. angle of the blade
c. push/pull action instead of

A

b. angle of the blade

30
Q

what can’t you use to bevel inlay prep?

a. enamel hatchel
b. ging marg trimmer
c. flame diamond
d. carbide

A

a. enamel hatchel

31
Q

What do u not use when beveling gingival margins

A

tapered diamond

32
Q

How do you bevel occlusal floor?

  • 13,8
  • 15,80
  • 15,95
A

• 15,80

33
Q

fact: What instrument would not be used to bevel the gingival margin of an MOD prep? Enamel Hatchet

A

fact: What instrument would not be used to bevel the gingival margin of an MOD prep? Enamel Hatchet

34
Q

Most common pulpal damage from cavity prep?

heat? etch? desiccation?

A

heat

35
Q

What would cause displacement of odontoblastic processes?

Thermal,
desiccation
mechanical
chemical

A

Thermal

36
Q

Subacute mercury poisoning symptoms

A

hair loss and Hypotonia (muscle weakness)

37
Q

Most likely for amalgam to fail? Outline cavity design or poor condensation

A

outline cavity design

38
Q

Most common location of fracture of Class II amalgam

A

isthmus

39
Q

Most common reason for failed amalgam

A

depth of isthmus

40
Q 
how far extend pulpal floor in class I amlgam cavity on primary dentition.
\_\_\_mm into dentin
A

1mm

41
Q

More corrosion in which phase of amalgam?

A

Tin-mercury phase (gamma-2)

42
Q

Zinc in Amalgam, what is used for?

A

Decreases oxidation of other elements, deoxidizer

43
Q

What type of Mercury is in the dental office? elemental or inorganic?

A

elemental

44
Q

Type of mercury most hazardous to dentist health?

methylmercury,
ethylmercury,
inorganic mercury,
elemental mercury

A

methylmercury

45
Q

What type of amalgam needs to be condensed more?

A

admix

46
Q

Material to use for best interprox contact of a CLASS II is

A

admix

47
Q

Over triturating amalgam: inc/dec setting expansion time?

A

decrease

48
Q

Placing pin in amalgam restoration: ___mm into amalgam

A

2mm

49
Q

What happens to amalgam if it is contaminated with water?

what happens to expansion and strength?

A

delayed expansion

decrease strength

50
Q

Where is it acceptable to leave unsupported enamel?

A

Class V amalgam

51
Q

What do class I & class V Ag ideal prep have in common

a. both slightly extend into dentin
b. both have flat axial & pulpal wall

A

a. both slightly extend into dentin

52
Q

T/F: Is the isthmus the same for inlay and amalgam

A

T

53
Q

How to account for mesial concavity on maxillary 1st premolar when restoring with
amalgam:

A

custom wedge

54
Q

From pt images, Which amalgam filling has the lowest Copper content?

A

One that looks

corroded

55
Q

pt presents with amalgams restorations in good shape, the dentist suggest to change
them for composites due to systemic toxicity of the amalgam what ethic principle is there or the
dentist is violating what principle:,

A

veracity

56
Q

onlay resistance/retention: ____ degrees of taper per wall

A

2 to 5

57
Q

most rigid type of gold: I/2/3/4

A

type 4

58
Q

When do use base metal apposed to gold

A

long span bridges

59
Q

Weakest part of the gold mod inlay is its

A

cement

60
Q

fact: Gold crown being cemented, which is wrong? Zinc phosphate is not an option

A

fact: Gold crown being cemented, which is wrong? Zinc phosphate is not an option

61
Q

fact: Which is not correct? resin ionomer used to cement crown

A

fact: Which is not correct? resin ionomer used to cement crown

62
Q

gold on upper tooth, lower amalgam, patient has severe pain?

A

Galvanic shock

63
Q

Isthmus of MOD prep extend over 1/3 of cusp to cusp, how to treat?

amalgam, onlay, inlay crown
>1/3 intercuspal dimension

A

onlay (b/c >1/3 intercuspal dimension)

64
Q

What is the reason the burnish gold to the margin

A

acute angle of gold margin
percent elongation for burnishing
remove unsupported enamel

65
Q

which is the only surface not beveled for an onlay?

A

pulpal

66
Q

Purpose of addition of tin and iron to metal ceramic allows:

Chemical bond
Covalent bond

A

chemical bond

67
Q

What causes most post op sensitivity in direct inlay:

A

Polymerization shrinkage

68
Q

fact: Cement for porcelain onlay HAS TO BE RESIN

A

fact: Cement for porcelain onlay HAS TO BE RESIN

69
Q

Coefficient of thermal expansion in order

A

tooth < gold < amalgam < filled resin < unfilled resin

N2 (14 decks)

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