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NBDE II Random Facts > Operative > Flashcards

Operative Flashcards

1
Q

Initial colonizing bacteria

A

gram positive, facultative -> actinomyces viscosus, strep sanguinis

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2
Q

What material forms the hybrid layer?

A

silane

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3
Q

What is the primary photo initiator in most composite resins? What wavelength does it absorb photons primarily?

A

camphoroquinone, 470 nm

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4
Q

What is the initiator used in chemical or self-cure composites?

A

Benzoyl peroxide

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5
Q

At what pH does demineralization of hydroxyapatite enamel occur?

A

5.5

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6
Q

At what pH does the demineralization of dentin occur?

A

6.2

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7
Q

At what pH does the demineralization of hydroxyfluoroapatite occur?

A

4.5

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8
Q

What is the mechanism of action of CaOH?

A

induces dentin bridge formation within the dentin pulp complex

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9
Q

What are the 2 main functions of primer?

A
  1. infiltrate and remove water from enamel prisms, dentin tubules, and exposed collagen network
  2. form the hybrid layer
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10
Q

How is the hybrid layer formed?

A

ETCH removes smear layer, exposes collagen network, then PRIMER penetrates and allows adhesive resin to form micro tags

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11
Q

The number and diameter of dentinal tubules ___ closer to the pulp.

A

increases

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12
Q

The ___ phase decreases the strength of amalgam.

A

Gamma 2

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13
Q

How do we avoid a decrease in strength of amalgam and why does that work?

A

Condensing, which brings excess mercury to the surface of the amalgam to be removed.

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14
Q

What is a property unique to amalgam and has to do with marginal sealing?

A

Amalgam is the only restorative material that improves its marginal seal with age.

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15
Q

What is the point of trituration of amalgam?

A

Remove the oxide coating and wet each particle of the alloy with mercury

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16
Q

What are the optimal water levels of fluoride?

A

0.7-1.2 ppm (mg/L)

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17
Q

Rank tooth colored restorations in order of decreasing fluoride release:

A

GI > RMGI > compomers > composite resin

18
Q

Fracture toughness is?

A

the material’s ability to resist propagation of a crack

19
Q

How can the setting time of ZOE be accelerated?

A

add water

20
Q

Amalgam contains what metals?

A

Mercury, silver, copper, tin

21
Q

Why is zinc added to amalgam? (4)

A
  1. prevents oxidation of other metals in the alloy, (amalgam doesn’t darken)
  2. enhances mechanical properties
  3. reduces marginal fracture rate
  4. prolongs the life
22
Q

True or false: overmixing amalgam reduces its strength.

A

FALSE

23
Q

What bacteria primarily cause root caries?

A

Actinomyces viscosus

24
Q

Which bacteria is associated with dental caries?

A

Strep mutans

25
Q

which phase of amalgam is the weakest?

A

gamma 2

26
Q

What is the half life of mercury in the human body?

A

55 days

27
Q

What is the dental hand instrument formula?

A

1- width of blade
2- if present, primary cutting angle
3- length of blade
4- blade angle

28
Q

How does amalgam set up?

A

mercury reacts with silver on or in the alloy particles

29
Q

What is eburnated dentin?

A

sclerotic dentin, appears dark from extrinsic staining, is firm, is seen in older patients

30
Q

The additional resin in RMGIs compared to conventional GIs causes what disadvantage?

A

increased thermal expansion

31
Q

The most common cause of fracture at the isthmus of a class II restoration is:

A

sharp axio-pulpal line angle

32
Q

What is the most important factor of a preparation that affects the pulpal response?

A

remaining dentinal thickness (RDT)

33
Q

What polishers are good for amalgam?

A

Prophy cup + tin oxide
Abrasive-impregnated rubber points
Sof-lex disks

34
Q

Over-condensing amalgam will lead to?

A

chipping and flaking during carving

35
Q

prolonged condensation of amalgam causes?

A

decreased strength

36
Q

Silicate cements are not good for ____ restorations because _____.

A

inter proximal, easily wear

37
Q

Minimum number of flutes a carbide bur needs to be considered “finishing”?

A

12

38
Q

Strongest phase of amalgam?

A

gamma 1

39
Q

Weakest phase of amalgam?

A

gamma 2

40
Q

High noble metals have approximately what % gold?

A

40%

41
Q

What primarily determines the character of teeth?

A

Texture of enamel

NBDE II Random Facts (10 decks)

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