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NBDE II > Operative > Flashcards

Operative Flashcards

1
Q

What are the saliva antimicrobial properties

A

Proteins, enzymes and antibodies
Lysozymes: destroy cell walls
Lactoferrin: actively binds to iron
Lactoperoxidaze: Inactivates bacterial enzymes
Type A secretory Immunoglobulins; fight against S. mutants attacks.

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2
Q

What’s in saliva that helps remineralization

A 
Calcium
Phosphate
Potassium
fluoride ions 
Statherin
cystatins
Histatins
proline-rich proteins
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3
Q

What problems come from reduce salivary flow

A 
Prolonged pH depression
Decreased:
antibacterial effects
ions available for remi
elimination of microorganism
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4
Q

When should testing for S. mutant count should be done

A

Pt has one or more medical risk factors
pt has undergone antimicrobial therapy
pt presents with new incipient lesions
pt is undergoing orthodontic care

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5
Q

What interventions are recommended for high caries risk

A 
3 month recall, prophy and Fl application
OHI with aids 
dietary counseling
bitewings every 6-12 months
Rx dentifrice 
Xylitol gum, rinse
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6
Q

What interventions are recommended for moderate caries risk

A

4-6 month recall, prophy and FL application
reinforce OHI and diet.
Fl dentifrice and OTC rinse.

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7
Q

What are frank caries

A

caries that have progressed just into the DEJ

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8
Q

What are the zones of carious enamel

A

Surface; seems unaffected by caries.
Body; Largest zone, demineralizing phase
Dark zone; Inability to transmit polarized light
Translucent: deepest

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9
Q

What zones of carious dentin can be remineralized

A

the first three
Normal
Subtransparent
Transparent

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10
Q

What zones of carious dentin are infected and must be removed

A

Infected and Turbid

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11
Q

Initial pathway of demineralization on root caries is along the

A

Sharpey’s fibers of the cementum

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12
Q

What are the sign of rampant caries

A

Acute onset
often associated with pain
Deep and narrow presentation results in large cavitation

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13
Q

What are the seven common medication categories that reduce salivary function

A 
Anticholinergics; 
Antipsychotics
Antihistamines 
Anesthetics (Local)
Benzodiazepines
Beta-blockers
Diuretics
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14
Q

Anticholinergic examples

A

Atropine, Scopolamine, Glycopyrolate

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15
Q

Diuretic examples

A

Hydrochlorothiazide

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16
Q

Antipsychotics examples

A

Chlorpromazine

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17
Q

Beta blocker examples

A

Atenolol

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18
Q

Benzodiazepine examples

A

Alprazolam

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19
Q

Antihistamine example

A

Chlorpheniramine

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20
Q

What is the criteria for diagnosing Pit and Fissure caries

A 
FLOSS
Flakiness of enamel
Loss of translucency
Opacity
Stickiness
Softening of the base of the pit and fissure
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21
Q

O caries are better detected on what type of RG

A

Pano

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22
Q

design of a chisel

A

cutting edge makes a 90 degree angle with the plane of the blade, blade has a one sided bevel

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23
Q

Chisels are used to

A

Plane and cleave enamel

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24
Q

The Chisel family is

A 
CHAD
Chisels
Hoes 
Angle formers
Discoids and cleoids
25
Q

Design of a hatchet

A

Cutting edge is parallel with the plane of instrument, blade that ends in a cutting edge in the plane of the handle.

26
Q

Hatchet family

A

HEG
Hatchets
Excavators
Gingival marginal trimmers

27
Q

What is ultimate strength

A

Point on the stress-strain curve at which fracture occurs .

28
Q

What is percolation

A

intermittent inlet and outlet of fluid leakage that can result in marginal decay.

29
Q

What is the thermal conductivity of Tooth, ama, comp and gold

A

Tooth .002
Composite .002
Amalgam .05
Gold .7 degrees C/cm

30
Q

What is the elastic limit

A

greatest stress an object can be subjected to in which it can still return to its original dimensions.
Gold->Enamel->amalgam->composite->dentin

31
Q

What is proportionate limit

A

Stress at which the material no longer functions as elastic

32
Q

Yield point

A

point at which permanent deformation takes place

33
Q

What factors increase amalgam setting expansion

A

more free mercury
shorter trituration time
Small condensation pressure
Increased particle size

34
Q

How does Cu contribute to amalgam alloys

A

Elimination of gamma 2

decrease in creep

35
Q

What is the byproduct in amalgam that decreases marginal leakage

A

Tin sulfide

36
Q

size of fine filler particles

A

0.5 to 3 micrometers

37
Q

size of microfine filler particles

A

0.04 micrometers

38
Q

What is mycrohybrid composite

A

combo of 0.04 and .5 to 3

39
Q

What is the initiator in self cure systems and the activator

A

benzoyl peroxide and a tertiary amine

40
Q

What is the filler content of flowable composite

A

<50%by vol

41
Q

What is the filler content of condensable composites

A

> 65%

42
Q

What is the average thickness of a base

A

1-2 mm

43
Q

What i the average thickness of a cement

A

0.5 mm

44
Q

What is the thickness of a liner

A

5 microns

45
Q

What material is mostly used for final cementation of crown and bridges

A

GI

Zinc polycarboxylate

46
Q

What is ZOE composed of

A 
Zinc oxide
rosin
zinc acetate 
accelerator 
Eugenol liquid
47
Q

What is a base used for

A

provide support and thermal protection for the pulp

48
Q

CaOH base is used under

A

amalgam and composite restorations

49
Q

What bases are used under gold restorations

A

Zinc phosphate or zinc polycarboxylate

50
Q

What base is used as a direct pulp cap

A

zinc phosphate cement over CaOH

51
Q

What is a liner

A

suspension of Dycal in water

52
Q

What is a varnish

A

solution liners of resin (Copalite) in liquid

Do not use with composites

53
Q

What are factors that might precipitate rampant caries

A 
histological disadvantages
poor hygiene 
drug abuse
High-sugar diets
decreased salivary conditions
54
Q

What are six caries high risk factors

A 
Restoration w/i the past three years
visible cavitation
Appliances
visible plaque
Inadequate saliva
frequent carb intake
55
Q

What are filler particles made up of for composites

A

Crystalline silica (quartz)
Lithium aluminum silicate
glasses

56
Q

What is it used to form the matrix of composites

A

Bis-GMA (dimethacrylate)

UDMA (Oligomers)

57
Q

What is the coupling agent of composites

A

silane

58
Q

What initiators are used for composites

A

Benzoyl peroxide
diketone
Camphorquinone

NBDE II (5 decks)

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