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NBDE Pt 2 > High Yield Prosth > Flashcards

High Yield Prosth Flashcards

1
Q

What is the weakest porcelain?

A

Feldspathic porcelain

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2
Q

What can cause porosity in porcelain?

A

inadequate condensation

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3
Q

What can cause porcelain to turn green?

A

Silver; copper in cervical 1/3rd

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4
Q

What should be the first thing checked when seating a crown?

A

Esthetics -> contacts

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5
Q

What is the most technique sensitive part of placing veneers?

A

Preparation

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6
Q

What can cause dark stain near the margin of veneers?

A

Microleakage

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7
Q

What is the proper reduction for veneer prep?

A

.5mm

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8
Q

What is the proper process for bleaching with veneers?

A

Bleach, wait 2-3 weeks, prep veneers

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9
Q

Which fluoride should be used with veneers?

A

Sodium fluoride

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10
Q

What is the ideal reduction for PFM crown?

A

1.5-2mm

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11
Q

T/F: The functional cusp bevel in a crown prep is for retention form.

A

False

Resistance

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12
Q

T/F: The modified ridge lap pontic has minimal contact with the residual ridge.

A

True

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13
Q

When should an ovate pontic be used?

A

Anterior teeth that were recently extracted.

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14
Q

Which dimension is most important for strength of FPD connectors?

A

occlusogingival width

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15
Q

What is advantage of fiber post?

A

Has same modulous elasticity as dentin

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16
Q

What is the purpose of post?

A

Retain the core

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17
Q

What is the most important when selecting shade?

A

Value

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18
Q

T/F: Value is the black-white spectrum of a color.

A

True

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19
Q

When you have a color index of 100, which is effected?

A

Value

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20
Q

T/F: Adding a complimentary color increases the value.

A

False.

Decreases. You cannot increase value

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21
Q

T/F: Wavelength is associated with hue.

A

True

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22
Q

What are the rules for balancing, working, and protrusive contacts?

A

Balancing - BULL
Working - LUBL
Protrusive - DUML

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23
Q

In non-working movements, the lingual incline of buccal cusps of mandibular molars should hit what?

A

Buccal incline of lingual cusps of maxillary molars

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24
Q

Wear facets are seen on lingual inclines of maxillary lingual cusps and facial inclines of mandibular facial cusp on the left side of the mouth. During what movement is there an interference?

A

Left working or right non-working interference

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25
Q

Wear is seen on buccal cusps of maxillary premolars? What movement is causing this?

A

Working

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26
Q

When should the BULL rule be utilized in selective grinding?

A

When there is a non-working side interference

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27
Q

When should LUBL be utilized in selective grinding?

A

When there is a working side interference

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28
Q

When should DUML be utilized?

A

When there is a protrusive interference

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29
Q

The mesial angle of the ML cusp of maxillary 2nd molar occludes with what on mandibular 2nd molar?

A

Distal of MB cusp

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30
Q

T/F: Tooth contact will result in inaccurate terminal hinge record.

A

True

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31
Q

What position are the condyles in in CR?

A

Superior-anterior-medial

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32
Q

If both condyles break, what will be the result?

A

Posterior open bite

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33
Q

The __________ is the angle formed by the non-working condyle and the sagittal plane during lateral movement.

A

Bennett angle

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34
Q

What kind of bond is used by composite?

A

Mechanical bond (micromechanical)

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35
Q

Most likely cause of post-op composite pain?

A

Hyperocclusion

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36
Q

What determines the depth of occlusal composite?

A

Depth of decay

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37
Q

T/F: Class 1 composite preps should contain only pit and fissure carries.

A

True

No extension

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38
Q

What two factors determine successful posterior composite?

A

Type of resin and type of prep

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39
Q

What is the disadvantage of a large MOD posterior composite?

A

Occlusal wear

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40
Q

Which type of prep has the highest C-factor?

A

Class 1 and Class 5 (both are 5 walled preps, so C factor = 5)

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41
Q

Which type of caries is transillumination most useful?

A

Class III

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42
Q

Which part of composite stains the most?

A

Gingival proximal

43
Q

What is the best material for a pt with a lot of cervical caries?

A

GI

44
Q

MOD amalgam prep goes 1/3 the distance of the cusp height. What should you do?

A

MOD onlay

45
Q

T/F: Indirect restorations (onlay/inlay) have better marginal seal than direct composites.

A

False

46
Q

What is the main reason for the failure of posterior composites?

A

Case selection and technique

47
Q

What are some causes for sensitivity after composite placement?

A

Occlusion, debonding

48
Q

What is the most common reason for replacing anterior composites?

A

Color change

49
Q

How long after bleaching should you wait before bonding composite?

A

1 week

50
Q

Pt has pain to cold and chewing after Class I composite filling? You ditch it out with a bur and the pain is gone. What was the cause?

A

Polymerization shrinkage

51
Q

What is the highest chance of leakage with a rubber dam?

A

Holes punched too close

52
Q

What are the steps for adding composite to porcelain?

A

Microetch, etch, silanate, bond

53
Q

T/F: Etchant provides a chemical bond.

A

False

Mechanical

54
Q

What is the difference between self-etch and total etch?

A

Self-etch = etch and primer are together, not as strong of an etchant, does not always remove smear layer
Total etch = separate phosphoric acid used for etch and rinse technique

55
Q

Which type of etch is less reliable?

A

Self-etch

56
Q

What is the function of filler in composite?

A

More filler = higher strength, less shrinkage, do not polish as well

57
Q

T/F: HEMA composites can cause contact dermatitis.

A

True

58
Q

What are the components of GI cements?

A

Polyacrylic (polymeric) acid.

Silicate glass.

59
Q

What is the purpose of mixing GI cement on a glass slab?

A

Incorporate more powder

60
Q

T/F: Impression inaccuracies will cause the crown to fit poorly on the master cast.

A

False

Will fit die, will not fit in mouth

61
Q

What should be used to cement all ceramic crowns?

A

Composite resin

62
Q

T/F: GI should be used to cement all ceramic crowns.

A

False

Expansion can cause cracking of porcelain

63
Q

What is the most radiopaque aspect of composite?

A

Barium

64
Q

Which type of composites have the most color stability?

A

Light cure due to TEGDMA

65
Q

T/F: Microfill composites have a smoother finish than hybrid composites.

A

True

Less staining

66
Q

What is the significance of their being less nitrates in light cured composite?

A

Shade balance

67
Q

What is the wavelength of visible light?

A

380-740nm

68
Q

T/F: Glass ionomer forms an ionic bond.

A

True

69
Q

What is most critical in a direct pulp cap?

A

Place hard liner/base over CaOH

70
Q

What is a negative of GI cements?

A

low pH can cause pulp irritation/sensitivity

71
Q

T/F: GI has less surface hardness, compressive strength, and tensile strength than composite.

A

True

72
Q

Zinc oxide eugenol can be strengthened with what?

A

Methyl methacrylate

IRM/Reinforced ZOE

73
Q

What do you fill primary tooth RCT with?

A

ZOE w/o catalyst or accelerator

74
Q

What does BIS-GMA do when added to PMMA?

A

Adds strength, crosslinking. Gives doughy texture - increased working time

75
Q

T/F: An excessive amount of monomer can cause shrinkage.

A

True

76
Q

What happens if you increase water:powder ratio in alginate?

A

Increase working time. Decrease expansion.

77
Q

What will increase expansion (decrease working time) of gypsum?

A
  1. Longer spatulation time.
  2. Decrease water:powder ratio
  3. Hot water
78
Q

What is used if angioedema to alginate?

A

C1 esterase inhibitor

79
Q

Why does alginate still shrink in 100% humidity?

A

Syneresis

80
Q

What is a disadvantage of polyether?

A

Sticks to teeth

81
Q

What is the most rigid impression material?

A

Polyether

82
Q

What is the most stable elastic impression material?

A

Additional silicone

83
Q

How many mg of fluoride in 1 liter of water at 1ppm?

A

1mg

84
Q

What does fluoride replace in hydroxyappetite?

A

Hydroxyl group

85
Q

T/F: Fluorapatite is less soluble than hydroxyapatite.

A

True

86
Q

T/F: Fluoride increases strength of collagen.

A

False

87
Q

T/F: Fluoride lowers pH of oral cavity.

A

False

88
Q

How long should fluoride trays (foam) be applied?

A

4 minutes

89
Q

At what age should supplemental fluoride be started?

A

6 months

90
Q

What is a toxic dose of fluoride?

A

5-10 mg/kg

91
Q

What is the average concentration of fluoride in water?

A

1 ppm

92
Q

EPA maximum allowed concentration of fluoride in water?

A

4 ppm

93
Q

How is fluoride administered in schools?

A

.2% weekly

94
Q

How should you supplement a 4 y.o. fluoride use when she only gets .28 ppm daily?

A

Systemic supplement

95
Q

What are the teeth most likely to be effected by early childhood caries?

A

Max anterior and primary molars

96
Q

What is the effectiveness of water fluoridation?

A

20-40%

97
Q

How many people/cities have fluoridated water in U.S.?

A

65-70%

98
Q

What is the difference between primary, secondary, and tertiary treatment of caries?

A

1 - prevention (fluoridated water)
2 - eliminate/reduce disease (filling)
3 - rehabilitation (dentures/c&b)

99
Q

T/F: Fluorosis inhibits remineralization.

A

True

100
Q

How is severity of fluorosis determined?

A

Look at 2 worst teeth

101
Q

T/F: Acidulated fluoride will wear away GI.

A

True

102
Q

Which fluoride will not stain veneers?

A

Sodium fluoride

103
Q

What is the bleaching agent used for home bleaching?

A

10% carbamide peroxide

NBDE Pt 2 (12 decks)

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