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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
Wear is seen on buccal cusps of maxillary premolars? What movement is causing this?
Working
26
When should the BULL rule be utilized in selective grinding?
When there is a non-working side interference
27
When should LUBL be utilized in selective grinding?
When there is a working side interference
28
When should DUML be utilized?
When there is a protrusive interference
29
The mesial angle of the ML cusp of maxillary 2nd molar occludes with what on mandibular 2nd molar?
Distal of MB cusp
30
T/F: Tooth contact will result in inaccurate terminal hinge record.
True
31
What position are the condyles in in CR?
Superior-anterior-medial
32
If both condyles break, what will be the result?
Posterior open bite
33
The __________ is the angle formed by the non-working condyle and the sagittal plane during lateral movement.
Bennett angle
34
What kind of bond is used by composite?
Mechanical bond (micromechanical)
35
Most likely cause of post-op composite pain?
Hyperocclusion
36
What determines the depth of occlusal composite?
Depth of decay
37
T/F: Class 1 composite preps should contain only pit and fissure carries.
True | No extension
38
What two factors determine successful posterior composite?
Type of resin and type of prep
39
What is the disadvantage of a large MOD posterior composite?
Occlusal wear
40
Which type of prep has the highest C-factor?
Class 1 and Class 5 (both are 5 walled preps, so C factor = 5)
41
Which type of caries is transillumination most useful?
Class III
42
Which part of composite stains the most?
Gingival proximal
43
What is the best material for a pt with a lot of cervical caries?
GI
44
MOD amalgam prep goes 1/3 the distance of the cusp height. What should you do?
MOD onlay
45
T/F: Indirect restorations (onlay/inlay) have better marginal seal than direct composites.
False
46
What is the main reason for the failure of posterior composites?
Case selection and technique
47
What are some causes for sensitivity after composite placement?
Occlusion, debonding
48
What is the most common reason for replacing anterior composites?
Color change
49
How long after bleaching should you wait before bonding composite?
1 week
50
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?
Polymerization shrinkage
51
What is the highest chance of leakage with a rubber dam?
Holes punched too close
52
What are the steps for adding composite to porcelain?
Microetch, etch, silanate, bond
53
T/F: Etchant provides a chemical bond.
False Mechanical
54
What is the difference between self-etch and total etch?
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
Which type of etch is less reliable?
Self-etch
56
What is the function of filler in composite?
More filler = higher strength, less shrinkage, do not polish as well
57
T/F: HEMA composites can cause contact dermatitis.
True
58
What are the components of GI cements?
Polyacrylic (polymeric) acid. | Silicate glass.
59
What is the purpose of mixing GI cement on a glass slab?
Incorporate more powder
60
T/F: Impression inaccuracies will cause the crown to fit poorly on the master cast.
False Will fit die, will not fit in mouth
61
What should be used to cement all ceramic crowns?
Composite resin
62
T/F: GI should be used to cement all ceramic crowns.
False Expansion can cause cracking of porcelain
63
What is the most radiopaque aspect of composite?
Barium
64
Which type of composites have the most color stability?
Light cure due to TEGDMA
65
T/F: Microfill composites have a smoother finish than hybrid composites.
True Less staining
66
What is the significance of their being less nitrates in light cured composite?
Shade balance
67
What is the wavelength of visible light?
380-740nm
68
T/F: Glass ionomer forms an ionic bond.
True
69
What is most critical in a direct pulp cap?
Place hard liner/base over CaOH
70
What is a negative of GI cements?
low pH can cause pulp irritation/sensitivity
71
T/F: GI has less surface hardness, compressive strength, and tensile strength than composite.
True
72
Zinc oxide eugenol can be strengthened with what?
Methyl methacrylate IRM/Reinforced ZOE
73
What do you fill primary tooth RCT with?
ZOE w/o catalyst or accelerator
74
What does BIS-GMA do when added to PMMA?
Adds strength, crosslinking. Gives doughy texture - increased working time
75
T/F: An excessive amount of monomer can cause shrinkage.
True
76
What happens if you increase water:powder ratio in alginate?
Increase working time. Decrease expansion.
77
What will increase expansion (decrease working time) of gypsum?
1. Longer spatulation time. 2. Decrease water:powder ratio 3. Hot water
78
What is used if angioedema to alginate?
C1 esterase inhibitor
79
Why does alginate still shrink in 100% humidity?
Syneresis
80
What is a disadvantage of polyether?
Sticks to teeth
81
What is the most rigid impression material?
Polyether
82
What is the most stable elastic impression material?
Additional silicone
83
How many mg of fluoride in 1 liter of water at 1ppm?
1mg
84
What does fluoride replace in hydroxyappetite?
Hydroxyl group
85
T/F: Fluorapatite is less soluble than hydroxyapatite.
True
86
T/F: Fluoride increases strength of collagen.
False
87
T/F: Fluoride lowers pH of oral cavity.
False
88
How long should fluoride trays (foam) be applied?
4 minutes
89
At what age should supplemental fluoride be started?
6 months
90
What is a toxic dose of fluoride?
5-10 mg/kg
91
What is the average concentration of fluoride in water?
1 ppm
92
EPA maximum allowed concentration of fluoride in water?
4 ppm
93
How is fluoride administered in schools?
.2% weekly
94
How should you supplement a 4 y.o. fluoride use when she only gets .28 ppm daily?
Systemic supplement
95
What are the teeth most likely to be effected by early childhood caries?
Max anterior and primary molars
96
What is the effectiveness of water fluoridation?
20-40%
97
How many people/cities have fluoridated water in U.S.?
65-70%
98
What is the difference between primary, secondary, and tertiary treatment of caries?
1 - prevention (fluoridated water) 2 - eliminate/reduce disease (filling) 3 - rehabilitation (dentures/c&b)
99
T/F: Fluorosis inhibits remineralization.
True
100
How is severity of fluorosis determined?
Look at 2 worst teeth
101
T/F: Acidulated fluoride will wear away GI.
True
102
Which fluoride will not stain veneers?
Sodium fluoride
103
What is the bleaching agent used for home bleaching?
10% carbamide peroxide

NBDE Pt 2 (12 decks)

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