Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Fixed Prosthodontics I > Test 2 Review > Flashcards

Test 2 Review Flashcards

1
Q

what is the benefit of delayed cementation of fiber posts?

A

results in higher retentive strengths in comparison to immediate cementation and the best results were obtained when the luting agent was brought into the post space with lentigo spirals or specific syringes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

___ thickness influences the pullout strength of fiber-reinforced posts. The highest bond strength values are obtained when ___

A
  • Resin cement fill
  • the cement layer oversized the post spaces but not larger than 0.3mm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

When is the use of core build-up materials as post luting cements recommended?

A

Only one scenario: Don’t want to remove dentin to make room for a larger post. You can use the core build-up materials to cement the post in these cases. In other words, if you have a large gap, you can use the build-up materials to cement the post.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are 4 factors for the long term success of post endodontic restorations?

A
  • occlusion
  • preservation of tooth tissue
  • presence of a ferrule effect
  • adhesion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Evidence shows that ___ posts are superior to metal posts or tooth-colored posts, like zirconia dowels.

A

fiber

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

T or F:

Posts should be used to reinforce the tooth

A

false

they are used to retain restoration and not reinforce the tooth.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

___ and ___ forces influence the prognosis of restorations on endodontically treated teeth.

A

Functional and parafunctional

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Nonaxial forces are a risk for ___

A

fatigue fracture of teeth, cement, and restorative material.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what are fundamental components of a complete laboratory prescription?

A
  1. patient name
  2. patient MRN number
  3. date of prescription
  4. due date of indirect restoration
  5. school of dentistry name and contact info
  6. tooth or teeth numbers
  7. desired materials for indirect restoration
  8. design info for indirect restoration (if indicated) – margin design, special instructions for material placement, pontic design if FPD
  9. other special instructions
  10. shade info if indicated
  11. photographs if indicated (no cell phone pictures)
  12. due date
  13. attending signature
  14. attending license number
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what are the 3 considerations/parameters/stipulations of tooth preparations, and what is the goal of the dentist with respect to these parameters?

A

mechanical, biological, esthetic

we want to be in the center of that venn diagram with our restorative work; sometimes we have to sacrifice one of those principles to get a better overall result

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what can happen if you take an alginate impression, then immediately rinse it off and put it in a plastic bag?

A

it can take on water (imbibition)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what are the 3 types of resin cements?

A

adhesive, self-adhesive, esthetic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what is an example of a self adhesive resin cement?

A

relyX unicem

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

of adhesive, self adhesive, and esthetic resin cements, which is has the strongest bond?

A

adhesive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

of adhesive, self adhesive, and esthetic resin cements, which has to be used with a bonding agent?

A

esthetic

it will be incredibly strong, but not as strong as adhesive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is bis-acryl used for?

A

temporary material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

___ is a temporary material that has good color selection, but the shelf life is not very good. why?

A
  • bis-acryl
  • the colors start to darken after the expiration date
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

bis-acryl is a ___-based resin material

A

bis-GMA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

would you want to use bis-acryl for a bridge? why or why not?

A

no

it is a big-GMA resin material and so it is brittle

triad material is better for bridges

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what is it that makes the outer layer of bis-acryl gummy after polymerization?

A

the oxygen inhibited layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

when can you add to bis-acryl?

A

when the oxygen inhibited layer is still there

it is much more difficult if that layer is gone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

___ is a methylmethacrylate that has to be light cured to fully polymerize

A

unifast

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what is a disadvantage of unifast?

A

not great esthetically

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what are some advantages of unifast?

A
  • handles very nice and is very forgiving
  • good for contours of gingival embrasures where you feel like material might get locked in
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

what type of matrix should you use with unifast?

A

alginate

don’t want to use the putty matrix

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

___ is the most esthetic version of zirconia. why?

A

high trans, because it has more zirconia in the cubic phase (this also means it’s slightly weakened)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

___ is the strongest phase of zirconia, and it is stabilized by ___

A
  • tetragonal
  • yttria, ceria, and alumina
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

what is the ideal length of a post, and how much gutta percha should be at the apex?

A
  • 2/3 - 3/4 the length of the root
  • 4-5mm of gutta percha at the apex
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

___ posts tend to stress dentin at the coronal end, while ___ posts tend to stress dentin at the apical end

A
  • tapered
  • parallel
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what happens to stress forces on dentin if you shorten a post?

A

it increases the stress forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

is it ok to use a green stone to adjust zirconia?

A

no, because it will cause a phase change to monoclinic since it’s not as strong of a material as zirconia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

transformation toughening is also called ___

A

crack propagation prevention

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

transformation toughening occurs when a crack forms in zirconia, causing a phase change from ___ to ___

A

tetragonal to monoclinic, which is larger, so it makes it tougher and more resistant to more cracking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

zirconia can break down from certain insults like heat and friction. what is the phase change that occurs, and what can it cause?

A
  • tetragonal to monoclinic
  • can cause fracture, increased abrasivity, low-temp aging degradation, increased hydrothermal solubility
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

is build up material harder or softer than tooth structure?

A

softer

36
Q

is it ok to expose a pin while you are doing a buildup?

A

yes, but you don’t want to cut the pin while doing it

37
Q

clinically, when delivering a crown, which is the first parameter to check?

A

proximal contacts

38
Q

what is scotopic vision and photopic vision?

A
  • scotopic - rods
  • photopic vision - cones
39
Q

what type of vision do you use when doing shade matching?

A

scotopic (rods)

40
Q

when shade matching, if you’re going to err, you should err on the light or dark side, and why?

A

light side, because it’s much easier to darken a light shade rather than lighten a dark shade

41
Q

the surface of what tooth has the most dominant hue?

A

cervical 1/3 of an unrestored upper canine

42
Q

T or F

you should never cut dry using a high speed handpiece

A

false

while it is really important to keep teeth wet to avoid friction heat with high speed handpieces, it is acceptable to cut dry on a non-vital tooth, or on a vital tooth if the RPMs are really low (i.e. stall-out) and if the tooth is kept moist intermittently

*you can also cut dry with a slow speed

43
Q

what is the liquid component of IRM?

A

eugenol (oil of cloves)

44
Q

___ is a good temporary material to put on a pulp exposure of a tooth that needs endo. it keeps the tooth “calm” enough until completion of the root canal.

A

IRM (ZOE + acrylic powder + eugenol)

45
Q

ZOE + acrylic powder + eugenol = ___

A

IRM (intermediate restorative material)

46
Q

what should you do if you get a pulp exposure on a direct restoration, like an MO?

A

it needs to remain uncontaminated by saliva and other things, and must remain moist

chances are fairly good at this point to do a pulp cap and the tooth may never need endo

47
Q

what should you do if you get a pulp exposure on an indirect restoration?

A

the risk is too high for a direct pulp under indirect restorations, so you’ll want to do an indirect pulp cap or RCT depending on how deep the pulp exposure is

48
Q

___ is the liquid component of zinc polycarboxylate

A

polyacrylic acid

49
Q

does polyacrylic acid cause pulpal sensitivity? why or why not?

A

no, because it’s too bit to penetrate dentin tubules

50
Q

polyacrylic acid is fundamental in the development of ___

A

glass ionomer cement

51
Q

polyacrylic acid is found in ___ and ___, and is used as a conditioner liquid for ___

A
  • polycarboxylide cements and glass ionomer cements
  • resin modified glass ionomer cements
52
Q

___ describes a material that maintains the same size as it sets and as it’s removed from the mouth

A

dimensional accuracy

53
Q

___ is how long a material stays the same size without distorting

A

dimensional stability

54
Q

___ is an impression material’s ability to rebound back to proper dimensions

A

elastic recovery

55
Q

putty material is an example of what type of impression material?

A

condensation silicone, which is a type of elastomer

56
Q

what is the biproduct of condensation silicones, and what is their best use?

A
  • ethyl alcohol
  • silicone matrices only
57
Q

PVS is what type of impression material?

A

addition silicone, which is a type of elastomer

58
Q

what is the biproduct of PVS? what is the scavenger? what is the problem with cheaper PVS materials?

A
  • hydrogen gas
  • palladium
  • cheaper materials don’t have the scavenger so you need to let it sit for a while so that the H2 gas doesn’t produce air bubbles
59
Q

sulfur compounds (latex gloves) should not be used with what impression material?

A

PVS

60
Q

polyether is what type of impression material?

A

elastomer

61
Q

what are 3 disadvantages of polyether?

A
  • most rigid of all the elastomers
  • terrible taste
  • dimensional stability is not on par with PVS
62
Q

which elastomer has a terrible smell, is accurate, you want to pour it quickly, and cannot be used for more than one pour?

A

polysulfide rubber base

(not used very often)

63
Q

___ describes tissue at the attachment apparatus that is very thin and more susceptible to recession

A

thin biotype

64
Q

___ describes tissue at the attachment apparatus that is very thick, including robust crestal bone, and is less susceptible to recession

A

thick biotype

65
Q

for anterior zirconia crown preparation, what are the reduction measurements for the following?

facial depth at margin

lingual depth at margin

lingual concavity

incisal reduction

A
  • facial depth at margin - 0.5-1.0mm
  • lingual depth at margin - 0.5-1.0mm
  • lingual concavity - 1.0-1.5mm
  • incisal reduction - 2.0-3.0mm
66
Q

for anterior lithium disilicate crown preparation, what are the reduction measurements for the following?

facial depth at margin

lingual depth at margin

lingual concavity

incisal reduction

A
  • facial depth at margin - 1.0-1.5mm
  • lingual depth at margin - 1.0-1.5mm
  • lingual concavity - 1.5-2.0mm
  • incisal reduction - 2.0-3.0mm
67
Q

which type of stone is use as a mounting stone and has the least amount of expansion upon setting?

A

type I

68
Q

type ___ dental stone is used mostly as impression stone

A

III

69
Q

type ___ dental stone is a die stone and is not as hard as type V

A

IV

70
Q

type ___ dental stone is a die stone, expands a lot, is very hard, and is used for ceramo-metal restoration

A

V

71
Q

___ can be added to stones to increase abrasive resistance

A

thin cyanoacrylate

72
Q

hydrocal and densite are both ___-hemihydrate

A

alpha

73
Q

hydrocal is used to make type ___ dental stone

A

III

74
Q

densite is used to make type ___ dental stone

A

IV and V

75
Q

beta-hemihydrate is used to make type ___ dental stone

A

I and II

76
Q

alpha-hemihydrate is used to make type ___ dental stone

A

III (hydrocal), IV (densite), and V (densite)

77
Q

how does glass ionomer adhere to tooth structure?

A

carboxylate (in cement) and calcium (in tooth) ionic bond

78
Q

___ is the liquid component of zinc polycarboxylate

A

distilled water

79
Q

how does zinc polycarboxylate adhere to tooth structure?

A

calcium chelation bonds

80
Q

what is hue, chroma, and value?

A
  • hue is the color (ex. blue vs. red vs. yellow), determined by the wavelength of the reflected and/or transmitted light observed
  • chroma is the intensity of the hue (aka saturation, strength of hue, concentration of pigment)
  • value is the relative lightness or darkness of a hue
81
Q

does a higher value correspond to a lighter or darker appearance?

A

lighter

82
Q

___ is the phenomenon of two colors that match under one set of conditions, but fail to match under a different set

A

metamerism

83
Q

does a base strengthen the tooth?

A

no, its purpose is getting back to an ideal prep, and also serves as a thermal insulator

84
Q

what does a liner provide?

A

chemical barrier

*not* a thermal insulator

85
Q

what do build-ups do?

A

increase attachment/connection between a restoration and the tooth

86
Q

if given the choice, would you want to use a post?

A

no (iatrogenic fracture)

87
Q

what are posts used for?

A

they enhance the connection between the tooth and the restoration

Fixed Prosthodontics I (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions