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Fixed Pros Final Practice Exam > FInal exams combined 2018 and 2020 > Flashcards

FInal exams combined 2018 and 2020 Flashcards

1
Q

Put the following in order from lowest to highest tensile strength

resin
RMGI
ZnPO4
GI

A

ZnPO4 < GI < RMGI < resin

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2
Q

If a restoration does not cement it is often from

a. Premature occlusion
b. Pulpitis
c. Loosening of the restoration
d. All of the above

A

D. All Above

others include: recurrent caries, restoration incomplete seating

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3
Q

All of the following are different about RMGI and GI except

a. Tensile strength
b. Fluoride release
c. Bond strength

A

b. Fluoride release

- both have FAS (powder) which releases Fluoride

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4
Q

We do not use RMGIs for core build up because of inadequate

a. Strength
b. Does not bond to tooth structure
c. Thermal expansion
d. Releases fluoride

A

a. strenght

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5
Q

What is the chemical bond for glass ionomers is?

A

a. Calcium – carboxylate

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6
Q

If there is a leaky restoration and the patient is hypersensitive what do you do

A

a. Remake interim and cement with zinc eugenol

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7
Q

ADA has specifications for strength. What is it and what does not meet this
requirement?

A

a. 70 MPa; zinc polycarboxylate

Zinc polycarboxylate is 55-67 MPa

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8
Q

According to the ADA film thickness of a cement needs to be

A

less than 25 microns

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9
Q

Non-working side prematurities on #30 occur with

A

Inner inclines of buccal cusps of mandibular????/

originally said lingual inclines of buccal cusps of mand.

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10
Q

Working side prematurities on #30 occur with

A

a. Buccal inclines of lingual cusps of mandibular

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11
Q

If close mouth and deviates to the buccal on #30 it is because of

A

a. Lingual inclines of buccal cusps

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12
Q

Once you seat the crown it decreases viscosity. What property is this?

A

a. Pseudoplasticity - material doesn’t flow until under pressure. low viscosity = high
shear rate. This is why the same material is used in the tray and syringe

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13
Q

What does not remove from undercuts?

A

a. Polyether –this is an elastic non-aqueous and elastic means it can be removed
from undercuts so this is wrong, correct? someone check. good

YESSS IT IS polyether

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14
Q

Which of the following is not true of type III gold crowns?

a. Subgingival crowns must be burnished on die
b. Supragingival crowns must be burnished in the mouth
c. Marginal improvement can occur by burnishing
d. Gross marginal movement can occur by burnishing

A

d. Gross marginal movement can occur by burnishing

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15
Q

All addition reactions can be multiple pours. This is because they don’t have any
byproducts.

A

true and true

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16
Q

When hydrophilic impression materials are disinfected, they can potentially absorb the
disinfectant. This absorption and subsequent expansion is defined by the term syneresis

A

First statement true second statement false

  • Syneresis - the expulsion of water or other liquid molecules from dental impression
    materials (alginate for example) after an impression has been taken. Due to this process, the impression shrinks a little and therefore its size is no longer accurate.
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17
Q

t/f: This absorption and subsequent expansion is defined by the term syneresis

A

false

true would be imbibition

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18
Q

An acceptable working cast must be accurately reproduced:

a. The prepared tooth structure and unprepared surface just apical to the finish line
b. The teeth adjacent to the prepared tooth structure
c. All tooth surfaces involved in articulation and excursive guidance
d. All of the above

A

all above

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19
Q

Mechanical mixing of stone under vacuum is recommended for dental casts because it………

A

a. Results in less porous cast with greater strength

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20
Q

Increasing the water to powder ratio of gypsum products will have which of the
following results?

A

a. Decreased compressive strength

increase in water decreases the compressive strength

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21
Q

The ratio of water to powder for type 4 stone should be weighted/measured as
recommended by the manufacturer and is approximately

A

20 cc/100g

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22
Q

Extra credit question: radiograph asking what was wrong and how it affects marginal integrity

A
  • can be small ledge/short margin (increases risk of recurrent caries) or open margin. Both would require remake of cast
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23
Q

What is wrong with this metal ceramic prep?

A

didnt give answer.

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24
Q

Gave very short tooth on one side (picture was from lecture) and asked what to do

A

Pin retention with core build up

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25
Q

Gave picture with open margins and asked what was wrong

A

Gave picture with open margins and asked what was wrong

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26
Q

The occlusal reduction for a ceramic reduction

A

1.5-2.0 mm

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27
Q

The dental casting investment must exhibit compensation expansion to equal the

A

Alloy solidification shrinkage

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28
Q

Occlusal stops in a custom try function to:

a. Prevent tray from over-seating
b. Provide for a uniform thickness and impression material
c. Provide retention for the impression material
d. A and B
e. All of the above

A

d. A and B
- —————————————–
a. Prevent tray from over-seating b. Provide for a uniform thickness and impression material

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29
Q 
Which of the following instruments is recommended for adjustment of the proximal
contacts of a cast gold crown?
a. Diamond point 
b. Moore’s abrasive disc 
c. Rubber abrasive disc 
d. All of the above 
e. B and C only
A

e. B and C Only

b. Moore’s abrasive disc
c. Rubber abrasive disc

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30
Q

Throat pack is enough to cover oropharynx on floor of the mouth if floss is not used.

Patient should not be less than 45 degrees.

A

True and FALSE

-not MORE than 45 degrees

31
Q

Disadvantage of cast/separate die is:

A

a. Will have to transfer mold and can break

32
Q

To help with the wax pattern you must

A

nvest immediately

33
Q

In order to provide resistance to faciolingual horizontal displacement on a short crown
preparation grooves should be placed on the ____ surface.

A

a. Mesial/distal

34
Q

A discrepancy can occur in the radius of tooth movement in the horizontal plane between that which is reproduced on a small hinge articulator and what occurs in the mouth. When posterior cast restorations are made, the result would be:

A

NWS interferences (Non working side)

35
Q

The articulated casts used to fabricate routine fixed prosthodontic restorations (master
cast/dies) should be mounted using which of the following records?

a. Centric relation interocclusal record at an increased vertical dimension of occlusion
b. Centric relation interocclusal record at physiologic rest position
c. Hand articulation when accurate, stable interdigitation is possible
d. Maximum intercuspation record at the existing VDO between prepared teeth/opposing teeth

A

c and d

c. Hand articulation when accurate, stable interdigitation is possible
d. Maximum intercuspation record at the existing VDO between prepared teeth/opposing teeth

36
Q

What allows for the crown to adapt to the margin but from the 1 mm point upward there is space for cement

A

a. Die spacer

37
Q

!!!!!!!!!!!
ML buccal cusp would travel through without contact to the

a. Lingual groove (What is this saying) b. How can you even have a ML buccal cusp? Like what tooth is this?

!!!!!!!!!!!!!!!!!!

A

I have no clue

38
Q

Cryanolaculate is for

A

Abrasion resistance

39
Q

Which of the following is false about the emergence profile?

A

It should be bulky and concave

40
Q

Burning out of wax and residue is due to what process?

A

burn out

41
Q

Patient has allergic reaction to crown. What would be in it?

A

Nickel

42
Q

Crown has 74% Au. What is this considered?

A

high noble alloy

43
Q

You get bubbles after taking a VPS impression because

A

a. You lift the syringe out

44
Q

Characteristics of gold-based alloys

a. Tarnish resistance
b. Malleability
c. Both

A

both

45
Q

% of elongation is related to

A

burnishability

46
Q

MOD Premolar should have pins placed where?

A

line angles.

47
Q

Pins need to be

A

a. 2 mm in to dentin and 2 mm into restorative material

48
Q

What restoration is RMGI good for?

A

all gold

49
Q

Hyperpulpemy and open margins what do ya do?

A

remake, use zoe or irm and cement

50
Q

what is not true about onlay preps?

A

no answer. what are we all thinking?

51
Q

Deep carious lesion, what do you do about the axial wall extension of 1.5mm?

A
  • go to lesion, fill with liner base, then take back wall to 1.5 mm
  • get all the cavity out and extend the wall, make it sharp and parallel for good retention and resistance form
52
Q

Lingual cusp larger than buccal what does this cause?

A
  • prevention of occlusal irregularities in later excursion
  • working side interferences in laterotrusive
  • non-working side interferences in mediotrusive
53
Q

Picture of prep on premolar what’s wrong?

A
  • facial reduction bad

- facial undercut (diverging prep)

54
Q

Why would you. Not use GI?

A

-decreased strength

55
Q

Angle more than 90 degrees means _____ and imrpesion material is ____

A

hydrophobic and is VPS

56
Q

Mounting casts on a program semi-adjust articul with facebow transfer is recommended for fixed prosth treatment because it allows a close approximation of the _______ to that of the pt.

A
  • transverse horizontal axis
  • radius of the arc of closure and cusp path for posterior teeth
  • anatomic determinants of mand movement
  • all above (This is answer)
57
Q

an interocclusal record made in CR should exhibit each of the folowing except?

A

posterior teeth should be contacting in centric occlusion

58
Q

_________ is defined as stress relaxation that occurs with hydrocolloid gel networks producing extrusion of water and subsequent shrinkage.

A

a. syseresis

59
Q

_________ is defined as the absorption of moisture resulting in subsequent expansion of impression material. This phenomenon is more likely with hydrophobic or hydrophillic impression material?

A

imbition

hydrophillic

60
Q

The best method for controlling the setting time of irreversible hydrocolloid is altering

a. mixing time
b. water/powder ration
c. water temp
d. all of the above

A

water temp

61
Q

When making a vinyl polysiloxane impression for a FPD, a custom tray is preferred for all of the following reasons EXCEPT:

  1. ) When making a vinyl polysiloxane impression for a FPD, a custom tray is preferred for all of the following reasons EXCEPT:
    a. Custom trays require less impression material
    b. Custom trays have more uniform material thickness and uniform poly shrinkage leading to increased impression accuracy.
    c. impression made in custom trays are easier to remove from the mouth.
    d. custom tray’s will fit the patient’s mouth better.
A

c. impression made in custom trays are easier to remove from the mouth.

62
Q

5.) An acrylic resin custom tray should not be used the same day it is made because acrylic resin poly shrinkage that occurs for 8-24 hours can result in impression distortion.

A

A. Both the statement and reason are correct.

63
Q

Polysulfide impression material should be poured after a _______________ delay in order to allow recovery of some of the impression distortion occuring with tray removal.

A

30 min to 1 hr

64
Q

Which of the following impression materials will distort the least when stored for 24 hours before pouring?

A.) Vinyl Polysiloxane
B,) Polysulfide
c) Alginate
D.) Both A and B

A

A. Vinyl Polysiloxane

65
Q

The adhesive placed inside a custom tray should not be allowed to dry prior to placing the impression material in the tray because the sticky adhesive surface will help bond material to the tray.

A

. Both the statement and the reason are BS.

66
Q

Which of the following properties is least desirable in an impression material?

A

High rigidity after set

67
Q

Which of the following impression materials is the most rigid and therefore, most difficult to remove from the mouth?

A

polyether

Her reasons was that formulations of polyether contain high amounts of silica and as a result were more rigid that other materials.

68
Q

Overall, which elastomeric impression material has the most ideal properties?

A

Vinyl Polysiloxabe

Reason is that polyether or PVS could be ideal. Due to problems with PE rigidity, VPS would probably be the answer.

69
Q

The setting time of zinc phosphate cement can be retarded by

A

decreasing the rate of addition of powder to liquid.

70
Q

Which of the following do polycarboxylate and glass ionomer cement have in common?

A

polyacrylic acid

71
Q

Which statement is true in relation to dual-cure composite cement?

A

will not reach optimum polymerization without light activation

72
Q

The acceptable film thickness of a luting agent/cement is….

A

25 microns

73
Q

After setting, the luting agent/cement that is most easily removed from the restoration margins is…..

A

zinc phosphate

74
Q

The least soluble cement/luting agent is….

A

composite resin

Fixed Pros Final Practice Exam (1 decks)

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