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Quiz 6 > Quiz 6 > Flashcards

Quiz 6 Flashcards

1
Q

A broken full denture may be repaired with

A

Self-cure acrylic

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2
Q

Zinc oxide-eugenol cement is used in temporary restorations because it

A

Provides a sedative effect on the pulp

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3
Q

What is the MOST important factor to consider when mixing a “paste to paste” type of composite resin?

A

Avoid leaving jars open, thus allowing photopolymerization

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4
Q

When should glass ionomer cement be applied?

A

Before it lose its shiny appearance

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5
Q

A maxillary diagnostic impression should extend posterior to include the

A

Maxillary tuberosities

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6
Q

Placing some alginate into the palatal vault immediately prior to seating the maxillary impression tray will help to

A

Ensure a full impression of a high palate

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7
Q

An advantage of using a vacuum mixer when pouring up study models is that it

A

Minimizes porosity

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8
Q

In preparing the tray for an alginate impression, which of the following types of wax is the BEST choice to use on the periphery?

A

Utility

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9
Q

When Polysiloxane is properly mixed, the material will be

A

Free from streaks and uniform in color

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10
Q

When polishing the teeth prior to direct bonding, which material should be used?

A

Flour of pumice mixture

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11
Q

The MOST critical aspect of the manipulation of glass ionomer cement is

A

Incorporation of components (powder/liquid) all at once

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12
Q

Which of the following may result if the etching solution is not rinsed thoroughly from the tooth?

A

Acid will interfere with bonding of the sealant

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13
Q

When using a model trimmer, the operator should

A

Use completely dry models

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14
Q

What appearance does dry enamel have after etching and rinsing?

A

Frosted

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15
Q

When using rubber base impression material, the dental assistant should

A

Coat the tray with adhesive

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16
Q

When cementing a TEMPORARY CROWN, zinc phosphate cement is usually

A

Not used because it sets too hard to be easy removed

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17
Q

If the adhesive inside the custom acrylic tray is not allowed to dry adequately, what may happen to the material?

A

It may separate from the tray

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18
Q

Excessive bubbles in stone or plaster cast will result in which of the following?

A

Decreased strength

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19
Q

When constructing a custom impression tray, a spacer is used to

A

Provide space for impression material

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20
Q

A retraction cord might be needed for which of the following procedures?

A

Cervical (Class V) composite

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21
Q

If it is necessary to assemble a broken denture in a fixed position for repair, what is the preferred wax?

A

Sticky

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22
Q

Polycarboxylate cement must be placed

A

While it is still glossy (brillante)

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23
Q

To prepare for a denture adjustment in the operatory, the acrylic bur would be placed in the

A

Straight handpiece

24
Q

If a correctly proportioned mix of water is spatulated longer than recommended setting time be affected?

A

Setting time will be faster

25
Q

Which of the following cements is anticariogenic?

A

Glass ionomer

26
Q

In modifying the tray for an alginate impression, which of the following types of waxes is the BEST choice to use on the periphery?

A

Boxing

27
Q

An impression tray for a mandibular study model must extend beyond the

A

Retromolar pads

28
Q

Which of the following types of temporary crown could be made using the initial impression as a matrix?

A

Resin

29
Q

Increasing the water temperature when mixing alginate impression material results in a mix that is

A

Faster setting

30
Q

Wax is placed along the posterior periphery of a maxillary impression tray to assure registration of the

A

Retromolar pad

31
Q

Which of the following REQUIRES a glass slab for mixing?

A

Zinc phosphate

32
Q

What is a PRIMARY advantage of zinc oxide eugenol cement?

A

Sedative effect on pulp

33
Q

Which of these would be the BEST choice to cement a temporary acrylic crown?

A

Zinc oxide-eugenol (ZOE)

34
Q

Which of the following is an advantage of light cured composite over self-cured composite material

A

Controlled working time

35
Q

What makes glass ionomer anticariogenic?

A

Fluoride in powder

36
Q

Which of the materials is usually selected for a pulp cap?

A

Calcium hydroxide

37
Q

Which of the following bases or lines inhibits the setting of composite restorations?

A

Glass ionomer liner

38
Q

Select the LEAST abrasive polishing agent for use on exposed dentin and restorations.

A

Zirconium silicate with glycerin

39
Q

“Grit” refers to which of the following abrasive particle characteristics?

A

Size

40
Q

Moisture contamination of gypsum products may

A

Increase spatulation time

41
Q

Another term for the acrylic used to fabricate a temporary crown is

A

Methyl Methacrylate

42
Q

The PRIMARY purpose for using a gypsum vibrator when pouring impression is to eliminate

A

Entrapped air

43
Q

Athletic mouth guards should be stored on

A

A dry container

44
Q

When a case is returned from the laboratory, the packing material should be

A

Recycled

45
Q

The mixing time for gypsum products is seconds.

A

30 to 60 sec

46
Q

Higher water temperatures used to mix gypsum products will have the following ref effect

A

Shorten setting time and increase expansion rate

47
Q

A lower water/powder ratio, which reflects more powder and les water, result in:

A

Reduced strength

48
Q

Final setting of gypsum product takes approximately:

A

30 minutes

49
Q

Ideally, to ease the task of trimming the gypsum models, they should be submerged in:

A

Cool water for 5 minutes

50
Q

Gypsum products should be properly stored in a/an:

A

Cool, dry air-right container

51
Q

Which material should be tempered prior to taking an impression?

A

Reversible hydrocolloid

52
Q

A custom tray is used as a:

A

Second impression for an edentulous impression

53
Q

When mixing zinc phosphate cement, the powder and liquid are mixed over large are with a Figure-eight motion motion.

A

Figure-eight motion

54
Q

Excess zinc phosphate cement powder left on the mixing slab is always:

A

Discarded

55
Q

factor that will lengthen the setting time of zinc phosphate is:

A

Low temperature, below 65 F

Quiz 6 (1 decks)

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