Deck 45: Dental Cements

Question 1

The type of glass ionomer cement used for orthodontic cementation is type:

A)I
B)II
C)III
D)I, II, or III

Answer 1

I

Question 2

Type _____ glass ionomer cement is designed for restoring areas of erosion near the gingiva.

A)I
B)II
C)III
D)IV

Answer 2

II

Question 3

A _____ is classified as a type I dental cement and acts as an adhesive to hold together the indirect restoration and the tooth structure.

A)temporary cement
B)luting cement
C)provisional cement
D)liner

Answer 3

luting cement

Question 4

The "Guidelines for Mixing Dental Cements" tell you to:

A)incorporate each liquid increment into the powder.
B)dispense the powder first, and then the liquid.
C)set the material out at the beginning of the procedure.
D)hold the bottle of liquid at a 45° angle, to ensure consistent-sized drops when dispensing liquid.

Question 5

A delay between the final mix and the actual seating of the restoration could result in _____ and the possibility of the casting not fitting completely.

A)decreased viscosity
B)an initial setting process
C)improved thermal properties of the material
D)improved flow characteristics

Question 6

Which type of cement is preferred for cementation of ceramic veneers?

A)Zinc phosphate
B)Polycarboxylate
C)Glass ionomer
D)Composite resin

Question 7

When composite resin cement is used,the tooth must be:

A)free of all plaque and debris.
B)etched or treated with a bonding system.
C)sprayed with water before cementation.
D)both a and b.

Question 8

Permanent cements are used for luting all except:

A)laminate veneers.
B)orthodontic fixed appliances.
C)provisionals.
D)cast restorations.

Question 9

Which of the following cement types is(are) the most versatile and the least irritating to the pulp?

A)ZOE cement
B)Glass ionomer cement
C)Composite resin cement
D)Both a and b

Question 10

To increase the working time of glass ionomer it can be mixed:

A)quickly.
B)slowly.
C)on a glass slab.
D)none of the above.

Question 11

Which of the following is the most important rule to follow when preparing dental cements?

A)Working as quickly as possible
B)Following the manufacturer's instructions
C)Making the mix as thick as possible
D)Doing all of the above

Question 12

Which cement inhibits recurrent decay?

A)Zinc phosphate
B)Glass ionomer
C)Zinc oxide-eugenol
D)Composite resin

Question 13

Temporary cements are used when the dentist:

A)is cementing porcelain laminate veneers.
B)will need to remove the indirect restoration at a later time.
C)is cementing cast restorations permanently.
D)restores teeth with silver amalgam restorations.

Question 14

The cement that gives off an exothermic reaction and must be spatulated over a wide area of a cool,dry,thick glass slab is:

A)zinc oxide-eugenol (ZOE).
B)polycarboxylate.
C)zinc phosphate.
D)composite resin.

Question 15

Polycarboxylate cement:

A)forms a mechanical bond to tooth structure.
B)is generally used as a temporary sedative cement.
C)is less irritating to the pulp than zinc phosphate cement.
D)must be mixed on a glass slab.

Question 16

If excess cement is not removed from in and around the gingival margin and sulcus of the tooth,the cement can:

A)dissolve out from under the crown, which then may be lost or swallowed.
B)irritate the area and cause inflammation and discomfort.
C)demineralize the enamel.
D)create an occlusal prematurity.

Question 17

Which are factors influencing the cementation procedure?

A)Humidity
B)Temperature
C)Mixing time
D)All of the above

Question 18

The dental assistant may have the responsibility of placing the mixed cement into the casting.The cement should be loaded:

A)into the casting until it is overflowing.
B)so that a thin lining covers all internal walls of the casting.
C)to the top margin of the crown so that it is full.
D)only on the very bottom of the crown.

Question 19

When dispensing most cement,generally the powder should be _______ before dispensing.

A)packed
B)fluffed
C)measured
D)both b and c

Question 20

Which of the following will not minimize the loss of water from evaporation when working with dental cements?

A)Dispensing powder first and then liquid
B)Dispensing the liquid first and then powder
C)Dispense liquid when it is time to mix the cement
D)Keeping the lid on the liquid

Question 21

When removing cement from a casting,never:

A)use a explorer.
B)use a firm fulcrum.
C)move instruments in a horizontal direction.
D)pull excess cement down away from the casting.

Question 22

The provisional should be lined with ZOE cement when being placed for temporary coverage.

Question 23

Which type(s) of cements can be light-cured?

A)Composite resin
B)Glass ionomer
C)ZOE
D)Both a or b

Question 24

Which cement is the most acidic and irritating to the pulp?

A)Zinc phosphate
B)ZOE
C)Composite resin
D)Glass ionomer

Question 25

Polycarboxylate cement is starting to set if it appears:

A)stringy or weblike.
B)glossy.
C)powdery.
D)all of the above.

Question 26

If used as a base zinc phosphate requires the use of a liner first.

Question 27

Which is not true of the preparing the tooth for a composite resin cementation?

A)Etch enamel and dentin for 15 seconds.
B)Rinse completely.
C)Blot the tooth with a cotton pellet.
D)Dry the tooth completely.

Question 28

Properly mixed glass ionomer cement should have a glossy appearance.

Question 29

Which is the correct cementing consistency for zinc phosphate cement?

A)The cement should be soupy.
B)The cement should string up and break about 1 inch from the slab.
C)The mix should be slightly tacky.
D)The mix should form in a ball.

Question 30

Before cementing a porcelain crown,the internal surface of the crown is:

A)roughened with air abrasion.
B)roughened with pumice.
C)moistened.
D)polished.

Question 31

Which of the following will not help to dissipate heat when mixing zinc phosphate cement?

A)Mixing on a cool glass slab
B)Adding small increments
C)Spatulate over a large area of the slab
D)Mixing quickly

Question 32

A cement frequently used for cementing provisional coverage is:

A)type I .
B)type II ZOE.
C)composite resin.
D)glass ionomer.

Question 33

Which is not an advantage of using glass ionomer in premeasured capsules?

A)Consistent results can be produced.
B)They can be triturated to eliminate mixing.
C)They are more convenient.
D)Results can vary.