Deck 7: Cements

Question 1

Compomer cement is indicated for cementation of which of the following types of restorations?

A) Ceramic-metal crowns
B) Traditional all-ceramic inlays
C) Traditional all-ceramic crowns
D) A, B, and C
E) A and C

Answer 1

Ceramic-metal crowns

Question 2

Which of the following high-strength bases has the highest modulus of elasticity?

A) Glass ionomer
B) Zinc phosphate
C) Zinc polycarboxylate
D) Resin-modified glass ionomer

Answer 2

Zinc phosphate

Question 3

Which of the following statements is true of the manipulation of zinc polycarboxylate cement?

A) The proper consistency is creamy.
B) The liquid is added to the powder.
C) The mixing time is about 3 minutes.
D) The cement should be mixed over a large area of the mixing surface.

Answer 3

The proper consistency is creamy.

Question 4

The hybrid ionomer cement liquid should be dispensed by holding the vial _____ to the mixing pad. The cement is applied to a _____ tooth.

A) at an angle; dry
B) at an angle; slightly moist
C) vertically; dry
D) vertically; slightly moist

Question 5

Which of the following statements is(are) true regarding glass ionomer cements?

A) Fluoride may be added to the powder for an anticariogenic effect.
B) Some retention is gained through chemical bonding as well as mechanical bonding.
C) A calcium hydroxide base is not recommended when glass ionomer cement is used in a deep cavity.
D) A, B, and C are all true statements.
E) A and B are both true statements.

Question 6

Cements are generally hard, brittle materials formed when a powdered _____ is mixed with a liquid.

A) quartz
B) monomer
C) acrylic resin
D) oxide or glass

Question 7

Which solvent is useful for removal of set zinc oxide-eugenol cement?

A) Ether
B) Water
C) Orange oil
D) Turpentine
E) Ethyl alcohol

Question 8

What is the recommended mixing time for glass ionomer cement?

A) 10 to 20 seconds
B) 20 to 30 seconds
C) 30 to 60 seconds
D) 2 minutes
E) 7 minutes

Question 9

Which of the following statements is true of hybrid ionomer cements?

A) They are oil-based cements.
B) They are resin-modified zinc polycarboxylate cements.
C) They may be used for cementation of zirconia-based all-ceramic crowns and bridges.
D) They are recommended for cementation of lower strength all-ceramic inlays, onlays, or crowns.

Question 10

Effective thermal protection requires that a base be at least _____ mm thick.

A) 0.05
B) 0.5
C) 1.5
D) 5

Question 11

Which of the following statement(s) is/are true of zinc polycarboxylate cement?

A) It is stronger than zinc phosphate cement.
B) It is less irritating to the pulp than zinc phosphate cement.
C) It is more irritating to the pulp than zinc phosphate cement.
D) A and B are both true.
E) A and C are both true.

Question 12

Which type of cement, used for final cementation, has the highest compressive strength?

A) Compomer
B) Glass ionomer
C) Zinc phosphate
D) Hybrid ionomer
E) Zinc polycarboxylate

Question 13

Which of the following is oil-based cement?

A) Glass ionomer
B) Hybrid ionomer
C) Zinc oxide-eugenol
D) Zinc polycarboxylate

Question 14

Which type of cement has a powder composed of aluminosilicate glass?

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

Question 15

The maximum working time for zinc polycarboxylate cement is _____ seconds.

A) 30
B) 60
C) 90
D) 120

Question 16

Which of the following cements is not water based?

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

Question 17

Which of the following is a strong cement that may be used for permanent restorations such as crowns and bridges?

A) Varnish
B) Calcium hydroxide
C) Zinc polycarboxylate
D) Unreinforced zinc oxide-eugenol
E) Unreinforced zinc oxide-noneugenol

Question 18

Which type of cement is composed of dimethacrylate resin and glass filler?

A) Zinc polycarboxylate
B) Zinc oxide-eugenol
C) Zinc phosphate
D) Glass ionomer
E) Esthetic resin

Question 19

What is the purpose of cooling the glass mixing slab when mixing glass ionomer cement?

A) Slow the setting reaction.
B) Accelerate the setting reaction.
C) Incorporate water into the mix.
D) Allow more powder to be incorporated into the liquid.

Question 20

Which of the following cements has a sedative effect on the pulp?

A) Glass ionomer
B) Zinc phosphate
C) Calcium hydroxide
D) Zinc oxide-eugenol
E) Zinc polycarboxylate

Question 21

Direct and indirect bonding of orthodontic brackets is accomplished primarily with the use of _____ cements.

A) calcium hydroxide
B) zinc phosphate
C) glass ionomer
D) compomer
E) resin

Question 22

Which cement shows histologic reactions similar to zinc polycarboxylate cement?

A) Resin-modified ionomer
B) Zinc oxide-eugenol
C) Glass ionomer
D) Zinc phosphate

Question 23

Why is rosin, 29%, added to Type I zinc oxide-eugenol cement powder?

A) Reduce brittleness
B) Act as a sedative
C) Accelerate set
D) A and C are correct.

Question 24

When would an adhesive resin cement not be used?

A) Indirect esthetic restoration
B) Metal ceramic crown
C) Alloys
D) All of the above
E) A and B only

Question 25

Which of the following cements is used for pulp capping?

A) Zinc polycarboxylate
B) Zinc oxide-eugenol
C) Calcium hydroxide
D) Zinc phosphate
E) Glass ionomer

Question 26

When are hybrid ionomer cements used?

A) To cement all-ceramic restorations
B) To cement core buildups
C) To bond orthodontic appliances
D) All of the above

Question 27

Which of the following materials used as bases is supplied as a single-paste compule that does not require mixing?

A) Compomer
B) Glass ionomer
C) Zinc phosphate
D) Hybrid ionomer
E) Zinc polycarboxylate

Question 28

Which of the following is not a water-based cement?

A) Glass ionomer
B) Hybrid ionomer
C) Zinc oxide-eugenol
D) Zinc polycarboxylate

Question 29

Which cement is closest to glass ionomer in compressive and tensile strength?

A) Zinc polycarboxylate
B) Zinc oxide-eugenol
C) Hybrid ionomer
D) Adhesive resin

Question 30

Zinc oxide-eugenol cement is a single paste system. Zinc oxide-eugenol cements should be mixed with a plastic spatula.

A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is incorrect; statement 2 is correct.
C) Statement 1 is correct; statement 2 is incorrect.
D) Statement 1 is incorrect; statement 2 is incorrect.

Question 31

What is the main function of dental cements?

A) Insulate the pulp.
B) Reinforce missing tooth structure.
C) Retain restorations on prepared teeth.
D) Initiate formation of reparative dentin.

Question 32

Which materials may be used as a base for composites but not with traditional ceramics?

A) Compomer
B) Zinc phosphate
C) Hybrid ionomer
D) A, B, and C
E) A and C

Question 33

Why are varnishes and cavity liners used prior to placing a direct restoration?

A) Function as a protective barrier between dentin and the restorative material
B) Minimize the ingress of oral fluids at the restoration-tooth interface
C) Protect the pulp from the high pH of calcium hydroxide
D) A, B, and C are correct.
E) Only A and B are correct.

Question 34

Which of the following cements exhibits and exothermic reaction?

A) Compomer
B) Glass ionomer
C) Zinc phosphate
D) Zinc oxide-eugenol
E) Zinc polycarboxylate

Question 35

Orthodontic bands may be cemented with which of the following cement(s)?

A) Glass ionomer
B) Zinc phosphate
C) Zinc oxide-eugenol
D) A and B
E) B and C

Question 36

Properties of zinc polycarboxylate cement include which of the following?

A) Moderate strength
B) High viscosity
C) Mild acidity
D) All of the above
E) Only A and C

Question 37

Which of the following cements is used in order to stimulate the formation of reparative dentin?

A) Zinc phosphate
B) Hybrid ionomer
C) Calcium hydroxide
D) Zinc oxide-eugenol
E) Zinc polycarboxylate

Question 38

When are esthetic resin cements used?

A) Fill root canals
B) Bond metal restorations
C) Bond ceramic restorations
D) Bond orthodontic brackets

Question 39

Why are varnishes used?

A) Reduce leakage around margins and walls of the restoration-tooth interface
B) Insulate the pulp from deep or large restorations
C) Stimulate the formation of reparative dentin
D) Function as a therapeutic base

Question 40

Self-adhesive resin cements eliminate the need for primer and bond. They are as strong as adhesive resin cements.

A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is incorrect; statement 2 is correct.
C) Statement 1 is correct; statement 2 is incorrect.
D) Statement 1 is incorrect; statement 2 is incorrect.

Question 41

Compare and contrast high-strength bases, liners, and varnishes.

Question 42

When is it recommended to use glass ionomer cements?

A) Cavity liner
B) Thermal base
C) Cervical Cl V restorations
D) Cement orthodontic bands

Question 43

Which of the following is correct regarding esthetic resin cements?

A) Radiopaque
B) Chemical cure
C) Low bond strength
D) High film thickness

Question 44

Which cement is used for provisional posterior restorations?

A) Zinc phosphate
B) Calcium hydroxide
C) Zinc oxide-eugenol
D) Zinc polycarboxylate

Question 45

Which of the following is correct about root canal sealers?

A) Zinc oxide-eugenol based
B) Short working time
C) High solubility
D) Radiolucent

Question 46

Which cement can be mixed to a luting consistency or to a ball consistency?

A) Zinc phosphate
B) Glass ionomer
C) Calcium hydroxide
D) Zinc oxide-eugenol

Question 47

Explain how water-based cements differ from oil-based cements.