Deck 14: Dental Cement

Question 1

Which of the following cements should not be used under composites or as temporary cement before final cementation with hybrid glass ionomer or resin cements?

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

Answer 1

Zinc oxide eugenol cement

Question 2

Try-in paste is used to:

A) tack the restoration in place to check the shade of the final product.
B) bond orthodontic brackets.
C) verify proper seating of crowns.
D) cement posts before restorative treatment.

Answer 2

tack the restoration in place to check the shade of the final product.

Question 3

Which cement should be removed with alcohol or orange solvent once it has set?

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

Answer 3

Zinc oxide eugenol

Question 4

In most cases,cements have ______ strength and ______ solubility when compared with other restorative materials.

A) superior;high
B) superior;low
C) inferior;high
D) inferior;low

Question 5

The margins of indirect restorations using ______ cements should be coated with a coating agent or varnish to protect them from moisture during the setting time.

A) glass ionomer
B) zinc phosphate
C) zinc oxide eugenol
D) zinc polycarboxylate

Question 6

Which of the following cements is used as a direct pulp-capping agent when very small exposures of the pulp are suspected?

A) Cavity varnish
B) Zinc phosphate
C) Calcium hydroxide
D) Zinc oxide eugenol

Question 7

By placing a ______ provisional restoration,the dentist is able to evaluate the response of the pulp before the reappointment for a permanent restoration.

A) varnish
B) luting
C) buildup
D) sedative

Question 8

Which of the following cements forms a chemical bond to tooth structure?
1)Zinc oxide eugenol
2)Zinc phosphate
3)Zinc polycarboxylate
4)Glass ionomer

A) 1,2,3,4
B) 2,3,4
C) 2,3
D) 3,4

Question 9

Which of the following is true concerning the properties of zinc polycarboxylate cements?

A) The polyacrylic acid in zinc polycarboxylate cements produces significant pulpal irritation and the pulp must be protected.
B) The viscosity of zinc polycarboxylate cements is lower than that of most other cements.
C) These cements have higher compressive strength and lower solubility when compared with other cements.
D) The retention of polycarboxylate cements is both chemical and mechanical,making these cements desirable for retention of indirect restorations.

Question 10

Which cement is recommended for metal-free restoration?

A) Glass ionomer cement
B) Resin-based cement
C) Hybrid ionomer cement
D) Resin-modified glass ionomer cement

Question 11

Which of the following cements is highest in mechanical strength?

A) Resin cement
B) Hybrid ionomer
C) Zinc polycarboxylate
D) Glass ionomer cement

Question 12

Why are high-strength bases placed in a thickness of 0.75 mm or greater?

A) Are identifiable on dental radiographs
B) Stimulate the formation of reparative dentin
C) Will not crack or shrink during setting
D) Provide protection from the thermal conduction of metal restorations

Question 13

______ incorporation of zinc phosphate powder into the liquid and mixing over a ______ area of a cooled glass slab are recommended because the chemical reaction is exothermic and produces heat.

A) Bulk;large
B) Bulk;small
C) Incremental;large
D) Incremental;small

Question 14

Which of the following statements is true concerning the acidity of zinc phosphate cement?

A) Zinc phosphate cement has a high acidity throughout the time of service.
B) Zinc phosphate cement is incompatible with dentin bonding systems.
C) Pulpal protection is not recommended in deep cavity preparations when zinc phosphate cement is used,as the low acidity soothes the pulp.
D) The acidity of zinc phosphate cement is initially low but becomes neutral within 24 to 28 hours.

Question 15

The composition of hybrid ionomer cement is similar to that of glass ionomer cement,but it is modified with the addition what?

A) Zinc
B) Resin
C) Fluoride
D) Orange oil

Question 16

Which type of cement is recommended for cementing thicker ceramic restorations where light would not penetrate adequately?

A) Sedative
B) Dual-cure
C) Provisional
D) Chemical-cure

Question 17

Expansion of ______ cement as it absorbs moisture after setting is a concern,making the cement less desirable for cementation of all-ceramic indirect restorations because of the risk of fracture.

A) glass ionomer
B) zinc phosphate
C) zinc polycarboxylate
D) resin-modified glass ionomer

Question 18

When is zinc polycarboxylate cement no longer usable?

A) Has a creamy appearance
B) Loses its gloss and becomes stringy
C) Is mixed for longer than 10 seconds
D) Becomes oily on the surface because of the oxygen-inhibited layer

Question 19

The addition of powder to dental cement to create a secondary consistency increases the ______ of the cement.
1)viscosity
2)solubility
3)strength

A) 1,2,3
B) 1,2
C) 1,3
D) 2

Question 20

For which of the following cements is the powder dispensed in four to six portions on one end of a glass slab,and then incorporated in small increments into the liquid,with each increment mixed for 10 to 15 seconds?

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

Question 21

When cement is mixed to deliver a permanent crown,the mixture should be mixed:

A) to a firm ball stage.
B) very thin and runny.
C) sticky but not too dry.
D) to a luting consistency.

Question 22

Match the items with the correct description below.
Base/High-strength base

A)A thin layer of material placed to protect the tooth from the components of dental materials and microleakage,stimulate reparative dentin,or act as a pulp capping
B)A thin layer placed on the floor and walls of the preparation to seal tubules and minimize microleakage
C)A thick layer of cement used to protect the tooth from chemical and thermal irritation
D)Thick,putty-like,condensable material that can be rolled into a ball or rope,suitable for use as a base
E)Less viscous,flows easily,can be drawn to a 1-inch string with a spatula,suitable for luting

Question 23

A major concern regarding many cements is their pH.What is the reason for this concern?

A) Acids in the mixture
B) Chemical reactions
C) Preservatives
D) None of the above

Question 24

What is an advantage of a resin-based cement?

A) Is water soluble
B) Bonds with dentin
C) Has a high viscosity
D) Won't cause sensitivity

Question 25

What is the primary purpose of calcium hydroxide?

A) Promote reparative dentin
B) Act as a protective barrier
C) Insulate the pulp cavity
D) Sedate the pulp tissue

Question 26

Which of the following would not be used as pulpal protection under a restoration?

A) Varnish
B) Resin cement
C) Low-strength liner
D) High-strength base

Question 27

What must be done to lower the setting time of certain cements?

A) Add more catalyst.
B) Lower the slab temperature.
C) Increase the slab temperature.
D) Setting times should not be altered.

Question 28

Which of the following would not be a reason to place a high-strength base?

A) Promote reparative dentin
B) Decrease thermal sensitivity
C) Increase mechanical support
D) It's condensable

Question 29

What are glass ionomer cements used for?

A) Liner
B) Base
C) Restoration
D) All of the above

Question 30

List the advantages and disadvantages of zinc oxide eugenol,zinc phosphate,zinc polycarboxylate,traditional glass ionomer,hybrid ionomer,and resin-based cements.

Question 31

Match the items with the correct description below.
Secondary consistency

A)A thin layer of material placed to protect the tooth from the components of dental materials and microleakage,stimulate reparative dentin,or act as a pulp capping
B)A thin layer placed on the floor and walls of the preparation to seal tubules and minimize microleakage
C)A thick layer of cement used to protect the tooth from chemical and thermal irritation
D)Thick,putty-like,condensable material that can be rolled into a ball or rope,suitable for use as a base
E)Less viscous,flows easily,can be drawn to a 1-inch string with a spatula,suitable for luting

Question 32

What is the advantage of using glass ionomer cement?

A) Fluoride ion
B) Low strength
C) Low solubility
D) Sedative effect

Question 33

When would a cement be mixed to a secondary consistency?

A) Cement a veneer
B) Cement a permanent crown
C) Cement an orthodontic band
D) Cement an intermediate restoration

Question 34

Match the items with the correct description below.
Varnish

A)A thin layer of material placed to protect the tooth from the components of dental materials and microleakage,stimulate reparative dentin,or act as a pulp capping
B)A thin layer placed on the floor and walls of the preparation to seal tubules and minimize microleakage
C)A thick layer of cement used to protect the tooth from chemical and thermal irritation
D)Thick,putty-like,condensable material that can be rolled into a ball or rope,suitable for use as a base
E)Less viscous,flows easily,can be drawn to a 1-inch string with a spatula,suitable for luting

Question 35

Match the items with the correct description below.
Liner/Low-strength base

A)A thin layer of material placed to protect the tooth from the components of dental materials and microleakage,stimulate reparative dentin,or act as a pulp capping
B)A thin layer placed on the floor and walls of the preparation to seal tubules and minimize microleakage
C)A thick layer of cement used to protect the tooth from chemical and thermal irritation
D)Thick,putty-like,condensable material that can be rolled into a ball or rope,suitable for use as a base
E)Less viscous,flows easily,can be drawn to a 1-inch string with a spatula,suitable for luting

Question 36

Match the items with the correct description below.
Primary consistency

A)A thin layer of material placed to protect the tooth from the components of dental materials and microleakage,stimulate reparative dentin,or act as a pulp capping
B)A thin layer placed on the floor and walls of the preparation to seal tubules and minimize microleakage
C)A thick layer of cement used to protect the tooth from chemical and thermal irritation
D)Thick,putty-like,condensable material that can be rolled into a ball or rope,suitable for use as a base
E)Less viscous,flows easily,can be drawn to a 1-inch string with a spatula,suitable for luting