DM Ch 10 & 14

Question 1

In an amalgam restoration, which of the following elements has the greatest effect on reduction of corrosion?

Answer 1

Copper (Cu)

Question 2

In the amalgam restoration, the two main components are?

Answer 2

Silver & Mercury

Question 3

Why should all remnants of amalgam be removed from the placement instruments before they are autoclaved?

Answer 3

The heat causes mercury vapor to be released from the amalgam

Question 4

The strength of the amalgam restoration can be affected by:

Answer 4

Over-trituration, under-trituration, corrosion

Question 5

A properly mixed amalgam should appear:

Answer 5

As a homogenous mass with a slight shine

Question 6

Scrap amalgam should be:

Answer 6

Stored in a sealed container

Question 7

With high-copper alloys, which metal reacts with copper to reduce gamma-2 phase corrosion?

Answer 7

Tin

Question 8

The fact that mercury makes up almost half of amalgam has caused concerns about:

Answer 8

Its safety for patient use
Risks to the office staff
Environmental effect of improper disposal of amalgam waste

Question 9

Amalgam has been popular for restoration of carious teeth because

Answer 9

It is economical
It has excellent physical properties
It is easy to manipulate

Question 10

For best mercury hygiene practices, which type of flooring is preferred for the dental operatory?

Answer 10

Seamless vinyl

Question 11

How does tarnish differ from corrosion?

Answer 11

Tarnish occurs only on the surface

Question 12

Which one of the following amalgam mixes has the least resistance to condensation pressure?

Answer 12

Spherical high-copper

Question 13

Delayed expansion amalgam is caused by contact of water with which component of amalgam?

Answer 13

Zinc

Question 14

Polishing of amalgam should be done:

Answer 14

With a light pressure using water as coolant

Question 15

Amalgam is strongest in which of the following?

Answer 15

Compression

Question 16

Cements mixed to primary consistency are used for:

Answer 16

Luting and low-strength bases

Question 17

It may be necessary to place an insulating base under restorations to:

Answer 17

Protect the pulp from sudden temperature changes

Question 18

The test for properly mixed luting cement is:

Answer 18

Checking whether cement will hold a thin string, breaking when the spatula is raised an inch.

Question 19

Which cement should not be used for temporary cementation of crowns to be permanently cemented with resin cements?

Answer 19

Zinc oxide eugenol (ZOE)

Question 20

Which cement exhibits an exothermic reaction during mixing?

Answer 20

Zinc Phosphate

Question 21

Which dental cements used the bonding procedure before placement of the dental cement?

Answer 21

Composite resin and glass ionomer

Question 22

When luting a crown, it is important to:

Answer 22

Have a film thickness that allows for complete seating

Question 23

Many cements should not be dispensed until ready to mix because of:

Answer 23

Dehydration from exposure to air
Contamination from moisture in the air
Materials coming in contact with each other

Question 24

Which dental cements bonds to dentin, is “kind” to the pulp, and resists recurrent decay?

Answer 24

Glass Ionomer

Question 25

Zinc phosphate cement is mixed over a large are of the glass slab to:

Answer 25

Help lengthen the working time
Help neutralize the chemicals
Help dissipate the exothermic reaction

Question 26

Proper instrumentation against cement margins includes:

Answer 26

Avoiding gouging or ditching cement margins

Question 27

Light-cured cements may be used for:

Answer 27

Nonmetal orthodontic retainers

Porcelain veneers less than 1.5mm thick

Question 28

Which element should not be used under a composite restoration because of the oil content of the liquid?

Answer 28

Zinc Oxide Eugenol (ZOE)

Question 29

Adhesion is a molecular attraction between:

Answer 29

Different molecules

Question 30

The latest generation of adhesion system incorporates a:

Answer 30

1-step system