DM Ch 10 & 14 Flashcards
In an amalgam restoration, which of the following elements has the greatest effect on reduction of corrosion?
Copper (Cu)
In the amalgam restoration, the two main components are?
Silver & Mercury
Why should all remnants of amalgam be removed from the placement instruments before they are autoclaved?
The heat causes mercury vapor to be released from the amalgam
The strength of the amalgam restoration can be affected by:
Over-trituration, under-trituration, corrosion
A properly mixed amalgam should appear:
As a homogenous mass with a slight shine
Scrap amalgam should be:
Stored in a sealed container
With high-copper alloys, which metal reacts with copper to reduce gamma-2 phase corrosion?
Tin
The fact that mercury makes up almost half of amalgam has caused concerns about:
Its safety for patient use
Risks to the office staff
Environmental effect of improper disposal of amalgam waste
Amalgam has been popular for restoration of carious teeth because
It is economical
It has excellent physical properties
It is easy to manipulate
For best mercury hygiene practices, which type of flooring is preferred for the dental operatory?
Seamless vinyl
How does tarnish differ from corrosion?
Tarnish occurs only on the surface
Which one of the following amalgam mixes has the least resistance to condensation pressure?
Spherical high-copper
Delayed expansion amalgam is caused by contact of water with which component of amalgam?
Zinc
Polishing of amalgam should be done:
With a light pressure using water as coolant
Amalgam is strongest in which of the following?
Compression
Cements mixed to primary consistency are used for:
Luting and low-strength bases
It may be necessary to place an insulating base under restorations to:
Protect the pulp from sudden temperature changes
The test for properly mixed luting cement is:
Checking whether cement will hold a thin string, breaking when the spatula is raised an inch.
Which cement should not be used for temporary cementation of crowns to be permanently cemented with resin cements?
Zinc oxide eugenol (ZOE)
Which cement exhibits an exothermic reaction during mixing?
Zinc Phosphate
Which dental cements used the bonding procedure before placement of the dental cement?
Composite resin and glass ionomer
When luting a crown, it is important to:
Have a film thickness that allows for complete seating
Many cements should not be dispensed until ready to mix because of:
Dehydration from exposure to air
Contamination from moisture in the air
Materials coming in contact with each other
Which dental cements bonds to dentin, is “kind” to the pulp, and resists recurrent decay?
Glass Ionomer
Zinc phosphate cement is mixed over a large are of the glass slab to:
Help lengthen the working time
Help neutralize the chemicals
Help dissipate the exothermic reaction
Proper instrumentation against cement margins includes:
Avoiding gouging or ditching cement margins
Light-cured cements may be used for:
Nonmetal orthodontic retainers
Porcelain veneers less than 1.5mm thick
Which element should not be used under a composite restoration because of the oil content of the liquid?
Zinc Oxide Eugenol (ZOE)
Adhesion is a molecular attraction between:
Different molecules
The latest generation of adhesion system incorporates a:
1-step system
