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Chapter 10 Dental Materials - Dental Amalgam
Terms in this set (29)
A mixture of two or more metals
reaction that occurs when silver-based alloy is mixed with mercury to form an amalgam
metallic restorative material composed of silver-based alloy mixed with mercury
irregularly shaped particles formed by shaving fine particles from an alloy ingot
small spheres of alloy particles produced by spraying a fine mist of liquid alloy into an inert gas environment
mixture of lathe-cut and spherical alloys
a chemical reaction between tin in the silver-based alloy and mercury that causes corrosion in the amalgam
oxidation affecting a thin layer of a metal at its surface that does not change the metal's mechanical properties
breakdown of a metal by chemical or electrochemical reaction with substances in the environment such as water or air. It negatively impacts the properties of amalgam
gradual change in the shape of a restoration caused by compression from occlusion or adjacent teeth and can cause amalgam to bulge out of the cavity preparation
expansion of amalgam containing zinc when it is contaminated with moisture (e.g., saliva) during condensation. Inside the amalgam hydrogen gas develops from the interaction of water and zinc, and it creates an outward pressure that causes creep to occur
mechanical device used to mix silver-based alloy particles with mercury to produce amalgam
the act of pressing amalgam mix into a cavity preparation with instruments to produce a dense mass
after the amalgam mix is placed an instrument is used to further condense the amalgam surface
In an amalgam restoration, which of the following elements has the greatest effect on reduction of corrosion?
Silver and mercury
In the amalgam restoration, the two main components are _________________
The heat causes mercury vapor to be released from the amalgam
Why should all remnants of amalgam be removed from the placement instruments before they are autoclaved?
The strength of the amalgam can be affected by ___________________
As a homogeneous mass with a slight shine
A properly mixed amalgam should appear _________________
Stored in a sealed container
Scrap amalgam should be _____________________
With high-copper alloys, which metal reacts with copper to reduce gamma-2 phase corrosion?
-safety for patient use
-Risks to the office staff
-environmental effects of improper disposal of amalgam waste
The fact that mercury makes up almost half of amalgam has caused concerns about _____________________.
-excellent physical properties
-easy to manipulate
Amalgam has been popular for the restoration of carious teeth because __________________________.
For best mercury hygiene practices, which type of flooring is preferred for the dental operatory?
Tarnish occurs only on the surface
How does tarnish differ from corrosion?
Which one of the following amalgam mixes has the least resistance to condensation pressure?
Delayed expansion of amalgam is caused by contact of water with which component of amalgam?
With light pressure, using water as a coolant
Polishing of amalgam should be done ___________.
Amalgam is strongest in ________________________.
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