Exam (elaborations)
Chapter 11. Metals and Alloys
- Course
- Dental materials
- Institution
- Dental Assisting School
Chapter 11. Metals and Alloys
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Chapter 11. Metals and Alloys1. _______ alloys are first cast but wrought
then shaped by mechanical
force into their final forms
2. noble metals are defined by
resistance to corrosion
their
3. which is a noble metal
palladium
4. which statement is truebase metals are required in dental
concerning noble and basealloys for strength, flexibility and
metals wear resistance
its resistance to corrosion / its
5. gold is used in dental alloys
yellow color
primarily because of
the ability to be mechanically
6. malleability is defined as
formed
7. silver is added to casting
prevent tarnish
alloy to
8. when a molton (liquid) alloy form / grow
freezes, crystals _____ and
______ as the material cools
9. palladium is much harder than gold
10. which statements are true den- the areas between crystals in an
alloy are tal alloy crystal structure and called grain boundaries /
a small grain grains size is generally more desirable than a
, large grain size for dental alloy properties / if an alloy is rolled into
a sheet or drawn into a wire, the grain structure takes on a fibrous
appearance (A,B and C)
11. if an alloy contains 40 wt % gold, 70 20 wt % pallidium, 10 wt
% platinum, and 30 wt % copper, the nobility would be _____
wt %
12. an alloy liquidus is defined as all of the alloy melts the
temperature at which
13. which statements are true of the the allloy with the highest
density weighs density of an alloy the most / high-density alloys
cost more
than low-density alloys, because more mass is present in any
given volume of restoration
14. according to the ADA classifi- 60 cation for dental casting
alloys, high-noble alloys must have a noble metal content of
at least
_____% by weight
15. _______ alloys are the most dif- base-metal ficult to cast and
polish of all the alloys
16. for ceramic-bonding alloys the solidus of the alloy must be HIG
than the fusion temperature o
ceramic
17. greening of ceramic may be avoided selecting an appropriate alloy / firin
by restoration at the appropriate
temperature / periodic cleaning of t
ceramic oven
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