(COMBINED) Dental Materials: Test 1 (Chapter 6, 16, 26), Dental Materials: Test 2 (Chapter 4, 5, 25), Dental Materials: Test 3 (Chapter 7, 23,14), Dental Materials Test #5 (9, 21, 22, 27, 28), Dental Materials Test 6: Ch. 13, 24, 32, 33, 34
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Course
Dental Materials
Institution
Dental Materials
(COMBINED)
Dental Materials: Test 1 (Chapter 6, 16, 26), Dental Materials: Test 2 (Chapter 4, 5, 25), Dental Materials: Test 3 (Chapter 7, 23,14), Dental Materials Test #5 (9, 21, 22, 27, 28), Dental Materials Test 6: Ch. 13, 24, 32, 33, 34
Which of the following elements is used in the highest...
(COMBINED)
Dental Materials: Test 1 (Chapter 6, 16, 26),
Dental Materials: Test 2 (Chapter 4, 5, 25),
Dental Materials: Test 3 (Chapter 7, 23,14),
Dental Materials Test #5 (9, 21, 22, 27, 28),
Dental Materials Test 6: Ch. 13, 24, 32, 33, 34
Which of the following elements is used in the highest amount in an amalgam
restoration?
(a) Tin
(b) Copper
(c) Silver
(d) Mercury
(e) Aluminum
(d) Mercury
Amalgam is strongest in __________ strength after it has set.
(a) Shear
(b) Tensile
(c) Compressive
(d) Bending
(c) Compressive
The elements composing the gamma-two (γ2) phase (the weakest and most
corrosion-prone phase) of the amalgam reaction are:
(a) Silver and tin
(b) Silver and mercury
(c) Tin and mercury
(d) Tin and tin
(c) Tin and mercury
The function of silver in the amalgam reaction is to:
(a) Reduce strength and corrosion resistance
(b) Increase strength and corrosion resistance
(c) Minimize oxidation
(d) Maximize oxidation
(b) Increase strength and corrosion resistance
Control of the mercury content during mixing and condensing of amalgam must
be carefully considered because:
(a) The higher the mercury content, the higher the
strength and the lower the marginal breakdown.
(b) The lower the mercury content, the higher the strength
and the lower the marginal breakdown.
(c) The higher the mercury content, the higher the
,strength and the greater the marginal breakdown.
(d) The lower the mercury content, the higher the strength
and the greater the marginal breakdown.
(b) The lower the mercury content, the higher the strength and the lower the marginal
breakdown.
The single most important feature that accounts for the clinical success of
amalgam restorations is:
(a) Finish and polish
(b) Marginal seal
(c) Economy
(d) Ease of manipulation
(b) Marginal seal
The manufacturers of dental amalgam control all of the following except:
(a) Alloy composition
(b) Rate of setting reaction
(c) Proper trituration technique
(d) Particle size
(c) Proper trituration technique
An amalgam restoration that has been finished and polished:
(a) Reduces the ability of plaque to adhere
(b) Resists tarnish and corrosion
(c) Will not have any voids
(d) Is more likely to have continuous margins with tooth
structure
(e) All of the above
(f) a, b, and d
(g) a, c, and d
(f) a, b, and d
In the low-copper or traditional amalgam reaction, tin reacts with mercury. In the
high-copper amalgam reaction, tin reacts with:
(a) Silver
(b) Copper
(c) Zinc
(d) Mercury
(b) Copper
The life expectancy of an amalgam restoration is indirectly related to the size of
the restoration. As the restoration increases in size, internal stresses decrease,
as does the life expectancy.
(a) The first statement is true; the second statement is false.
(b) The first statement is false; the second statement is true.
(c) Both statements are true.
(d) Both statements are false.
(a) The first statement is true; the second statement is false.
Ashley was condensing an amalgam during lab and she noticed that the triturated
amalgam had a softer, "mushy" feel.
What type of alloy did she most likely use in the mixed amalgam?
,(a) Spherical
(b) Lathe-cut
(c) Admixed
(d) Blended
(a) Spherical
Just after Jennifer triturated her amalgam, the appearance of it was "crumbly"
and dry. It already looked set. The amalgam was most likely:
(a) Mixed with an increased mercury/alloy ratio
(b) Over-triturated
(c) Properly triturated
(d) Under-triturated
(b) Over-triturated
Amalgam may be used for a variety of restorative procedures. ALL of the
following pertain to the use of amalgam EXCEPT:
(a) Good service to patients at a reasonable cost
(b) For cingulum pit areas on the lingual of anterior teeth
(c) Amalgam cores
(d) Restoring Class I, II, IV, and V caries
(d) Restoring Class I, II, IV, and V caries
It has been reported in the scientific literature that ______% of dental patients
have a TRUE mercury allergy.
(a) 0.01
(b) 0.05
(c) 0.1
(d) 1.0
(c) 0.1
The use of gold foil is limited to small restorations because of its:
(a) Short-term longevity
(b) Low strength compared to other restorative materials
(c) High cost of gold foil compared to other materials
(d) Unique handling characteristics
(b) Low strength compared to other restorative materials
The cavity prep is always ______ with amalgam, then _______ to restore anatomy.
overfilled; carved
Amalgam is BEST for what types of restorations?
Class I, II, V, VI
Starts during trituration and continues through while carving takes place ....
the setting reaction
Amalgam is not directly controlled by the dentist like composite ...
working time
Amalgam is a direct restorative material held in place by ______
mechanical retention
Two methods of amalgam alloy formation ____
1. lathe-cut alloys
2. spherical alloys
, Produce dental amalgam particles by grinding an ingot of metal to produce
fillings ....
lathe-cut alloy
Made by spraying molten metal into an inert atmosphere, the droplets cool as
they fall ....
spherical alloy
Amalgam alloy DOES NOT mean the same as ----
dental amalgam
The Ag-Sn powdered metal before it is mixed with mercury is _____
amalgam alloy
The result of mixing the powdered metal with mercury and used to restore teeth
is ______
dental amalgam
A few advantages of amalgam _____
Tough
Long Lasting
Cost Effective
Reduces Microleakage
Tightly Sealed
Works in Wet
Directly related to the size of the restoration is ____
the life expectancy
Alternatives to amalgam ....
direct gold
cements
When did the mercury toxicity controversy begin?
immediately when introduced to US ... this divided the dental community
1920's formula amalgam
GV Blacks Low Copper
1960's formula amalgam standards
high copper content (what we use today)
A process in which a solid is formed from a material dissolved in liquid ____
precipitation
Many other metals have been added to the amalgam including ____
gold palladium
indium
mercury
Stronger, corrosion and marginal breakdown reduced
High copper alloy
Mix of two kinds of particles for admix high copper
Blended
Dispersion
Lathe-cut and spherical particles in _____
admix high copper amalgams
Single composition particles in ___
spherical high copper amalgams
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