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OPEDENT > 14. Amalgam > Flashcards

14. Amalgam Flashcards

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1
Q

True or false

INDICATIONS of using amalgam

→ primary and permanent teeth
→ moderate to large Class I and II restorations including
restorations that involve:
o heavy occlusion
o cannot be isolated well
o extend onto the root surface

A

T

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2
Q

True or false

INDICATIONS of using amalgam

Class V restorations including restorations that are:

o not esthetically critical
o cannot be well isolated
o located entirely on the root surface

A

True

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3
Q

an alloy made by mixing mercury with a silver-tin amalgam alloy

A

DENTAL AMALGAM

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4
Q

COMPOSITION of dental amalgam

_____+ amalgam alloy = dental amalgam

A

mercury

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5
Q

COMPOSITION of dental amalgam

(Hg) + (Silver, Tin, Copper,_____) = dental amalgam

A

Zinc

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6
Q

a _______ amalgam alloy added with varying amounts of mercury and small amount of zin

A

silver-tin

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7
Q

What is the composition of amalgam alloy?

A

Silver, Tin, Copper, Zinc

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8
Q

→ 67-70%
→ strength

Silver
Tin
Copper
Zinc

A

Silver

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9
Q

→ 25-27%
→ workability and strength

Silver
Tin
Copper
Zinc

A

Tin

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10
Q

→ 6% or less (3-5%)

Silver
Tin
Copper
Zinc

A

Copper

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11
Q

→ strength and corrosion resistance

Silver
Tin
Copper
Zinc

A

Copper

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12
Q

→ maximum of 2%
→ may or may not be present

Silver
Tin
Copper
Zinc

A

Zinc

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13
Q

→ suppress oxidation

Silver
Tin
Copper
Zinc

A

Zinc

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14
Q

has the potential to be hazardous if not managed properly

A

MERCURY

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15
Q

the alloying reaction of mercury with the ______ go to completion to ensure that mercury does not diffuse into the oral
environment

A

Ag-Sn alloy

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16
Q

the critical times are when metallic mercury exists in____ or ____ form rather than bound in a set amalgam

A

liquid or
vapor

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17
Q

as a vapor, metallic mercury can be inhaled and absorbed
through the alveoli in the lungs at ____ % efficiency

A

80%

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18
Q

1:1 mercury:alloy ratio

A

MERCURY-TO-ALLOY RATIOS

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19
Q

this ratio is one portion of mercury to one portion of alloy by
weight

A

MERCURY-TO-ALLOY RATIOS

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20
Q

Eames Technique

A

MERCURY-TO-ALLOY RATIOS

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21
Q

DENTAL AMALGAM
classified according to (3)

A

(1) amalgam alloy particle geometry and size
(2) copper content
(3) zinc content

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22
Q

What are the particle type?

A

Lathe-Cut Particles

Spherical Particles

Dispersion System

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23
Q

→ regular cut, fine cut and microfine cut

A. Lathe-Cut Particles
B. Spherical Particles
C. Dispersion System

A

A

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24
Q

→ require much less mercury to make a particular mixture

A. Lathe-Cut Particles
B. Spherical Particles
C. Dispersion System

A

B

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25
the particles were packed more efficiently A. Lathe-Cut Particles B. Spherical Particles C. Dispersion System
B
26
increased the fluidity of the mixture by presenting less resistance to particle sliding A. Lathe-Cut Particles B. Spherical Particles C. Dispersion System
B
27
mixed geometries A. Lathe-Cut Particles B. Spherical Particles C. Dispersion System
C
28
dispersed alloy A. Lathe-Cut Particles B. Spherical Particles C. Dispersion System
C
29
Low-Copper Amalgam Alloy contain?
contain 2-5% copper
30
High-Copper Amalgam Alloy contain?
contain 12-30% copper
31
Low-Copper Amalgam Alloy: Ag percent?
69.4%
32
Low-Copper Amalgam Alloy: Sn %?
26.2%
33
Low-Copper Amalgam Alloy: Cu %?
3.6%
34
Low-Copper Amalgam Alloy: Zn %?
0.8%
35
High-Copper Amalgam Alloy: Ag %?
60%
36
High-Copper Amalgam Alloy: Sn %?
27%
37
High-Copper Amalgam Alloy: Cu%?
13%
38
High-Copper Amalgam Alloy: Zn %?
0%
39
ZINC CONTENT can be:
o zinc containing o non-zinc containing
40
𝐴𝑔3𝑆𝑛 + 𝐻𝑔 = 𝐴𝑔3𝑆𝑛 + 𝐴𝑔2𝐻𝑔3 + 𝑆𝑛7𝐻𝑔8
PHASES OF DENTAL AMALGAM
41
Ag3Sn
Gamma Phase
42
Ag2Hg3
Gamma 1 Phase
43
Sn7Hg8
Gamma 2 Phase
44
strongest phase
Gamma Phase
45
should occupy the maximum volume in the restoration
Gamma Phase
46
crystals are small and equiaxed
Gamma 1 Phase
47
intermediate corrosion resistance
Gamma 1 Phase
48
crystals are long and blade-like
Gamma 2 Phase
49
prone to corrosion
Gamma 2 Phase
50
results in porous spongy amalgam with mechanical resistance
Gamma 2 Phase
51
PROPERTIES OF DENTAL AMALGAM
Setting Time Plasticity Strength Creep Dimensional Change Corrosion and Tarnish Tensile Strength
52
relates to the technique employed to condense it to prepared cavity A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
B
53
True or false High plasticity requires greater condensing force
FALSE LOW plasticity requires greater condensing force
54
final strength is achieved 24 hours after placement A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
C
55
amount of Hg present in the final restoration relates to ____ A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
C
56
more than 52% of Hg results in decreased _____ A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
C
57
percentage of flow under pressure at mouth temperature A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
D
58
deformation with time in response to a constant stress A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
D
59
high copper alloy decreases corrosion A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
F
60
polishing reduces corrosion A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
F
61
loss of material at the margin A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
G
62
butt joint margin increases tensile strength A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
G
63
too high Hg content and ultrafine alloy produces low tensile strength A. Setting Time B. Plasticity C. Strength D. Creep E. Dimensional Change F. Corrosion and Tarnish G. Tensile Strength
G

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