give reason intermetallic compound is brittle

The atoms combine in a definite

proportions in definite position in space

lattice → No chance for atomic displacemen

zinc is added during the manufacturing of dental amalgam alloy to act as

scavenger for oxides during manufacturing (De- oxidizer)

dental amalgam can be used for all of the following clinical applications except

Core material in extensively broken tooth

give reason mixing mercury with dental amalgam alloy

as it is Responsible for amalgamation reaction to form workable mass

presence of silver decrease corrosion, while presence of copper increase corrosion resistance

first statement is true, second statement is false

first statement is false,second statement is true

mention characters of dental mercury

Triple distilled → High degree of purity. (<0.02% non volatile residue

give reason, Maximize the core & minimize the matrix By adding Hg only enough

➢ Wetting the alloy particles →

➢ Set into set coherent solid mass

ENUMERATE advantages of amalgam capsules

➢ This ensures an accurate ratio.

➢ No Hg spills during proportioning.(Hygienic)

give reason lathe cut alloy particles requires more mercury

Because of the larger surface area / volume

All of the following are TRUE about spherical alloys except

Take less Hg to form workable mix.

More plastic allowing it to be condensed more easily

spherical alloy particles have adequate proximal contact, while lathe cut alloy particles have poor proximal contact

first statement is true, second statement is false

first statement is false, second statement is true

Enumerate disadvantages of Silver consolidated

Difficult to compact it ▪ Laborious ▪ Time consuming

mention indication of zinc free amalgam

no moisture control during manipulation

mention role indium as an additive to High Copper Amalgam Alloy

▪ ↓Hg required to wet the alloy

enumerate disadvantages of gallium based alloys

Difficult to handle because it is sticky

enumerate indications of bonded amalgam

1. Treatment option for extensively carious posterior teeth,

with a lower cost than either cast metal restorations or

2. Use of amalgam in teeth with low gingivo- occlusal

enumerate disadvantages of bonded amalgam

2. It increases the cost of the amalgam

4. It requires practitioner to adapt to the

Eutictic alloy is present in

Unicompositional high copper amalgam

Lowest strength and highest creep are present in

Spherical unicompositional high copper amalgam

Give reason high copper amalgam is preferred than low copper

As it has higher strength properties,higher corrosion resistance,lower creep

Material Amalgam part 1

•

43 Qs

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Material Amalgam part 1

Quiz

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others

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Practice Problem

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Hard

Alaa Hany

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43 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a characteristic of high copper amalgam

Produce excessive creep

Better corrosion resistance than low copper

Low strength

Contain both y1 and y2 in its final microstructure

FILL IN THE BLANK QUESTION

30 sec • 1 pt

Mention indications of direct gold filling

FILL IN THE BLANK QUESTION

30 sec • 1 pt

Give reason, The pellet or foil of direct gold filling is degassed in pure ethanol flame

FILL IN THE BLANK QUESTION

30 sec • 1 pt

Enumerate advantages of direct gold filling

FILL IN THE BLANK QUESTION

30 sec • 1 pt

Enumerate disadvantages of direct gold filling

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

it is a Chemical reaction between the special alloy & Hg at room temperature.

Amalgamation reaction

chelation reaction

gelation reaction

none of the above

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Dental amalgam: consists of

Mercury (Hg) (Main constituent) + Any metal or alloy

Special alloy = Ag3Sn + Copper Cu + Zinc Zn

Special alloy + Hg

none of the above

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Material Amalgam part 1

43 questions

Which of the following is a characteristic of high copper amalgam

Mention indications of direct gold filling

Give reason, The pellet or foil of direct gold filling is degassed in pure ethanol flame

Enumerate advantages of direct gold filling

Enumerate disadvantages of direct gold filling

it is a Chemical reaction between the special alloy & Hg at room temperature.

Dental amalgam: consists of

An alloy, whose constituents are completely soluble in the molten state; but on cooling they react forming new chemical compund

give reason intermetallic compound is brittle

high copper amalgam is characterized by elimination of

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