Dental Materials MCQs

Option A: High strength

Option B: Sets quickly

Option C: Needs no squeezing of excess mercury

Option D: Greater plasticity and adapts well to cavity walls

Correct Answer: Greater plasticity and adapts well to cavity walls ✔

Option A: Accelerated corrosion

Option B: Fracture of the restoration

Option C: Merginal damage

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Reduces contraction

Option B: Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgam

Option C: Decreases creep

Option D: Gives al dull and crumbly amalgam

Correct Answer: Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgam ✔

Option A: Direct contact with the mercury

Option B: Inhalation of mercury vapours

Option C: Ingestion of mercury

Option D: None of the above

Correct Answer: Inhalation of mercury vapours ✔

Option A: mg / m3

Option B: 0.05 mg / m3

Option C: mg / m3

Option D: mg / m3

Correct Answer: mg / m3 ✔

Option A: Sulphides of silver

Option B: Oxides of tin

Option C: Chlorides of tin

Option D: All of the above

Correct Answer: Sulphides of silver ✔

Option A: Silver / Mercury phase

Option B: Silver / Tin phase

Option C: Tin / Mercury phase

Option D: Zinc / Mercury phase

Correct Answer: Silver / Tin phase ✔

Option A: 6%

Option B: 12-30%

Option C: 29%

Option D: 19%

Correct Answer: 6% ✔

Option A: Lathe cut

Option B: Spherical

Option C: Admixed

Option D: Single composition

Correct Answer: Single composition ✔

Option A: Silicate

Option B: Amalgam

Option C: Composite

Option D: Gold

Correct Answer: Amalgam ✔

Option A: 24 hours

Option B: 1-2 days

Option C: 3-5 days

Option D: 7 days

Correct Answer: 3-5 days ✔

Option A: 10-12%

Option B: 0-6%

Option C: 13-30%

Option D: 20-30%

Correct Answer: 13-30% ✔

Option A: One to two minutes

Option B: Three to four minutes

Option C: Five to six minutes

Option D: Seven to eight minutes

Correct Answer: Three to four minutes ✔

Option A: Better handling property

Option B: Dimensional Stability

Option C: Resistance to creep

Option D: Toxicity to pulp and dentin

Correct Answer: Better handling property ✔

Option A: Tarnish

Option B: Tarnish and corrosion

Option C: Wet corrosion

Option D: Dry corrosion

Correct Answer: Tarnish ✔

Option A: Marginal breakdown

Option B: Shrinkage

Option C: Delayed expansion

Option D: increased stresses

Correct Answer: Delayed expansion ✔

Option A: Gamma 1

Option B: Gamma 2

Option C: Gamma 1 and 2

Option D: No phase is eliminated

Correct Answer: Gamma 2 ✔

Option A: Mulling

Option B: Carving

Option C: Condensation

Option D: Trituration

Correct Answer: Condensation ✔

Option A: Less condensing force is required

Option B: More condensing force is required

Option C: Both require same condensing force

Option D: Manipulation is easy

Correct Answer: Less condensing force is required ✔

Option A: Ingestion while removing old amalgam

Option B: Skin contact

Option C: Mercury vapour

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Cause fracture of the filling

Option B: Tarnish and corrosion

Option C: Increase the strength

Option D: Decrease condensation pressure

Correct Answer: Cause fracture of the filling ✔

Option A: It has increased tensile and compressive strength

Option B: It has poor tarnish and corrosion resistance

Option C: It’s edge strength is greater

Option D: Mercury content in the final restoration is less

Correct Answer: It has poor tarnish and corrosion resistance ✔

Option A: Require more mercury

Option B: Require heavy compection forces

Option C: Have longer setting times

Option D: None of the above

Correct Answer: None of the above ✔

Option A: Gamma 1

Option B: Gamma 2

Option C: Epsilon 1

Option D: Gamma 3

Correct Answer: Gamma 2 ✔

Option A: 65% silver, 32% tin and 3% copper

Option B: 49% silver, 32% tin and 19% cooper

Option C: 65% silver, 29% tin and 5-6% copper

Option D: None of the above

Correct Answer: 65% silver, 29% tin and 5-6% copper ✔

Option A: At the margin of the restoration

Option B: In the centre of the restoration

Option C: In the deepest part of the restoration

Option D: None of the above

Correct Answer: At the margin of the restoration ✔

Option A: Lysing amalgam alloy

Option B: Mixing of amalgam alloy and mercury

Option C: Removal of excess of mercury

Option D: None of the above

Correct Answer: Mixing of amalgam alloy and mercury ✔