Dental Materials MCQs

Hydrocolloid

Sol

Colloid

Gel

Glyecrol

Glutamic Acid

Glycol

Alcohol

Non-Elastic Impression Material

More Mucostatic Than Zoe

Less Mucostatic Than Zoe

Thermoplastic Impression Material

Both Can Be Re-Used For Fresh Impressions

Gelation Increase In Both On Increase In Temperature

Deformation During Removal Of Impression Occurs Due To Distortion Of Gel Fibers

Mixing Time Is Increased To Reduce The Setting Time

Improper Angulation Of Sprue

Improper Heating Of The Investment

Improper Casting Pressure

Improper Wetting Of The Wax Pattern By The Investment

Heating At 700°C For 1 Hour And Quenching In Water

Heating At 700°C For 10 – 15 Min And Quenching In Water

Heating Up To 200 – 450°C For 15 – 30 Min And Quenching In Water

Heating Above 700°C For 30 Min And Quenching In Water

Agar

Primary Impression

Both Of The Above

Alginate Impression Material

Chemicals

Bullock Heart

Sea Weed

Chick Cells

Mechanical Action Of Saliva

Chemical Change

Evolution

Physical Change

The Resultant Alloy Is Greater

The Resultant Alloy Varies According To The Content Of Ag Of Cu

None Of The Above

The Resultant Alloy Is Lesser

High Modulus Of Elasticity

High Compressive Strength

Tensile Strength

Diametral Strength

Dimensional Stability

Toxicity To Pulp And Dentin

Better Handling Property

Resistance To Creep

Low Melting Point

Low Strength

Low Weight

Low Cost

Needs No Squeezing Of Excess Mercury

Sets Quickly

Greater Plasticity And Adapts Well To Cavity Walls

High Strength

13-20% Copper

9-20% Copper

9-30% Copper

13-30% Copper

Shiny Mix

Dry Mix

Short Mixing Time

None Of The Above

Redden The Alloy

Increase Its Fusion Temperature

Decrease Its Tarnish Resistance

Decrease Its Strength And Ability To Be Hardened

12

25

1

4

1956

1937

1925

1951

Denture Base

Temporary Bridges

All Of The Above

Anterior Restorations

Produces Heat During Polymerization

Melts At 100°C

Still Requires Heat For Polymerization

Softens At 100°C

120 Seconds

30 Seconds

90 Seconds

60 Seconds

80 Mpa

510 Mpa

140 Mpa

260 Mpa

Setting Time

None Of The Above

Setting Expansion

Hardness Of The Set Product

Skin

Lungs

Kidneys

Gastro-Intestinal Track