Dental Materials MCQs

Shows Increased Flow When Kneaded With Water

Is A Thermoset Material

Warps At Room Temperature

Low Coefficient Of Thermal Conductivity

Degradation Is Presence Of Moisture

High Flow Property

Remain Distortion Free Up To 72 Hrs. Pouring Can Be Safely Delayed

Low Thermal Conductivity

Formation Of Cross Linkage With Heating

Crystalline Structure

Low Thermal Conductivity

High Fusion Temperature

A And B

Condensation Polysillicon

Polyether

Addition Polysilicon

Inhomogeneous Colour

Porosity

Distortion

Increased Strength

Hard thick central area

Thin area of flanges

Thin Palatal area

Porosity is uniformly distributed

Matching Of Coefficients Of Thermal Expansion Of Ceramics And Alloy

All Of The Above

Low Fusing Ceramic And High Fusing Alloys

Bonding Between Ceramic And Alloy

Moisture Absorption

All Of The Above

Temperature Lag Between Gelation And Liquefaction Temperature

Phenomenon Of Conversion Of Gel Into Sol

Condensation Silicones

Polysulfides

Polyether

Addition Silicones

To Prevent Polymerization During Storage

To Enable Polymerization Reaction At Room Temperature

To Initiate Release Of Free Radicalls

All Of The Above

Imbibition

Hysterisis

Recrytallisation

Syneresis

1-2 Days

7 Days

3-5 Days

24 Hours

Maximum Matrix And Minimum Alloy Phase

Minimum Matrix And Maximum Alloy Phase

Maximum Matrix Phase

Minimum Alloy Phase

Have Less Marginal Breakdown

Are Workable At Lower Hg-Alloy Ratio

Have A Higher Ratio Of Tensile To Compressive Strength

Have Less Resistance To Tarnish And Corrosion

From Irregular And Spherical Particles

From Traditional Alloy Particles

From Smooth Atomized Particles

From Lathe Cut Particles

Silicone

A And B

Reversible Hydrocolloid

Mercaptan

Heating Upto 250°C For 15 To 30 Min

Heating At 750°C And Then Quenching To Room Temperature

Heating Quickly Upto 450°C Followed By Sudden Quenching

Heating 750°C And Slowly Cooling To Zero Degree

Rhn

Vhn

Bhn

Knh

Impression Compound

Hydrocolloid

Elastomer

Zinc Oxide Eugenol

Impression Plaster

Model Plaster

Die Stone

Stone Plaster

Die

Casts

Casts And Dies

Impressions

1,063°C

700°C

1,300°C

900°C

Vaporization Of Silver From The Walls Of Contaminated Furnaces

Silver Ionization By Porcelains With High Oxygen Potential

More Rapid Silver Diffusion In Sodium Containing Glass

Surface Diffusion Of Silver From The Marginal Metal

Strength Of Dental Stone Due To Green Colour

The Wet Strength

Compressive Strength

Dry Strength

100%

25%

75%

50%