Dental Materials MCQs

Zinc Oxide Eugenol

Resin

Gutta-Percha

Zinc Phosphate

Alginate

Zno Paste

Agar

Elastome

Infrared Light

Visible Light

Diketone

Uv Light

Increase Gel Strength

Wash Off Saliva On Impression

Prevent Distortion

Prevent Syneresis

Which Undergoes Rapid Expansion

In Which Accelerators Or Retarders Have Been Added According To Need

In Which Amount Of Water Of Hydration Is Controlled

In Which The Crystals Are All Of Uniform Size

Using Asbestos Linear

Placing The Sprue At Least One Quarter Inch Away Form The End Of Casting Ring

Using A Short And Wide Sprue

Preventing Rapid Heating The Investment In Burnout Oven

0.1 Um

30 Um

15 Um

10 Um

Alpha Form

Gamma Form

Beta Form

None Of The Above

Permit Expansion Of The World

Retard The Heating Of The Investment

Facilitate Venting Of The Mold

All Of The Above

0.15

0.2

0.1

0.05

Titanium

Chromium

Molybdenum

Germanium

Stress Relieving Heat Treatment

Hard Hardening Treatment

Soft Hardening Treatment

Precipitating Heat Treatment

Irregularities Present Between Adherent Surfaces

Rough Surfaces Between Adhesive & Adherent

Adherent And Adhesive Molecules Are Tangent To Each Other

Complete Wetting Of Surfaces

68-72%

38-42%

58-62%

48-52%

An Alloy Of Two Or More Metals That Have Been Dissolved In Each Other In The Molten State

A Metallic Powder Composed Of Silver, Tin, Copper And Zinc

A Metallic Substances In Powder Or Tablet From That Is Mixed With Mercury

An Alloy Of Two Or More Metals One Of Which Is Mercury

4 Hours

Hours

16 Hours

8 Hours

Esthetic Properties

Thermal Properties

Biological Properties

Mechanical Properties

Equal Lengths Of Base Paste And Accelerator Paste Are Mixed Together Until The Mix Has A Uniform Colour

Both (The mix appear thick at the start of mixing but after 30 seconds of additional spatulation it becomes more fluid) (Water accelerates but heat retards the setting of zinc oxide eugenol cements)

The Mix Appear Thick At The Start Of Mixing But After 30 Seconds Of Additional Spatulation It Becomes More Fluid

Increase In Temperature And Humidity Shorten The Setting Time

They Set By Condensation Polymerisation

They Exhibit A Very Low Setting Shrinkage

They Evolve Hydrogen When Cast If They Are Not Fully Cured

They Have A Lower Tear Resistance Than Polysulphide Rubbers

The Former Have Higher Residual Monomer Content

The Former Are More Porous

The Former Have A Lower Molecular Weight

The Former Have Greater Transverse Strength

They Have A Lower Proportional Limit Than Gold Alloys

They Have A Modulus Of Elasticity Twice That Of Gold Alloys

They Are More Rigid Than Gold Alloys

They Have Higher Ductility Than Gold Alloys

It Will Take Up Water And Expand If Kept Wet

It Should Be Rapidly Displaced From The Mouth

It May Exhibit Fluid Exudates On The Surface As A Result Of Imbibition Of Water

It Will Shrink As A Result Of Syneresis

Calcium Chloride

Bromoglycerine

Zinc Acetate Dehydrate

Acetic Acid

Adding A Small Amount Of Water

Cooling Mixing Slab

Adding A Small Amount Of Glycerine

Altering The Amounts Of The Two Pastes Used

It Is Not Necessary In Moderately Deep Cavities Under Glass Ionomer Restoration

Have Film Thickness Of 1 – 50 Microns

Protect The Pulp From Reaction Products Leaching Out Of Restoration

Do Not Provide Thermal Or Electric Insulation