Dental Materials MCQs

Option A: Above the proportional limit a material function in a plastic manner, while below the proportional limit it behaves as an elastic

Option B: Above the proportional limit a material functions in an elastic manner, while below the proportional limit it behaves as an plastic

Option C: Either A or B

Option D: Neither A or B

Correct Answer: Above the proportional limit a material function in a plastic manner, while below the proportional limit it behaves as an elastic ✔

Option A: Type I and Type II gold can be heat treated and annealed

Option B: Type III and Type IV gold can be heat treated and annealed

Option C: Type I and IV gold can be heat treated and annealed

Option D: All the type of gold can be heat treated and annealed

Correct Answer: Type III and Type IV gold can be heat treated and annealed ✔

Option A: Methyl methacrylate

Option B: Benzoyl peroxide

Option C: Hydroquinone

Option D: D-methyl paratolouidine

Correct Answer: Methyl methacrylate ✔

Option A: B.P of water

Option B: < B.P of water

Option C: Equal of BP of water

Option D: Is at normal room temperature

Correct Answer: B.P of water ✔

Option A: Higher solubility in saliva

Option B: Lower modulus of elasticity

Option C: Esthetic excellence

Option D: Lower thermal co-efficient of expansion

Correct Answer: Lower thermal co-efficient of expansion ✔

Option A: Resin

Option B: Filler

Option C: Resin & Filler

Option D: None

Correct Answer: Resin ✔

Option A: Anterior restorations

Option B: Temporary bridges

Option C: Denture base

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Cold water

Option B: Hot water

Option C: Under tap water

Option D: Under vacuum pressure

Correct Answer: Under vacuum pressure ✔

Option A: A prolonged curing cycle

Option B: Lack of sufficient pressure applied to flask

Option C: Insufficient acrylic resin monomer

Option D: Prolonged bench cooling after curing

Correct Answer: Lack of sufficient pressure applied to flask ✔

Option A: Glycol dimetharylate

Option B: Benzoyl peroxide

Option C: N-para toluidine

Option D: Methyl methacrylate

Correct Answer: Glycol dimetharylate ✔

Option A: To prevent polymerization during storage

Option B: To initiate release of free radicalls

Option C: To enable polymerization reaction at room temperature

Option D: All of the above

Correct Answer: To prevent polymerization during storage ✔

Option A: Diketone-amine

Option B: Organic acid-metal oxide

Option C: Organic acid-peroxide

Option D: Peroxide-amine

Correct Answer: Diketone-amine ✔

Option A: A filled resin

Option B: Colloidal silica

Option C: Gold alloy

Option D: Wax

Correct Answer: A filled resin ✔

1. Methacrylate
2. Ethylmethacrylate
3. Methyl ethyl methacrylate
4. Polymethylmethacrylate

Correct Answer: 1. Methacrylate ✔

Option A: Iritis

Option B: Cataract

Option C: Conjunctivitis

Option D: Retinal damage

Correct Answer: Retinal damage ✔

Option A: Covalent bond

Option B: Ionic bond

Option C: Mechanical

Option D: Vanderval forces

Correct Answer: Mechanical ✔

Option A: Plastic

Option B: Stainless steel

Option C: Iron

Option D: None of the above

Correct Answer: Plastic ✔

Option A: Excessive expansion

Option B: Low impact strength

Option C: Excessive shrinkage

Option D: Excessive brittleness

Correct Answer: Excessive shrinkage ✔

Option A: UV light

Option B: Visible light

Option C: Infrared light

Option D: Diketone

Correct Answer: UV light ✔

Option A: Packing at dough stage

Option B: Curing at 160°F for 9 hrs

Option C: Inadequate pressure

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Localised Shrinkage porosity

Option B: Gas inclusion porosity

Option C: Micro porosity

Option D: Surface porosity

Correct Answer: Micro porosity ✔

Option A: 0.05 to 0.04mm

Option B: 0.5 to 1.0 microns

Option C: 0.01 to 0.1 microns

Option D: 0.3 to 0.4mm

Correct Answer: 0.01 to 0.1 microns ✔

Option A: Composite

Option B: Complex material

Option C: Combined

Option D: Compound

Correct Answer: Composite ✔

Option A: Amalgam

Option B: Silicate cement

Option C: Gold alloy

Option D: Acrylic resin

Correct Answer: Acrylic resin ✔

Option A: Heat

Option B: Visible light

Option C: Chemicals

Option D: Lasers

Correct Answer: Visible light ✔

Option A: Prevent galvanic action

Option B: Are practically insoluble in oral fluids

Option C: Adapt to the walls of the cavity better

Option D: Have a higher coefficient of thermal expansion

Correct Answer: Are practically insoluble in oral fluids ✔

Option A: To prevent the porosity

Option B: To prevent warpage

Option C: To prevent volume expansion

Option D: All of the above

Correct Answer: To prevent the porosity ✔

Option A: Increase the surface area

Option B: Permit chemical bonding between resin and enamel

Option C: Create surface irregularities in enamel for better mechanical retention of resin

Option D: Condition the tooth surface for better wetting

Correct Answer: Permit chemical bonding between resin and enamel ✔

Option A: Glass ionomer restoratives

Option B: Hybrid resin composites

Option C: Microfilled resin composites

Option D: Macrofilled resin composites

Correct Answer: Microfilled resin composites ✔

Option A: Microfilled resin

Option B: Macrofilled resin

Option C: Hybrid

Option D: Light cure activated

Correct Answer: Microfilled resin ✔

Option A: Composites

Option B: Unfilled resins

Option C: Amalgam

Option D: Polycarboxylate

Correct Answer: Unfilled resins ✔

Option A: Nd:YAG

Option B: CO2

Option C: ER:YAG

Option D: Argon

Correct Answer: Argon ✔

Option A: 6%

Option B: 8%

Option C: 10%

Option D: 21%

Correct Answer: 6% ✔

Option A: Covalent bonds

Option B: sonic bonds

Option C: Vander Wall’s Forces

Option D: Hydrogen Bonds

Correct Answer: Covalent bonds ✔

Option A: Biological properties

Option B: Thermal properties

Option C: Mechanical properties

Option D: Esthetic properties

Correct Answer: Thermal properties ✔

Option A: Parabane

Option B: Ligane

Option C: Silane

Option D: Chelane

Correct Answer: Silane ✔

Option A: 4th generation bonding agents

Option B: Separate etching step not required

Option C: Separate etching step is still required

Option D: Contains only primer

Correct Answer: Separate etching step is still required ✔

Option A: Decrease micro leakage

Option B: Decrease polymerization shrinkage

Option C: Decrease coefficient of thermal expansion

Option D: Decrease porosity in restorative material

Correct Answer: Decrease micro leakage ✔

Option A: Microwave-activated resins

Option B: Tertiary amine-activated resins

Option C: Light activated resins

Option D: Heat activated resins

Correct Answer: Light activated resins ✔

Option A: 1% by volume 0.23% by weight

Option B: 10% by volume 0.23% by weight

Option C: 0.1% by volume 0.23% by weight

Option D: None of the above

Correct Answer: 1% by volume 0.23% by weight ✔

Option A: Knoop hardness number 18 to 20

Option B: Tensile strength of 60 MPa

Option C: Density of 1.13 g/cm3

Option D: Modulus of elasticity of 3.4 GPa

Correct Answer: Modulus of elasticity of 3.4 GPa ✔

Option A: Better control over placement

Option B: Enhance and concentrate the action of acid

Option C: Helps in visualization while placement

Option D: None of the above

Correct Answer: Better control over placement ✔

Option A: 25°C

Option B: 37°C

Option C: 50°C

Option D: 60°C

Correct Answer: 60°C ✔

Option A: 10 um – 20 um

Option B: 3 um – 9 um

Option C: 50 um – 110 um

Option D: 200 um – 250 um

Correct Answer: A. 10 um – 20 um ✔

Option A: 3:1

Option B: 4:1

Option C: 10:1

Option D: 5:1

Correct Answer: 3:1 ✔

Option A: 0.2% to 0.5%

Option B: 2% to 5%

Option C: 0.3% to 0.5%

Option D: 2% to 5%

Correct Answer: 2% to 5% ✔

Option A: Removes smear layer

Option B: Increases surface energy of dentin

Option C: Forms a thin resin layer over exposed collagen fibrils

Option D: Helps in bonding with composite

Correct Answer: Removes smear layer ✔

Option A: Step-growth polymerization

Option B: Addition polymerization

Option C: Condensation polymerization

Option D: Copolymerization

Correct Answer: Copolymerization ✔

Option A: Internal color

Option B: Tissue compability

Option C: Surface hardness

Option D: Craze resistance

Correct Answer: Craze resistance ✔

Option A: Thermal changes

Option B: Thickness of the resin

Option C: Lack of temperature

Option D: Packing past the dough stage

Correct Answer: Thermal changes ✔

Option A: Distortion

Option B: Porosity

Option C: Inhomogeneous colour

Option D: Increased strength

Correct Answer: Porosity ✔

Option A: Quartz

Option B: Silicates

Option C: Zinc particles

Option D: Aluminium

Correct Answer: Quartz ✔

Option A: Poor colour stability

Option B: Less polymerization shrinkage

Option C: Increase in vertical dimension

Option D: Decrease in vertical dimension

Correct Answer: Increase in vertical dimension ✔

Option A: 300 mw/sm2

Option B: 350 mw/cm2

Option C: 400 mw/cm2

Option D: 450 mw/cm2

Correct Answer: 300 mw/sm2 ✔

Option A: Tertiary amine

Option B: Benzoyl peroxide free radical

Option C: Hydroquinone

Option D: Methyl ether

Correct Answer: Benzoyl peroxide free radical ✔

Option A: Throughout the denture

Option B: Near the borders

Option C: In the thickest part

Option D: On the denture surface

Correct Answer: In the thickest part ✔

Option A: Low compressive strength

Option B: High abrasive resistance

Option C: High water absorption

Option D: High polymerization shrinkage

Correct Answer: High abrasive resistance ✔

Option A: Poor colour stability

Option B: Less polymerization shrinkage

Option C: Increase in vertical dimension

Option D: Decrease in vertical dimension

Correct Answer: Increase in vertical dimension ✔

Option A: Thermal changes

Option B: Thickness of the resin

Option C: Lack of temperature

Option D: Packing past the dough stage

Correct Answer: Thermal changes ✔

Option A: Distortion

Option B: Porosity

Option C: Inhomogeneous colour

Option D: Increased strength

Correct Answer: Porosity ✔

Option A: Quartz

Option B: Silicates

Option C: Zinc particles

Option D: Aluminium

Correct Answer: Quartz ✔

Option A: Zinc oxide

Option B: Methyl methacrylate

Option C: Phosphoric acid

Option D: Eugenol

Correct Answer: Phosphoric acid ✔

Option A: Addition of grain refining agents

Option B: Addition of difunctional monomers

Option C: Increasing the amount of heat required for linear polymerization

Option D: Incorporation of terminating agents

Correct Answer: Addition of difunctional monomers ✔

Option A: Should be held at a millimeter distance from the restoration

Option B: Need no protection while in use

Option C: Will cure composite upto a depth of 5 millimeter thickness

Option D: Is fiber optic

Correct Answer: Should be held at a millimeter distance from the restoration ✔

Option A: Toluidine

Option B: Quaternary ammonium compound

Option C: Benzoyl peroxide

Option D: Tertiary amine

Correct Answer: Tertiary amine ✔

Option A: Amalgam alloy

Option B: Unfilled resin

Option C: Composite resin

Option D: Direct filling gold

Correct Answer: Unfilled resin ✔

Option A: 1925

Option B: 1937

Option C: 1951

Option D: 1956

Correct Answer: 1937 ✔

Option A: Increased thermal conductivity

Option B: Decreased wear resistance

Option C: Decreased thermal conductivity

Option D: None of the above

Correct Answer: Decreased wear resistance ✔

Option A: 3% to 5%

Option B: 8% to 10%

Option C: 0.2% to 0.5%

Option D: 0.6% to 0.8%

Correct Answer: 0.2% to 0.5% ✔

Option A: Increases vertical dimension

Option B: Causes teeth to be shrunken in investment

Option C: Causes poor quality of colour

Option D: Causes fracture of denture

Correct Answer: Increases vertical dimension ✔

Option A: Increasing the mechanical strength

Option B: Decreasing the coefficient of thermal expansion

Option C: Reducing the polymerization shrinkage

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Polymerization shrinkage is greater if bonded surface area is lesser than unbounded surface area

Option B: Polymerization shrinkage is high if within the enamel margins

Option C: Acid etching and priming will decrease polymerization shrinkage

Option D: Microleakage can occur because of polymerization shrinkage

Correct Answer: Polymerization shrinkage is greater if bonded surface area is lesser than unbounded surface area ✔

Option A: It can be finished smoothly

Option B: It has a low degree of flow

Option C: It’s non-irritation to pulp

Option D: It’s wear resistant is high

Correct Answer: It can be finished smoothly ✔

Option A: Only Hydrophobic component

Option B: Only Hydrophilic component

Option C: Hydrophobic and hydrophilic component

Option D: Lyophillic and lyophobic component

Correct Answer: Hydrophobic and hydrophilic component ✔

Option A: TEGDMA

Option B: BIS-GMA

Option C: Ti02

Option D: None of the above

Correct Answer: Ti02 ✔

Option A: Cold water

Option B: Hot water

Option C: Under pressure

Option D: In vaccum

Correct Answer: Hot water ✔

Option A: 30 seconds

Option B: 60 seconds

Option C: 90 seconds

Option D: 120 seconds

Correct Answer: 30 seconds ✔

Option A: Compression moulding technique

Option B: Injection moulding technique

Option C: Fluid resin technique

Option D: Light cured technique

Correct Answer: Injection moulding technique ✔

Option A: Adhesion of resin particles

Option B: Bonding between filler crystals

Option C: Bonding between filler and resin

Option D: Bonding between tooth and resin

Correct Answer: Bonding between tooth and resin ✔

Option A: BIS GMA

Option B: Polymethyl methacrylate

Option C: Benzoin methyl ether

Option D: Silica filter

Correct Answer: BIS GMA ✔

Option A: porosity

Option B: Shrinkage

Option C: Tooth breakage

Option D: Water absorption

Correct Answer: Shrinkage ✔

Option A: Silica glass

Option B: Organic matrix

Option C: Barium glass and strontium glasses

Option D: Fluoride particles

Correct Answer: Barium glass and strontium glasses ✔

Option A: Melts at 100°C

Option B: Softens at 100°C

Option C: Still requires heat for polymerization

Option D: Produces heat during polymerization

Correct Answer: Produces heat during polymerization ✔

Option A: Thermal polymerization of acrylic

Option B: Chemical polymerization

Option C: Retarding the polymerization reaction

Option D: To inhibit the action of benzoyl peroxide

Correct Answer: Chemical polymerization ✔

1. Hard thick central area
2. Thin Palatal area
3. Thin area of flanges
4. Porosity is uniformly distributed

Correct Answer: 1. Hard thick central area ✔

Option A: The former have a lower molecular weight

Option B: The former have higher residual monomer content

Option C: The former are more porous

Option D: The former have greater transverse strength

Correct Answer: The former have greater transverse strength ✔

Option A: Young’s modulus

Option B: Plastic strain

Option C: Elastic strain

Option D: Flexural strain

Correct Answer: Elastic strain ✔

Option A: Slicate cement

Option B: Composite

Option C: GIC

Option D: Polycarboxylate

Correct Answer: GIC ✔

Option A: Primary forces

Option B: Secondary forces

Option C: Cohesive forces

Option D: Ionic forces

Correct Answer: Cohesive forces ✔

Option A: Reflector

Option B: Translucent

Option C: Transparent

Option D: Opaque

Correct Answer: Transparent ✔

Option A: Complete wetting of surfaces

Option B: Rough surfaces between Adhesive & Adherent

Option C: Adherent and Adhesive molecules are tangent to each other

Option D: Irregularities present between Adherent surfaces

Correct Answer: Complete wetting of surfaces ✔

Option A: Ductile materials

Option B: Flexible materials

Option C: Brittle materials

Option D: Malleable materials

Correct Answer: Brittle materials ✔

Option A: Liquid should wet solid surface

Option B: Mechanical interlocking should be present

Option C: Should have high contact angle

Option D: None of the above

Correct Answer: Liquid should wet solid surface ✔

Option A: Solid solution

Option B: Eutectic mixture

Option C: Peritectic mixture

Option D: Inter metallic compounds

Correct Answer: Solid solution ✔

Option A: Grain

Option B: Nucleus

Option C: Stroma

Option D: None of the above

Correct Answer: Grain ✔

Option A: Define and measure colour qualitatively

Option B: Define and measure physical properties of gold alloys

Option C: Evaluate brittleness of different alloys

Option D: Measures different colours quantitatively

Correct Answer: Measures different colours quantitatively ✔

Option A: Inter atomic movement

Option B: Inter atomic imbalance

Option C: Arrangement of atoms

Option D: Arrangement of molecules

Correct Answer: Arrangement of atoms ✔

Option A: Resilience

Option B: Maximum flexibility

Option C: Toughness

Option D: Elastic limit

Correct Answer: Maximum flexibility ✔

Option A: Thixotropic

Option B: Pseudoplastic

Option C: Dilatant

Option D: Newton

Correct Answer: Dilatant ✔

Option A: Greater ductility

Option B: Greater toughness

Option C: A higher modulus of elasticity

Option D: A higher modulus of elasticity

Correct Answer: More resistance to permanent deformation ✔