Dental Materials MCQs

Option A: GIC

Option B: ZOE

Option C: Ca (OH)2

Option D: Zinc polycarboxylate cement

Correct Answer: ZOE ✔

Option A: High strength

Option B: Good marginal integrity

Option C: It can bond enamel & dentin

Option D: It has less occlusal wear

Correct Answer: It can bond enamel & dentin ✔

Option A: Adding a drop of water

Option B: Increasing mixing time

Option C: Cooling the slab

Option D: Adding a drop of oleic acid

Correct Answer: Adding a drop of water ✔

Option A: Glass Ionomer Cement

Option B: Zinc Phosphate

Option C: Resin cement

Option D: Silicate cement

Correct Answer: Silicate cement ✔

Option A: Zinc phosphate

Option B: Zinc oxide eugenol

Option C: Calcium hydroxide

Option D: Glass ionomer

Correct Answer: Glass ionomer ✔

Option A: Compression

Option B: Tensile force

Option C: Shear

Option D: Transverse bending force

Correct Answer: Shear ✔

Option A: Acetic acid

Option B: Zinc acetate dehydrate

Option C: Calcium chloride

Option D: Bromoglycerine

Correct Answer: Bromoglycerine ✔

Option A: Hydrated Aluminium phosphate

Option B: Hydrated Aluminium Phosphate with calcium fluoride

Option C: Hydrate Aluminosilicate gel

Option D: Hydrated Aluminium phosphate crystal, CAF2 alluminosiliate gel

Correct Answer: Hydrated Aluminium phosphate ✔

Option A: Heating up to 200 – 450°C for 15 – 30 min and quenching in water

Option B: Heating at 700°C for 10 – 15 min and quenching in water

Option C: Heating at 700°C for 1 hour and quenching in water

Option D: Heating above 700°C for 30 min and quenching in water

Correct Answer: A. Heating up to 200 – 450°C for 15 – 30 min and quenching in water ✔

Option A: Zinc phosphate cement

Option B: Glass Ionomer cement

Option C: Zinc oxide Eugenol cement

Option D: Resin cement

Correct Answer: Zinc phosphate cement ✔

Option A: ZnCl2 + Eugenol

Option B: ZnCl2 + ZnSO2

Option C: Eugenol + ZnO

Option D: Zn(OH)2 + ZnO

Correct Answer: ZnCl2 + ZnSO2 ✔

Option A: Temp of glass slab

Option B: P:L ratio

Option C: Consistency of mix

Option D: Alteration of mixing time

Correct Answer: P:L ratio ✔

Option A: Cementing crowns

Option B: Temporary dressing

Option C: base

Option D: cementing orthodontic bands

Correct Answer: Cementing crowns ✔

Option A: ZnO is converted to Zn(OH)2

Option B: Reaction is autocatalytic

Option C: Water is the byproduct of reaction

Option D: Dehydrated ZnO reacts with dehydrated eugenol

Correct Answer: Dehydrated ZnO reacts with dehydrated eugenol ✔

Option A: Reinforced auto care glass ionomer cement

Option B: Compomer

Option C: Resin modified glass ionomer cement

Option D: Ceramic reinforced glass ionomer cement

Correct Answer: Resin modified glass ionomer cement ✔

Option A: Equal lengths of base paste and accelerator paste are mixed together until the mix has a uniform colour

Option B: Increase in temperature and humidity shorten the setting time

Option C: The mix appear thick at the start of mixing but after 30 seconds of additional spatulation it becomes more fluid

Option D: Water accelerates but heat retards the setting of zinc oxide eugenol cements

Correct Answer: Both C & D ✔

Option A: High compressive strength

Option B: Tensile strength

Option C: High modulus of elasticity

Option D: Diametral strength

Correct Answer: High modulus of elasticity ✔

Option A: Average bonding to tooth

Option B: Low bonding to tooth

Option C: Excellent bonding to tooth

Option D: No bonding to tooth

Correct Answer: No bonding to tooth ✔

Option A: Zinc Phosphate cement

Option B: Zinc oxide equgenol cement

Option C: Zinc silicophosphate cement

Option D: Zinc polycarboxylate cement

Correct Answer: Zinc oxide equgenol cement ✔

Option A: Microfilled composite resins

Option B: Pure gold

Option C: Silver amalgam

Option D: Type II Glass ionomer cement

Correct Answer: Type II Glass ionomer cement ✔

Option A: Cement tooth interface

Option B: Cement prosthesis interface

Option C: Cleavage through the cement layer

Option D: Fracture of tooth or prosthesis

Correct Answer: Cement prosthesis interface ✔

Option A: mixing more powder to the liquid

Option B: mixing powder to liquid, checked by water

Option C: slower addition of powder to liquid

Option D: faster addition of powder to liquid

Correct Answer: slower addition of powder to liquid ✔

Option A: Carboxyl group

Option B: Chelates with Metal Ions

Option C: C=C double bond

Option D: Polymer chains

Correct Answer: Carboxyl group ✔

Option A: Phosphoric Acid

Option B: Ethyl alcohol

Option C: Benzoic acid

Option D: None of the above

Correct Answer: Benzoic acid ✔

Option A: Zinc oxide eugenol

Option B: Polycarboxylate cement

Option C: Zinc phosphate cement

Option D: Silicate cement

Correct Answer: Zinc oxide eugenol ✔

Option A: Zinc polycarboxylate

Option B: Polymer reinforced ZOE cement

Option C: Zinc phosphate

Option D: Glass inomer cement

Correct Answer: Zinc phosphate ✔

Option A: Decreasing conduction of heat to pulp

Option B: Minimize marginal leakage around restoration

Option C: By altering the chemical composition of restoration materials

Option D: By preventing penetration of corrosion products into the dentinal tubules

Correct Answer: Minimize marginal leakage around restoration ✔

Option A: 2 years

Option B: 4 years

Option C: 6 years

Option D: 8 years

Correct Answer: 4 years ✔

Option A: It is not necessary in moderately deep cavities under glass ionomer restoration

Option B: Have Film thickness of 1 – 50 microns

Option C: Do not provide thermal or electric insulation

Option D: Protect the pulp from reaction products leaching out of restoration

Correct Answer: B. Have Film thickness of 1 – 50 microns ✔

Option A: Polycarboxylate cement

Option B: Resin cement

Option C: Silicate cement

Option D: Glass ionomer cement

Correct Answer: Glass ionomer cement ✔

Option A: It is pulpal irritant

Option B: It is highly cariogenic

Option C: Chemically attaches to the tooth structure

Option D: It produces thinnest film surface

Correct Answer: It is pulpal irritant ✔

Option A: ZOE

Option B: Calcium Hydroxide

Option C: Zinc silicophosphate

Option D: Zinc phosphate

Correct Answer: Zinc silicophosphate ✔

Option A: In final cementation

Option B: As temporary cementation

Option C: As a temporary filling material

Option D: It has less occlusal wear

Correct Answer: In final cementation ✔

Option A: Silicate

Option B: ASPA

Option C: Polycarboxylate

Option D: Zinc phosphate

Correct Answer: Silicate ✔

Option A: 60%

Option B: 70%

Option C: 80%

Option D: 90%

Correct Answer: 70% ✔

Option A: Zinc phosphate and GIC

Option B: Silicate and GIC

Option C: ZOE and Silicate

Option D: Zinc phosphate and SIlicate

Correct Answer: Zinc phosphate and SIlicate ✔

Option A: Rosin

Option B: Zinc oxide

Option C: Zinc acetate

Option D: Oil of cloves

Correct Answer: Zinc oxide ✔

Option A: Carboxylate cement

Option B: Zinc oxide-eugenol cement

Option C: Zinc phosphate

Option D: Ethoxybenzoic acid

Correct Answer: Zinc phosphate ✔

Option A: Glass ionomer

Option B: Resin cement

Option C: Polycarboxylate cement

Option D: Silico-Phosphate cement

Correct Answer: Resin cement ✔

Option A: Mouth breathers

Option B: Patients with high caries index

Option C: In the restoration of posterior tooth

Option D: None of the above

Correct Answer: Patients with high caries index ✔

Option A: Glass ionomer

Option B: Polycarboxylate

Option C: Silicate

Option D: Resin cement

Correct Answer: Polycarboxylate ✔

Option A: 1 Minutes

Option B: 2 Minutes

Option C: 3 Minutes

Option D: 4 Minutes

Correct Answer: 3 Minutes ✔

Option A: Acetic acid

Option B: Zinc acetate dehydrate

Option C: Calcium chloride

Option D: Bromoglycerine

Correct Answer: Bromoglycerine ✔

Option A: GIC and polycarboxylate

Option B: GIC and ZnPO4

Option C: ZnPO4 and silicate

Option D: GIC and silicate

Correct Answer: GIC and polycarboxylate ✔

Option A: The reduction in enamel solubility due to fluoride uptake by enamel

Option B: That beryllium flux is used in silicates

Option C: That silicates show very little leakage at the margins of the restoration

Option D: Due to the high silica content

Correct Answer: The reduction in enamel solubility due to fluoride uptake by enamel ✔

Option A: Amalgam

Option B: Silicate

Option C: Composite resin

Option D: Cavity varnish

Correct Answer: Silicate ✔

Option A: Acetic acid

Option B: Alginic acid

Option C: Phosphoric acid

Option D: Ortho-ethoxy acid

Correct Answer: Ortho-ethoxy acid ✔

Option A: Zinc oxide eugenol

Option B: Zinc polycarboxylate

Option C: SIlicate

Option D: Glass ionomer

Correct Answer: Both B & D ✔

Option A: Polysiloxane

Option B: Phosphoric acid

Option C: Polyacrylic acid

Option D: Ion leachable glass

Correct Answer: Polyacrylic acid ✔

Option A: Composites

Option B: Direct filling resins

Option C: Polycarboxylate cements

Option D: BIS-GMA resins in pit and fissure sealants

Correct Answer: Polycarboxylate cements ✔

Option A: Decreased strength

Option B: Decreased film thickness

Option C: Decreased solubility

Option D: Increased setting time

Correct Answer: Decreased solubility ✔

Option A: 55 – 65

Option B: 65 – 75

Option C: 75 – 85

Option D: 85 – 95

Correct Answer: B. 65 – 75 ✔

Option A: Eugenol

Option B: Calcium Hydroxide

Option C: Zinc oxide

Option D: Silica

Correct Answer: Calcium Hydroxide ✔

Option A: Silicate cement

Option B: Glass ionomer cement

Option C: Polycarboxylate cement

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Continuing alloying between silver-tin alloy and mercury during the life of restoration

Option B: Deformation of set amalgam during function

Option C: Process whereby alloy is wetted by murcury

Option D: Spread of amalgam during packing

Correct Answer: Deformation of set amalgam during function ✔

Option A: Compressive stress

Option B: Impact stress

Option C: Shear stress

Option D: Tensile stress

Correct Answer: Compressive stress ✔

Option A: 80 Mpa

Option B: 140 Mpa

Option C: 260 Mpa

Option D: 510 Mpa

Correct Answer: 80 Mpa ✔

Option A: 9-20% copper

Option B: 13-20% copper

Option C: 9-30% copper

Option D: 13-30% copper

Correct Answer: 9-20% copper ✔

Option A: Increase in tarnish and corrosion resistance

Option B: Increase the marginal strength

Option C: Decrease the tarnish and corrosion resistance

Option D: Increased compressive strength

Correct Answer: Increase in tarnish and corrosion resistance ✔

Option A: Using spherical particles

Option B: Lathe cut alloy

Option C: Altering Hg-Alloy ratio

Option D: Trituration time

Correct Answer: Trituration time ✔

Option A: Less than 0.02%

Option B: Less than 0.1%

Option C: Less than 0.01%

Option D: None of the above

Correct Answer: Less than 0.01% ✔

Option A: Have less marginal breakdown

Option B: Are workable at lower Hg-alloy ratio

Option C: Have a higher ratio of tensile to compressive strength

Option D: Have less resistance to tarnish and corrosion

Correct Answer: Have less marginal breakdown ✔

Option A: Silver

Option B: Tin

Option C: Zinc

Option D: Copper

Correct Answer: Silver ✔

Option A: Dissolve the alloy in mercury

Option B: Coat the alloy particle with mercury

Option C: Remove excess mercury from the amalgam

Option D: Dissolve Hg in alloy

Correct Answer: Coat the alloy particle with mercury ✔

Option A: 38-42%

Option B: 48-52%

Option C: 58-62%

Option D: 68-72%

Correct Answer: 48-52% ✔

Option A: 30-35%

Option B: 26-28%

Option C: 13-32%

Option D: 22-30%

Correct Answer: 26-28% ✔

Option A: Zinc and water

Option B: Water

Option C: Hydrogen

Option D: Nascent oxygen

Correct Answer: Hydrogen ✔

Option A: More compressive strength but less tensile strength

Option B: More compressive strength and tensile strength

Option C: Less compressive strength but more tensile strength

Option D: Less compressive strength and tensile strength

Correct Answer: More compressive strength and tensile strength ✔

Option A: Copper

Option B: Zinc

Option C: Silver

Option D: Tin

Correct Answer: Tin ✔

Option A: Higher the strength

Option B: Lower the creep value

Option C: More matrix matrial formed

Option D: More gamma 1 phase formed

Correct Answer: More matrix matrial formed ✔

Option A: The resultant alloy is greater

Option B: The resultant alloy is lesser

Option C: The resultant alloy varies according to the content of Ag of Cu

Option D: None of the above

Correct Answer: The resultant alloy is lesser ✔

Option A: 35 pounds

Option B: 3 pounds

Option C: 15 lb

Option D: 25 lb

Correct Answer: 3 pounds ✔

Option A: Low tensile and compressive strength

Option B: Low Hg: Alloy ratio

Option C: High tensile strength

Option D: Low creep

Correct Answer: Low tensile and compressive strength ✔

Option A: A metallic powder composed of silver, tin, copper and zinc

Option B: An alloy of two or more metals one of which is mercury

Option C: An alloy of two or more metals that have been dissolved in each other in the molten state

Option D: A metallic substances in powder or tablet from that is mixed with mercury

Correct Answer: An alloy of two or more metals one of which is mercury ✔

Option A: Cu

Option B: Zn

Option C: Pd

Option D: Ag

Correct Answer: Zn ✔

Option A: Ag

Option B: Zn

Option C: Cu

Option D: Hg

Correct Answer: Cu ✔

Option A: Requires least amount of mercury

Option B: Achieves high compressive strength at 1 hr.

Option C: Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys

Option D: Has lower cree value

Correct Answer: Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys ✔

Option A: Low copper amalgam alloy

Option B: Admix alloy

Option C: Single composition alloys

Option D: Creep value of all the above mentioned alloys is same

Correct Answer: Low copper amalgam alloy ✔

Option A: hours

Option B: 4 hours

Option C: 8 hours

Option D: 16 hours

Correct Answer: hours ✔

Option A: hours

Option B: 4 hours

Option C: 8 hours

Option D: 16 hours

Correct Answer: hours ✔

Option A: Complexes with hemoglobinto form methemoglobin

Option B: Inhibits hemoglobin synthesis, producing anemia

Option C: Inhibits anaerobic glycolysis

Option D: Binds to sulfhydryl groups

Correct Answer: Binds to sulfhydryl groups ✔

Option A: 45-55%

Option B: 55-65%

Option C: 65-85%

Option D: More than 85%

Correct Answer: 65-85% ✔

Option A: Amalgam alloy

Option B: Trituration time

Option C: Speed of amalgamator

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Under trituration or over trituration of amalgam

Option B: Decreases with condensation pressure

Option C: Increase with condensation pressure

Option D: Cannot be predictable

Correct Answer: Increase with condensation pressure ✔

Option A: It increases compresssive and tensile strengths

Option B: Decreased compressive, increased strength

Option C: Decreased compressive, decrease tensile strength

Option D: Increased compressive, increased tensile strength

Correct Answer: It increases compresssive and tensile strengths ✔

Option A: Low compressive strength

Option B: High marginal breakdown

Option C: Less marginal #

Option D: High creep

Correct Answer: Less marginal # ✔

Option A: 6.6 a (ppm k-1)

Option B: 11.4 a (ppm k-1)

Option C: 14.0 a (ppm k-1)

Option D: 25.0 a (ppm k-1)

Correct Answer: 25.0 a (ppm k-1) ✔

Option A: Improper amalgam filling

Option B: Pulp exposure

Option C: Galvanism

Option D: None of the above

Correct Answer: Galvanism ✔

Option A: Compressive strength

Option B: Tensile strength

Option C: Corrosion

Option D: Creep

Correct Answer: Compressive strength ✔

Option A: Lungs

Option B: Gastro-intestinal Track

Option C: Skin

Option D: Kidneys

Correct Answer: Kidneys ✔

Option A: From smooth atomized particles

Option B: From irregular and spherical particles

Option C: From lathe cut particles

Option D: From traditional alloy particles

Correct Answer: From irregular and spherical particles ✔

Option A: Remove oxides from powder particle surface

Option B: Keep the amount of gamma-1 or gamma-2 matrix crystals to maximum

Option C: Pulverize pelletes into particles to aid in attack by mercury

Option D: Achieve a workable mass of amalgam in minimum time

Correct Answer: Keep the amount of gamma-1 or gamma-2 matrix crystals to maximum ✔

Option A: Silver

Option B: Tin

Option C: Mercury

Option D: Zinc

Correct Answer: Mercury ✔

Option A: Requires least amount of mercury

Option B: Achieves lowest compressive strength at 1 hr.

Option C: Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloy

Option D: Has low creep

Correct Answer: Achieves lowest compressive strength at 1 hr. ✔

Option A: Dry Mix

Option B: Shiny Mix

Option C: Short Mixing Time

Option D: None of the above

Correct Answer: Shiny Mix ✔

Option A: 40 Gpa and 60 – 100 Mpa

Option B: 21 Gpa and 27 – 55 Mpa

Option C: 350 Gpa and 10 – 120 Mpa

Option D: 360 Gpa and 125 – 130 Mpa

Correct Answer: B. 21 Gpa and 27 – 55 Mpa ✔

Option A: Electrochemical Corrosion

Option B: Chemical Corrosion

Option C: Penetrating Corrosion

Option D: Corrosion does not occur at all

Correct Answer: Penetrating Corrosion ✔

Option A: Maximum matrix and minimum alloy phase

Option B: Minimum matrix and maximum alloy phase

Option C: Maximum matrix phase

Option D: Minimum alloy phase

Correct Answer: Minimum matrix and maximum alloy phase ✔

Option A: 5 minutes

Option B: 6 minutes

Option C: 3 minutes

Option D: 15 minutes

Correct Answer: 3 minutes ✔

Option A: y1

Option B: y2

Option C: B1

Option D: y

Correct Answer: y1 ✔