Dental Materials Mcqs - Set 14

1)   Ethoxy benzoic acid increases the strength and solubility of the cement______________?

a. Zinc oxide eugenol
b. Polycarboxylate cement
c. Zinc phosphate cement
d. Silicate cement
Answer  Explanation 

ANSWER: Zinc oxide eugenol

Explanation:
No explanation is available for this question!


2)   Which cement base has the highest modulus of elasticity ?

a. Zinc polycarboxylate
b. Polymer reinforced ZOE cement
c. Zinc phosphate
d. Glass inomer cement
Answer  Explanation 

ANSWER: Zinc phosphate

Explanation:
No explanation is available for this question!


3)   The cavity varnish applied reduces post operative sensitivity in amalgam restoration by____________?

a. Decreasing conduction of heat to pulp
b. Minimize marginal leakage around restoration
c. By altering the chemical composition of restoration materials
d. By preventing penetration of corrosion products into the dentinal tubules
Answer  Explanation 

ANSWER: Minimize marginal leakage around restoration

Explanation:
No explanation is available for this question!


4)   The average life of silicate cement restoration is______________?

a. 2 years
b. 4 years
c. 6 years
d. 8 years
Answer  Explanation 

ANSWER: 4 years

Explanation:
No explanation is available for this question!


5)   All of the following are true for traditional solution liner, except_________________?

a. It is not necessary in moderately deep cavities under glass ionomer restoration
b. Have Film thickness of 1 – 50 microns
c. Do not provide thermal or electric insulation
d. Protect the pulp from reaction products leaching out of restoration
Answer  Explanation 

ANSWER: Have Film thickness of 1 – 50 microns

Explanation:
No explanation is available for this question!


6)   Which of the following cements bonds to tooth structure, which has an anticariogenic effect, has a degree of translucency and does not irritate the pulp ?

a. Polycarboxylate cement
b. Resin cement
c. Silicate cement
d. Glass ionomer cement
Answer  Explanation 

ANSWER: Glass ionomer cement

Explanation:
No explanation is available for this question!


7)   Which of the following characterizes the silicate cement______________?

a. It is pulpal irritant
b. It is highly cariogenic
c. Chemically attaches to the tooth structure
d. It produces thinnest film surface
Answer  Explanation 

ANSWER: It is pulpal irritant

Explanation:
No explanation is available for this question!


8)   Which of the following cements have anti cariogenic properly________________?

a. ZOE
b. Calcium Hydroxide
c. Zinc silicophosphate
d. Zinc phosphate
Answer  Explanation 

ANSWER: Zinc silicophosphate

Explanation:
No explanation is available for this question!


9)   The principle application of zinc phosphate cement is_____________?

a. In final cementation
b. As temporary cementation
c. As a temporary filling material
d. It has less occlusal wear
Answer  Explanation 

ANSWER: In final cementation

Explanation:
No explanation is available for this question!


10)   Which of the following cements is contraindicated in mouth breathers_______________?

a. Silicate
b. ASPA
c. Polycarboxylate
d. Zinc phosphate
Answer  Explanation 

ANSWER: Silicate

Explanation:
No explanation is available for this question!


11)   Percentage of zinc in ZOE cement is__________________?

a. 60%
b. 70%
c. 80%
d. 90%
Answer  Explanation 

ANSWER: 70%

Explanation:
No explanation is available for this question!


12)   The main components is sillicophosphate cement________________?

a. Zinc phosphate and GIC
b. Silicate and GIC
c. ZOE and Silicate
d. Zinc phosphate and SIlicate
Answer  Explanation 

ANSWER: Zinc phosphate and SIlicate

Explanation:
No explanation is available for this question!


13)   Which component of zinc oxide-eugenol cement gives its strength ?

a. Rosin
b. Zinc oxide
c. Zinc acetate
d. Oil of cloves
Answer  Explanation 

ANSWER: Zinc oxide

Explanation:
No explanation is available for this question!


14)   Which cement is irritating to the pulp ?

a. Carboxylate cement
b. Zinc oxide-eugenol cement
c. Zinc phosphate
d. Ethoxybenzoic acid
Answer  Explanation 

ANSWER: Zinc phosphate

Explanation:
No explanation is available for this question!


15)   The cement Which is least soluble in oral cavity______________?

a. Glass ionomer
b. Resin cement
c. Polycarboxylate cement
d. Silico-Phosphate cement
Answer  Explanation 

ANSWER: Resin cement

Explanation:
No explanation is available for this question!


16)   Silicate cement is indicated in________________?

a. Mouth breathers
b. Patients with high caries index
c. In the restoration of posterior tooth
d. None of the above
Answer  Explanation 

ANSWER: Patients with high caries index

Explanation:
No explanation is available for this question!


17)   Which of the following cements is most kind to pulp ?

a. Glass ionomer
b. Polycarboxylate
c. Silicate
d. Resin cement
Answer  Explanation 

ANSWER: Polycarboxylate

Explanation:
No explanation is available for this question!


18)   What is the working time of zinc polyacrylate cement ?

a. 1 Minutes
b. 2 Minutes
c. 3 Minutes
d. 4 Minutes
Answer  Explanation 

ANSWER: 3 Minutes

Explanation:
No explanation is available for this question!


19)   All of the following is used as accelerator in zinc oxide eugenol cement except_____________?

a. Acetic acid
b. Zinc acetate dehydrate
c. Calcium chloride
d. Bromoglycerine
Answer  Explanation 

ANSWER: Bromoglycerine

Explanation:
No explanation is available for this question!


20)   The tow cements which hold with the tooth are_______________?

a. GIC and polycarboxylate
b. GIC and ZnPO4
c. ZnPO4 and silicate
d. GIC and silicate
Answer  Explanation 

ANSWER: GIC and polycarboxylate

Explanation:
No explanation is available for this question!


21)   The logical explanation for the unique anticariogenic property of most silicate cements is______________?

a. The reduction in enamel solubility due to fluoride uptake by enamel
b. That beryllium flux is used in silicates
c. That silicates show very little leakage at the margins of the restoration
d. Due to the high silica content
Answer  Explanation 

ANSWER: The reduction in enamel solubility due to fluoride uptake by enamel

Explanation:
No explanation is available for this question!


22)   Thermal conductivity of which material is close to dentin____________?

a. Amalgam
b. Silicate
c. Composite resin
d. Cavity varnish
Answer  Explanation 

ANSWER: Silicate

Explanation:
No explanation is available for this question!


23)   Eugenol may be replaced in the zinc oxide eugenol cement by______________?

a. Acetic acid
b. Alginic acid
c. Phosphoric acid
d. Ortho-ethoxy acid
Answer  Explanation 

ANSWER: Ortho-ethoxy acid

Explanation:
No explanation is available for this question!


24)   Which is the cement with adhesive properties ?

a. Zinc oxide eugenol
b. Zinc polycarboxylate
c. SIlicate
d. Glass ionomer
e. Both B & D
Answer  Explanation 

ANSWER: Both B & D

Explanation:
No explanation is available for this question!


25)   Which of the following do polycarboxylate and GIC have in common ?

a. Polysiloxane
b. Phosphoric acid
c. Polyacrylic acid
d. Ion leachable glass
Answer  Explanation 

ANSWER: Polyacrylic acid

Explanation:
No explanation is available for this question!


26)   Which of the following show chemical bond with enamel (Calcified tissues)______________?

a. Composites
b. Direct filling resins
c. Polycarboxylate cements
d. BIS-GMA resins in pit and fissure sealants
Answer  Explanation 

ANSWER: Polycarboxylate cements

Explanation:
No explanation is available for this question!


27)   Increased amount of powder in zinc phosphate cement mixture will cause_______________?

a. Decreased strength
b. Decreased film thickness
c. Decreased solubility
d. Increased setting time
Answer  Explanation 

ANSWER: Decreased solubility

Explanation:
No explanation is available for this question!


28)   The temperature (in °F) of the mixing slab for silicate cements should be_____________?

a. 55 – 65
b. 65 – 75
c. 75 – 85
d. 85 – 95
Answer  Explanation 

ANSWER: 65 – 75

Explanation:
No explanation is available for this question!


29)   Which one of the following dental cement accelerates the formation of reparative dentin ?

a. Eugenol
b. Calcium Hydroxide
c. Zinc oxide
d. Silica
Answer  Explanation 

ANSWER: Calcium Hydroxide

Explanation:
No explanation is available for this question!


30)   Fluoride rich materials include ?

a. Silicate cement
b. Glass ionomer cement
c. Polycarboxylate cement
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


31)   Dynamic creep is the______________?

a. Continuing alloying between silver-tin alloy and mercury during the life of restoration
b. Deformation of set amalgam during function
c. Process whereby alloy is wetted by murcury
d. Spread of amalgam during packing
Answer  Explanation 

ANSWER: Deformation of set amalgam during function

Explanation:
No explanation is available for this question!


32)   The dental amalgam is most resistant to________________?

a. Compressive stress
b. Impact stress
c. Shear stress
d. Tensile stress
Answer  Explanation 

ANSWER: Compressive stress

Explanation:
No explanation is available for this question!


33)   According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?

a. 80 Mpa
b. 140 Mpa
c. 260 Mpa
d. 510 Mpa
Answer  Explanation 

ANSWER: 80 Mpa

Explanation:
No explanation is available for this question!


34)   Admixed high copper alloy powder contains_________________?

a. 9-20% copper
b. 13-20% copper
c. 9-30% copper
d. 13-30% copper
Answer  Explanation 

ANSWER: 9-20% copper

Explanation:
No explanation is available for this question!


35)   Finishing and polishing of Amalgam make the restoration______________?

a. Increase in tarnish and corrosion resistance
b. Increase the marginal strength
c. Decrease the tarnish and corrosion resistance
d. Increased compressive strength
Answer  Explanation 

ANSWER: Increase in tarnish and corrosion resistance

Explanation:
No explanation is available for this question!


36)   Setting time of Amalgam is best controlled by _______________?

a. Using spherical particles
b. Lathe cut alloy
c. Altering Hg-Alloy ratio
d. Trituration time
Answer  Explanation 

ANSWER: Trituration time

Explanation:
No explanation is available for this question!


37)   In non zinc containing dental amalgam alloy the percentage of zinc present is______________?

a. Less than 0.02%
b. Less than 0.1%
c. Less than 0.01%
d. None of the above
Answer  Explanation 

ANSWER: Less than 0.01%

Explanation:
No explanation is available for this question!


38)   High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?

a. Have less marginal breakdown
b. Are workable at lower Hg-alloy ratio
c. Have a higher ratio of tensile to compressive strength
d. Have less resistance to tarnish and corrosion
Answer  Explanation 

ANSWER: Have less marginal breakdown

Explanation:
No explanation is available for this question!


39)   The largest component of amalgam alloy is_____________?

a. Silver
b. Tin
c. Zinc
d. Copper
Answer  Explanation 

ANSWER: Silver

Explanation:
No explanation is available for this question!


40)   During amalgamation, trituration is done to_____________?

a. Dissolve the alloy in mercury
b. Coat the alloy particle with mercury
c. Remove excess mercury from the amalgam
d. Dissolve Hg in alloy
Answer  Explanation 

ANSWER: Coat the alloy particle with mercury

Explanation:
No explanation is available for this question!