dental materials Mcqs
401. The advantage of ZOE impression paste_______________?
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A. Is easy manipulation

B. Has dimensional stability

C. Does not require special trays

D. Does not adhere to tissues

402. Alginate impression material is________________?
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A. Non-elastic impression material

B. More mucostatic than ZOE

C. Less mucostatic than ZOE

D. Thermoplastic impression material

404. Waxes are used for_______________?
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A. Corrective impressions

B. Primary impression

C. Impression of single tooth

D. None of the above

405. The function of 2% potassium sulphate in a gypsum product is_____________?
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A. Regulate setting time

B. To regulate the setting expansion

C. None

D. Acts as retarder

406. The main ingredient of inlay wax is__________________?
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A. Carnauba wax

B. Candellila wax

C. Paraffin wax

D. Gum dammar

407. The impression with the least dimensional change upon disinfection is_______________?
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A. Polysulphide

B. Agar-agar

C. Addition poly silicone

D. Polyether

409. Nickel-Titanium alloy has__________________?
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A. Unreliable spring back

B. Minimal spring back

C. None of the above

D. low spring back

410. Syneresis seen in hydrocolloid gel is______________?
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A. Shrinkage

B. Gelation

C. Water absorption

D. Seen as water loss
411. The effects associated with cold working can be eliminated by a heat treatment called______________?
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A. Homogenization heat treatment

B. Annealing heat treatment

C. Age hardening heat treatment

D. Solution heat treatment

412. Most mucostatic among the following_____________?
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A. Impression compound

B. ZOE paste

C. Elastomer

D. Alginate

413. Syringe material is______________?
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A. Medium viscosity elastomer

B. Medium & low viscosity elastomer

C. High viscosity elastomer

D. Low viscosity elastomer
415. Mouth temperature waxes are_______________?
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A. None of the above

B. Green stick wax

C. Iowa wax

D. Modeling wax

417. All of the following statements about cast cobalt alloy are true EXCEPT_____________?
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A. They are more rigid than gold alloys

B. They have a lower proportional limit than gold alloys

C. They have a modulus of elasticity twice that of gold alloys

D. They have higher ductility than gold alloys
418. Cause of expansion in zinc containing amalgam is_____________?
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A. Zinc and water

B. Hydrogen

C. Nascent oxygen

D. Water

419. Porosity in porcelain at condensation stage depends on_________________?
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A. None of the above

B. Shape and size of particle

C. Uniform distribution of particle size

D. Number of particles

421. Decrease in creep occurs in_______________?
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A. Under trituration or over trituration of amalgam

B. Decreases with condensation pressure

C. Increase with condensation pressure

D. Cannot be predictable

422. The preferred material for repair of fractured denture base is______________?
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A. Heat curve resin

B. Chemically cure resin

C. Vinyl resin

D. Light cure resin

423. The principle application of zinc phosphate cement is_____________?
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A. As a temporary filling material

B. It has less occlusal wear

C. In final cementation

D. As temporary cementation

424. Which glass ionomer cement develops early resistance to water intake on setting ?
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A. Resin modified glass ionomer cement

B. Reinforced auto care glass ionomer cement

C. Ceramic reinforced glass ionomer cement

D. Compomer

425. Flux used in dental ceramic is________________?
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A. Kaolin

B. Boric oxide

C. Silica

D. Alumina

426. Electralloy is an alloy of________________?
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A. Cobalt and Chromium

B. Gold and Calcium

C. Tin and chromium

D. Gold and Platinum

427. Cohesion of gold foil is an example of______________?
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A. Wedging

B. Atomic attraction and welding

C. Adaptation

D. Annealing

430. Amalgam means_____________?
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A. A metallic powder composed of silver, tin, copper and zinc

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

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

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

431. Which of the following does not occur in High Copper Amalgam ?
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A. Electrochemical Corrosion

B. Chemical Corrosion

C. Corrosion does not occur at all

D. Penetrating Corrosion
432. Which of the following cements is most kind to pulp ?
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A. Glass ionomer

B. Resin cement

C. Polycarboxylate

D. Silicate

434. The effect of zinc oxide-eugenol on the pulp ?
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A. Is irritating

B. Has no effect

C. Is sedating

D. Encourages pulpal fibrosis

436. The tarnished layer of silver amalgam consists of________________?
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A. Chlorides of tin

B. All of the above

C. Oxides of tin

D. Sulphides of silver
437. Powdered gold is___________________?
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A. Made by milling pure gold ingots

B. Made by electrolytic precipitation

C. Made by beating pure gold at high temperatures

D. Made by a combination of chemical precipitation and atomization
439. Thickness of luting cement is_____________?
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A. 60-80?

B. 10-20?

C. 20-40?

D. 1-2?

440. Admixed high copper alloy powder contains_________________?
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A. 9-30% copper

B. 13-20% copper

C. 13-30% copper

D. 9-20% copper
441. To prevent porosity in dental porcelain it should be backed________________?
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A. Under pressure

B. Boric oxide

C. In vacuum

D. For long period

442. Green strength with reference to plaster means_____________?
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A. The wet strength

B. Compressive strength

C. Strength of dental stone due to green colour

D. Dry strength

443. Quartz is Dental porcelain is______________?
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A. Crack minimzer

B. Strengthener

C. Binder

D. Pigment

444. All of the following statements are true for zinc oxide eugenol cements except______________?
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A. Equal lengths of base paste and accelerator paste are mixed together until the mix has a uniform colour

B. Increase in temperature and humidity shorten the setting time

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

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

E. Both C & D
445. Which is not true about high copper amalgam alloys______________?
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A. Low creep

B. Low tensile and compressive strength

C. High tensile strength

D. Low Hg: Alloy ratio

446. Which of the following do polycarboxylate and GIC have in common ?
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A. Polyacrylic acid

B. Polysiloxane

C. Phosphoric acid

D. Ion leachable glass

447. The most toxic form of mercury is_________________?
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A. Methyl and ethyl mercury

B. Inorganic mercury forms

C. Mercury vapour

D. Mercury sulphide

449. Opaque porcelain________________?
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A. Not used to mask the colour of the cement used in placing of restoration

B. Is Feldspathic glass

C. Used to produce the characteristic translucence, which is an inherent aspect of the incisal edge in natural teeth

D. Contains opacifier like zirconium and titanium oxide
450. Most preferable cement for temporary restoration______________?
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A. ZOE

B. Ca (OH)2

C. Zinc polycarboxylate cement

D. GIC