dental materials MCQs – Page 18

Practise focused dental materials questions with marked answers for exam preparation and subject revision.

dental materials Mcqs
341. Nickel is added to wrought gold alloys as______________?
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A. Strengtherner

B. Whitens the alloy

C. Scavenger

D. Hardener

342. Die is________________?
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A. Replica of single tooth

B. Impression of whole teeth

C. Replica of whole teeth

D. Impression of single tooth

343. Agar is prepared from_______________________?
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A. Chick cells

B. Chemicals

C. Bullock heart

D. Sea weed
344. During soldering, the solidus temperature of the filler material should be_____________?
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A. Equal to the substrate material

B. Temperature not relevant

C. Lesser than the substrate material

D. Greater than the substrate material

345. Alginate impression material is similar to Agar-agar impression material in the following respect________________?
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A. Gelation increase in both on increase in temperature

B. Mixing time is increased to reduce the setting time

C. Deformation during removal of impression occurs due to distortion of gel fibers

D. Both can be re-used for fresh impressions

346. Quartz is added to gypsum bonded investment to______________?
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A. Increase the shelf life of investment

B. aid in hygroscopic expansion

C. Increase the strength

D. Counter balance contraction of gypsum during heating
347. The cross linking agent of polysulphide rubber base impression material is______________?
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A. Platinum salt catalyst

B. Lead dioxide

C. Stannous octate

D. Aromatic sulfonate esters

348. Beta hemihydrate particles absorb______________?
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A. no water

B. Less water

C. None of the above

D. More water
349. Hardening solutions are used with impression made of________________?
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A. Impression compound

B. Elastomer

C. Hydrocolloid

D. Zinc oxide eugenol

350. Rinsing of the impression is important to________________?
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A. Remove saliva

B. Remove excess impression material

C. Accelerate the setting

D. Hydrate the impression

351. Asbestos liner is used in a casting ring to________________?
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A. Permit expansion of the world

B. Retard the heating of the investment

C. All of the above

D. Facilitate venting of the mold

352. Syneresis is associated with______________?
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A. Zinc oxide eugenol

B. Plaster of paris

C. Hydrocolloids

D. Elastomers

353. Which is gypsum product_______________?
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A. All of the above

B. Investment

C. Plaster

D. Stone

354. The term given to the phenomenon of moisture absorption by an alginate impression in________________?
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A. Syneresis

B. Gelation

C. Imbibition

D. Hysteresis

355. Type I gypsum product is also called_______________?
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A. Class I stone / Hydrocal

B. Class II stone/Densite

C. Impression plaster

D. Model plaster

356. Annealing is also known as_______________?
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A. Soft hardening treatment

B. Hard hardening treatment

C. Precipitating heat treatment

D. Stress relieving heat treatment
357. Palladium is added to polyvinyl siloxane to_____________?
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A. Acts as plasticizer

B. Helps as surfactant

C. Act as a scavenger

D. Acts as a catalyst

358. Which of the following is not true about elastomeric impression ?
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A. Putty wash technique of impression reduces dimensional change of setting

B. Shear thinning is related to viscosity of non phase impression material

C. Single mix material have higher viscosity

D. Improper mixing of material can cause permanent deformation of impression

359. Gypsum bonded investment should not be heated over______________?
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A. 700C

B. 900C

C. 1,063C

D. 1,300C

360. Putty wash technique_________________?
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A. None of the above

B. Light body and putty used at the same time

C. Light body first and putty later

D. Putty used first and light body used second