dental materials MCQs – Page 12

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

dental materials Mcqs

221. Elastomers except: Polyether are_______________?
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A. Water loving impression materials

B. Hydrophilic

C. Hydrophobic

D. Potassium alginates

222. Quartz in investment material is added for_______________?
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A. Expansion components for casting shrinkage

B. Contraction

C. Strength

D. Decrease strength

223. Impression techniques are used for recording________________?
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A. Oral mucosal tissues

B. None of the above

C. Dental hard tissues

D. Oral mucosal tissues and dental hard tissues

224. Which is best material for RPD impression_______________?
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A. Irreversible hydrocolloid

B. Impression plaster

C. None of the above

D. Reversible hydroollioid

225. Most flexible impression material______________?
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A. Alginate

B. Addition silicone

C. Impression compound

D. Impression paste

226. Corrosion of stainless steel is due to formulation of_________________?
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A. Nickel carbide

B. Chromium carbide

C. Carbon carbide

D. Iron carbide

227. Which of the following is correct arrangement of impression material regarding linear contraction in ascending order ?
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A. Addition silicone < polyether < polysulfide < condensation silicone

B. condensation silicone < polysulfide < polyether < Addition silicone

C. condensation silicone < polyether < polysulfide < Addition silicone

D. Addition silicone < polysulfide < Polyether < condensation silicone

228. Powders of dental plaster and dental stone differ mainly in____________?
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A. Particle porosity

B. Solubility

C. Shelf life

D. Chemical formula

229. The process of changing the rubber base product or liquid polymer, to a rubber like material is generally known as_____________?
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A. Chain lengthening

B. Vulconization

C. Boiling

D. Condensation

230. All of the following statements about an alginate impression are EXCEPT________________?
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A. It should be rapidly displaced from the mouth

B. It will take up water and expand if kept wet

C. It will shrink as a result of syneresis

D. It may exhibit fluid exudates on the surface as a result of imbibition of water

231. Which one of the following increase the strength and reduce viscosity of agar hydrocolloid impression material_____________?
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A. Water

B. Sulfates

C. Borax

D. Carbonates

232. Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?
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A. Platinum

B. Silver

C. Gold

D. Copper

233. Which one of the following impression materials is elastic, sets by a chemical reaction and is catalyzed by chloroplatinic acid_______________?
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A. Condensation silicone

B. Polyether

C. Polysulfide

D. Poly vinyl siloxane

234. Inlay wax is used to_______________?
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A. Invest inlay patterns

B. Make inlay wax patterns

C. Box models

D. Temporarily cement inlays:

235. Microstructure of cobalt chromium alloy in cast condition is______________?
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A. Fibrous

B. Homogeneous

C. Inhomogenous

D. amorphous

236. To make the vinyl Polysiloxane hydrophilic the following is added_______________?
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A. Surfactant

B. Mineral oil

C. Plasticizer

D. Water

237. The most commonly used Titanium alloy for dental and medical purposes is________________?
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A. Ti 5Al 4V

B. Ti 6Al 6V

C. Ti 6Al 4V

D. Ti 5Al 5V

238. All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?
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A. Adding a small amount of water

B. Altering the amounts of the two pastes used

C. Adding a small amount of glycerine

D. Cooling mixing slab

239. Rubber base impressions are poured immediately as they_______________?
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A. Continue to polymerize

B. Show imbibition and syneresis

C. Become elastic

D. Show gelation

240. The sprue in wax pattern should be placed________________?
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A. At 45C angle

B. It depend upon type of wax pattern

C. At obtuse angle

D. At right angle

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