dental materials MCQs – Page 15

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

dental materials Mcqs

281. The role of magnesium chloride in zinc oxide eugenol impression paste_________________?
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A. Retarder

B. Accelerator

C. Modifier

D. Plasticier

282. Hypersensitivity reactions like contact dermatitis can be caused by______________?
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A. Polyether

B. Condensation silicones

C. polysulfides

D. addition silicones

283. Which of the following is function of fluoride flux in soldering process ?
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A. Increase the strength of solder

B. It prevents the formation of chromium oxide or dissolves chromic oxide layer

C. It prevents the formation of copper oxide

D. It prevents the flow of material in undesirable area

284. Which of the following is used as surface hardener in Impression material ?
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A. 2% Potassium sulfate

B. 2% sodium sulfate

C. 0.2% Potassium sulfate

D. 4% Potassium sulfate

285. Component of inlay wax which makes it flake resistant is_____________?
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A. Canadelila

B. Carnauba

C. Gum dammar

D. Paraffin

286. Polysulfide material is routinely not recommended because of_______________?
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A. Least permanent deformation

B. Unpleasant odor and taste

C. Low accuracy

D. Highest curing shrinkage

287. The basic constituent of reversible hydrocolloid impression material is________________?
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A. Gelatin

B. alginate

C. Alginic acid

D. Agar

288. The function of a sprue is to_______________?
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A. Help polish cast restorations

B. Reproduce fine detail

C. Form an opening of molten metal to enter the mold

D. Eliminate air bubbles on the wax pattern

289. Which of the following fuel gases is the best choice of heat source to carry out soldering process ?
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A. Hydrogen

B. Natural gas

C. Acetylene

D. Propane

290. Function of wetting agents used in casting procedure is_________________?
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A. To felicitate mixing investment

B. To felicitate wetting of ring liner

C. For better wax elimination

D. To reduce contact angle of liquid with max surface

291. What is the minimum thickness of the elastomeric impression material for an accurate impression_______________?
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A. 2 mm

B. Maximum in the area of operation

C. Greater than 3 mm

D. 2-4 mm

292. Two in one stage impression materials include______________?
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A. All of the above

B. Elastomeric impression material

C. Zinc Oxide eugenol impression paste

D. Hydrocolloid impression material

293. Type III Dental gypsum is__________________?
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A. Model or lab plaster

B. Class I stone or hydrocal

C. Densite

D. Class II stone

294. The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?
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A. 5 to 10%

B. <1%

C. 2 to 3%

D. 0%

295. Best impression material to be used for securing impression after crown preparation_______________?
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A. Agar

B. Elastome

C. Alginate

D. Zno paste

296. Stainless steel is used mostly in dentistry_________________?
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A. To strength amalgam

B. To replace internal gold restorations

C. To construct clasps for partial dentures

D. In orthodontic wires

297. Which of the following decrease with strain hardening______________?
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A. Surface hardness

B. Proportion limit

C. Strength

D. Corrosion resistance

298. Which one of the following categories of dental materials has the highest thermal conductivity_________________?
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A. Gold alloys

B. Zinc phosphate cements

C. Porcelains

D. Unfilled acrylic plastics

299. Before pouring an elastic impression it is washed with slurry of water and stone to______________?
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A. Prevent distortion

B. Prevent syneresis

C. Wash off saliva on impression

D. Increase gel strength

300. Type I and Type II zinc oxide impression paste differ with respect to_______________?
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A. Eugenol content

B. Their hardness after setting

C. Their use

D. Water content

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