dental materials MCQs – Page 16

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

dental materials Mcqs
301. Trisodium phosphate added to alginate contributes towards_______________?
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A. Acts as an accelerator

B. Initiating the setting reaction

C. increasing the working time of alginate impression material

D. Provides gel strength

302. Which of the following best describes the working time of elastomeric impression material ?
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A. Loss of luster of impression material

B. Just before the start of appearing elastic properties of impression material

C. After the start of appearing elastic properties of impression material

D. Just after the start of appearing elastic properties of impression material

303. The ranking of tear strength from the lowest to highest of all impression materials generally is as follows_______________?
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A. Hydrocolloids, polyether, silicones, polysulfide

B. Hydrocolloids, silicones, polyether, polysulfide

C. Silicones, hydrocolloids, polyether, polysulfide

D. Polysulfide, hydrocolloids, silicones, polyether

304. Wash or corrective impression is done by______________?
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A. Impression paste

B. Impression plaster

C. Rubber base impression material

D. Alginate

305. All of the following statements about Type II silicon impression material are true EXCEPT_______________?
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A. They exhibit a very low setting shrinkage

B. They evolve hydrogen when cast if they are not fully cured

C. They set by condensation polymerisation

D. They have a lower tear resistance than polysulphide rubbers

306. In a patient with allergy to costume jewelry, which of the following is contraindicated______________?
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A. High gold

B. Low gold

C. Palladium Ag

D. Ni Cr
307. The best fuel gas when used with oxygen is______________?
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A. Natural gas

B. Propane

C. Acetylene

D. Hydrogen

308. Within an hour after cementation of cast gold onlay patient complains of shooting pain every time the teeth comes together Most probable explanation is ______________?
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A. Galvanic current caused by gold onlay occluding with a large restoration

B. Retained cement in gingival sulcus

C. Supracocclusion of restoration

D. Excess acid in mix

309. Binder in phosphate bonded investment is______________?
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A. Magnesium oxide & Phosphate

B. Magnesium oxide & Ortho Phosphoric acid

C. Magnesium oxide & Phosphoric acid

D. Magnesium oxide & Monoammonium phosphate
310. Which material undergoes hysteresis ?
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A. Impression plaster

B. Metallic oxide paste

C. Irreversible hydrocolloid

D. Reversible hydrocolloid
311. Impression material that Do NOT harden by chemical reaction_______________?
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A. Plaster of paris

B. Impression compound

C. Alginate

D. Zinc oxide eugenol

312. 18-B Stainless steel orthodontic wire has_______________?
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A. 18% Chromium 8% Cobalt

B. 18% Chromium 8% Nickel

C. 18% Nickel 8% Chrominum

D. 18% Carbon 8% Iron

313. Casting shrinkage is compensated by_______________?
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A. Hygroscopic expansion

B. Thermal expansion

C. All of the above

D. Wax expansion

314. Which of the following impression material is elastic________________?
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A. Impression compound

B. Polyvinyl siloxane

C. Zinc Oxide eugenol (ZOE) paste

D. Wax

315. The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?
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A. Base plate wax

B. Boxing wax

C. Utility wax

D. Beading wax

316. Trisodium phosphate in alginate acts are_______________?
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A. Plasticizer

B. Reactor

C. Accelerator

D. Retarder
317. The term ordered hardening heat treatment used in which of the following dental alloys ?
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A. Silver-Palladium

B. Nickel-Titanium

C. Nickel-Chromium

D. Gold-Copper
318. One of the most important advantages of truly elastic impression material would be its capacity for______________?
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A. With drawl without permanent distortion

B. Close adaptation to soft tissues

C. Reproduction of surface details

D. Compatibility with gypsum products

319. Accelerators and retarders are used with gypsum products mainly to control_______________?
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A. Hardness of the set product

B. Setting expansion

C. None of the above

D. Setting time
320. Heat hardening is the process done at_______________?
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A. Heating at 750C and then quenching to room temperature

B. Heating 750C and slowly cooling to zero degree

C. Heating quickly upto 450C followed by sudden quenching

D. Heating upto 250C for 15 to 30 min