dental materials MCQs – Page 17

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

dental materials Mcqs
321. Shape memory is seen in________________?
comments icon0

A. Aluminium

B. NITTINOL wire

C. Stainless steel wire

D. TMA wire

322. Which of the following refractory is used to counteract most of the expansion________________?
comments icon0

A. Quartz

B. Corundum

C. Tridymite

D. Cristobalite
323. In plaster of paris the setting time is primarily altered by_________________?
comments icon0

A. Speed and length of hand spatulation

B. Altering P / L Ratio

C. Altering temperature of mixing water

D. Addition of accelerators and retarders
324. A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________?
comments icon0

A. Immersion technique

B. Laminate technique

C. Tempering technique

D. Injecting technique

325. A rough / Chalky surface of the cast is due to_______________?
comments icon0

A. Not waiting for 20 min before pouring

B. Air incorporation in the mix

C. All of the above

D. High speed accelerator

326. Heavy and light body impression materials are use with______________?
comments icon0

A. Reversible hydrocolloid

B. Silicone

C. A and B

D. Mercaptan

327. Agar impression materials differ from alginate impression materials in that the former sets by_______________?
comments icon0

A. Mechanical action of saliva

B. Evolution

C. Physical change

D. Chemical change

328. The deoxidizing agent added to dental alloys is______________?
comments icon0

A. Silver

B. Copper

C. Palladium

D. Zinc
329. Balanced stone is dental stone_______________?
comments icon0
A. In which accelerators or retarders have been added according to need

B. In which the crystals are all of uniform size

C. Which undergoes rapid expansion

D. In which amount of water of hydration is controlled

330. Which one of the following elements is NOT added is small amount to be used as grain refiners ?
comments icon0

A. Platinum

B. Iridium

C. strong>

D. Ruthinium

331. Air bubbles formed on the surface of casting is probably due to________________?
comments icon0

A. Improper casting pressure

B. Improper heating of the investment

C. Improper angulation of sprue

D. Improper wetting of the wax pattern by the investment
332. Which of the waxes are derived from the lignite_________________?
comments icon0

A. Inlay wax

B. Montan wax

C. Paraffin wax

D. Microcrystalline wax

333. Casting flux is used to_______________?
comments icon0

A. increase the melting point of the flux

B. Flaring the point of the sprue attachment

C. None of the above

D. Prevent the oxidation of the metal during melting

334. The plasticizers used in polyether impression material is_______________?
comments icon0

A. polyether polymer

B. Colloidal silica

C. Glycol ether

D. Di-vinyl poly (dimethyl siloxane)

335. The maximum carbon content of steel used in dentistry is__________________?
comments icon0

A. 19%

B. 1.7%

C. 2%

D. 4%

336. Mechanical properties of Cp Titanium are similar to alloys_____________?
comments icon0

A. Type VII and type VIII gold

B. None of the above

C. Type III and Type IV gold

D. Type V and type VI gold

337. ADA specification number of gypsum products are described under____________?
comments icon0
A. 25

B. 4

C. 12

D. 1

338. Retarder in Zinc oxide eugenol is______________?
comments icon0

A. Alcohol

B. CaCl2

C. Zinc acetate

D. Glycerine
339. A laminate impression technique utilizes_______________?
comments icon0

A. Syringe agar and tray agar

B. Syringe agar and chilled tray alginate

C. Syringe agar and impression compound

D. Chilled alginate and impression compound

340. Passivating alloys are_______________?
comments icon0

A. Cr, Gold, Ti

B. Cr, Fe, Ti

C. Cr, Al, Ti

D. Cr, Mo, Ti