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

A. Imbibition
B. Syneresis
C. Hysteresis
D. Gelation

272. The impression with the least dimensional change upon disinfection is_______________?

A. Addition poly silicone
B. Agar-agar
C. Polysulphide
D. Polyether

273. Palladium is added to polyvinyl siloxane to_____________?

A. Act as a scavenger
B. Helps as surfactant
C. Acts as plasticizer
D. Acts as a catalyst

274. Immediate pouring of impressions is most critical in_____________?

A. Condensation polysillicon
B. Addition Polysilicon
C. Polyether
D. A and B

275. The impression material used to record the prepared areas on abutment teeth is______________?

A. High viscosity elastomeric impression material
B. Medium viscosity elastomeric impression material
C. Low viscosity elastomeric impression material
D. None of the above

276. Alginate impression material is________________?

A. Non-elastic impression material
B. Thermoplastic impression material
C. More mucostatic than ZOE
D. Less mucostatic than ZOE

277. Syringe material is______________?

A. High viscosity elastomer
B. Medium viscosity elastomer
C. Medium & low viscosity elastomer
D. Low viscosity elastomer

278. The impression for a diagnostic cast of a partial edentulous mouth should be taken in_______________?

A. Impression wax
B. Modelling compound
C. Hydro-colloid
D. Hydro cal

279. Agar impression materials differ from alginate impression materials in that the former sets by_______________?

A. Mechanical action of saliva
B. Physical change
C. Evolution
D. Chemical change

280. Which material undergoes hysteresis ?

A. Irreversible hydrocolloid
B. Reversible hydrocolloid
C. Impression plaster
D. Metallic oxide paste


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