Trisodium phosphate in alginate acts are_______________?

Related Mcqs:

1. Trisodium phosphate added to alginate contributes towards_______________?

   A. increasing the working time of alginate impression material
   B. Acts as an accelerator
   C. Initiating the setting reaction
   D. Provides gel strength

2. Alginate impression material is similar to Agar-agar impression material in the following respect________________?

   A. Gelation increase in both on increase in temperature
   B. Mixing time is increased to reduce the setting time
   C. Deformation during removal of impression occurs due to distortion of gel fibers
   D. Both can be re-used for fresh impressions

3. Dustless alginate is produced by______________?

   A. Reducing the diatomaceous earth
   B. Adding heavy metal salts
   C. Coating with dihydric alcohol
   D. Altering the matrix

4. Final product in alginate is________________?

   A. Sodium alginate
   B. Potassium alginate
   C. Trisodium phosphate
   D. Calcium alginate

5. The water powder ratio of alginate is______________?

   A. 100 ml of water to 60 gms of powder
   B. 40 ml of water to 40 gms of powder
   C. 40 ml of water to 15 gms of powder
   D. 15 ml of water to 40 gms of powder

6. During setting of alginate impression materials________________?

   A. Trisodium phosphate reacts with sodium alginate
   B. Trisodium phosphate reacts with calcium sulphate
   C. Colloidal changes to sol
   D. Material in contact with soft tissues sets last

7. 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

8. Alginate impression material is________________?

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

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

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

10. All of the following statements about an alginate impression are EXCEPT________________?

    A. It should be rapidly displaced from the mouth
    B. It may exhibit fluid exudates on the surface as a result of imbibition of water
    C. It will take up water and expand if kept wet
    D. It will shrink as a result of syneresis