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

Related Mcqs:

1. 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

2. The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?

   A. Utility wax
   B. Base plate wax
   C. Beading wax
   D. Boxing wax

3. K2SO4 in agar-agar is for_______________?

   A. Accelerating the setting stage of gypsum
   B. Increase strength
   C. Give dimensional stability
   D. None of the above

4. The usual concentration of agar used in agar medium is___________________?

   A. 10%
   B. 2%
   C. 5%
   D. 15%

5. Which one of the following impression materials is elastic, sets by a chemical reaction and is catalyzed by chloroplatinic acid_______________?

   A. Condensation silicone
   B. Polyether
   C. Polysulfide
   D. Poly vinyl siloxane

6. Which of the following impression materials is easy to pour and difficult to remove the stone cast from the impression ?

   A. Addition polysilicone
   B. Condensation polysilicone
   C. Polyether
   D. Polysulfide

7. Which one of the following increase the strength and reduce viscosity of agar hydrocolloid impression material_____________?

   A. Borax
   B. Water
   C. Sulfates
   D. Carbonates

8. Which of the following is true about Agar hydrocolloid impression material ?

   A. Liquefies between 71 – 100°C
   B. Solidfies between 50 – 70°C
   C. Facilitates fabrication of metal dyes
   D. Cannot register fine surface details

9. 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

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