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

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. 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

3. 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

4. A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________?

   A. Injecting technique
   B. Laminate technique
   C. Immersion technique
   D. Tempering technique

5. 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

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

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

7. The basic constituent of reversible hydrocolloid impression material is________________?

   A. Agar
   B. Alginic acid
   C. Gelatin
   D. alginate

8. The best way to remove a hydrocolloid impression from the patient’s mouth is____________?

   A. Slight rocking of the impression to disengage it from the undercut
   B. Wetting the periphery of the impression with moist cotton to break the peripheral seal
   C. Sudden jerking of the impression to prevent tearing
   D. Supporting the impression along with the tray to prevent disengaging of the tray alone

9. 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

10. Best impression material to be used for securing impression after crown preparation_______________?

    A. Alginate
    B. Agar
    C. Elastome
    D. Zno paste