Best material for duplicating cast is_______________?

Related Mcqs:

1. The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?

   A. 0%
   B. 2 to 3%
   C. 5 to 10%
   D. <1%

2. The plasticizers used in polyether impression material is_______________?

   A. polyether polymer
   B. Colloidal silica
   C. Glycol ether
   D. Di-vinyl poly (dimethyl siloxane)

3. The most mucostatic impression material is_______________?

   A. Thin mix of plaster of paris
   B. Zinc oxide eugenol impression paste
   C. Free flowing wax
   D. Reversible hydrocolloids

4. 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

5. Most biocompatible material in oral cavity is_______________?

   A. Platinium
   B. Palladium
   C. Titanium
   D. Gold

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. 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

8. Model plaster (white) used to cast study models before mixing with water, is largely composed of____________?

   A. CaO
   B. CaCO3
   C. (CaSO4)2-½H2O
   D. CaSO4-2H2O

9. Placing cast under tap water is to be avoided as______________?

   A. H2O interferes with hygroscopic expansion
   B. H2O inhibits polymerization of dental resin
   C. H2O interferes with Crystallization of dihydrate
   D. Gypsum is slightly soluble in water and the surface of the cast will be eroded

10. Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?

    A. Type I – Soft
    B. Type II – Hard
    C. Type III – Hard
    D. Type IV – Extra Hard