Type III Dental gypsum is__________________?

Related Mcqs:

1. The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is_______________?

   A. Alpha – hemihydrates
   B. Beta – hemihydrates
   C. Calcium sulphate dihydrate
   D. Orthorhombic anhydrate

2. Powders of dental plaster and dental stone differ mainly in____________?

   A. Solubility
   B. Shelf life
   C. Chemical formula
   D. Particle porosity

3. The main difference between dental stone and dental plaster is______________?

   A. Chemical composition
   B. Self life
   C. Sharpe and size of particles
   D. Solubility in water

4. High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?

   A. Have less marginal breakdown
   B. Are workable at lower Hg-alloy ratio
   C. Have a higher ratio of tensile to compressive strength
   D. Have less resistance to tarnish and corrosion

5. The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________?

   A. 19
   B. 20
   C. 21
   D. 26

6. As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?

   A. 0.05
   B. 0.10
   C. 0.15
   D. 0.20

7. Type I gypsum product is also called_______________?

   A. Impression plaster
   B. Class I stone / Hydrocal
   C. Class II stone/Densite
   D. Model plaster

8. Accelerators and retarders are used with gypsum products mainly to control_______________?

   A. Setting time
   B. Setting expansion
   C. Hardness of the set product
   D. None of the above

9. Modiffiers are added to gypsum mainly to_______________?

   A. Modify setting time
   B. Modify setting expansion
   C. Modify strength
   D. Decrease the porosity

10. Gypsum product having least expansion_____________?

    A. Impression plaster
    B. Model plaster
    C. Stone plaster
    D. Die stone