The main difference between dental stone and dental plaster is______________?

Related Mcqs:

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

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

2. Water powder ratio of dental stone and plaster is respectively_________________?

   A. 0.28 and 0.6 B. 0.6 and 0.28 C. 0.6 and 3.2 D. 0.28 and 0.98...

3. The main ingredient in dental plaster in_______________?

   A. Calcium sulphate hemihydrate B. Calcium phosphate C. Calcium anhydrate D. Calcium sulphate dihydrate...

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

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

5. Balanced stone is dental stone_______________?

   A. Which undergoes rapid expansion B. In which accelerators or retarders have been added according to need C. In which amount of water of hydration is controlled D. In which the crystals are all of uniform size...

6. 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...

7. Plaster of paris is mixed in________________?

   A. Plastic bowl B. Rubber bowl C. Glass bowl D. Metal bowl...

8. In plaster of paris the setting time is primarily altered by_________________?

   A. Altering P / L Ratio B. Altering temperature of mixing water C. Speed and length of hand spatulation D. Addition of accelerators and retarders...

9. Impression plaster containing potato starch is called______________?

   A. Plaster of paris B. Soluble plaster C. Anti – expansion solution D. Die stones...

10. Plaster mix____________?

    A. Rapid spatulation results in decreased setting time B. 2% potassium sulphate is accelerator C. Citrates are retarders D. All of the above...