To prevent porosity in dental porcelain it should be backed________________?

Related Mcqs:

1. For porcelain fused to metal crown, the porcelain should have ______________?

   A. High fusion expansion B. High fusion temperature C. Linear coefficient of thermal expansion less than that of metal D. Linear coefficient of thermal expansion more than that of metal...

2. Porosity in porcelain at condensation stage depends on_________________?

   A. Shape and size of particle B. Uniform distribution of particle size C. Number of particles D. None of the above...

3. Porosity in porcelain can be prevented by_______________?

   A. Thoroughness of condensation B. Rapidity of firing C. High firing temperature D. All of the above...

4. Quartz is Dental porcelain is______________?

   A. Strengthener B. Binder C. Pigment D. Crack minimzer...

5. Stage recognized in the firing of dental porcelain given below. Which of state is not correct ?

   A. Cold stage bisque B. Low bisque C. Medium bisque D. High bisque...

6. In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?

   A. Throughout the denture B. Near the borders C. In the thickest part D. On the denture surface...

7. To prevent porosity in self-cure acrylic resin, curing should be carried in______________?

   A. Cold water B. Hot water C. Under tap water D. Under vacuum pressure...

8. 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...

9. 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...

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

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