Porosity present in a acrylic denture is usually the result of______________?

Related Mcqs:

1. The most important disadvantage of acrylic denture base is_______________?

   A. porosity B. Shrinkage C. Tooth breakage D. Water absorption...

2. Acrylic resins were first introduced as a denture base material in______________?

   A. 1925 B. 1937 C. 1951 D. 1956...

3. In heat cure denture base acrylic resins the monomer is___________?

   1. Methacrylate 2. Ethylmethacrylate 3. Methyl ethyl methacrylate 4. Polymethylmethacrylate...

4. 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...

5. Porosity of denture base is due to_______________?

   A. Packing at dough stage B. Curing at 160°F for 9 hrs C. Inadequate pressure D. All of the above...

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. Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ?

   A. Excessive expansion B. Low impact strength C. Excessive shrinkage D. Excessive brittleness...

8. Insufficient closure of the flasks during packing of denture base resin can result in_____________?

   A. Poor colour stability B. Less polymerization shrinkage C. Increase in vertical dimension D. Decrease in vertical dimension...

9. Insufficient closure of the flasks during packing of denture base resin can result in_____________?

   A. Poor colour stability B. Less polymerization shrinkage C. Increase in vertical dimension D. Decrease in vertical dimension...

10. Which of the following is present in the powder of the acrylic resin______________?

    A. Methyl methacrylate B. Benzoyl peroxide C. Hydroquinone D. D-methyl paratolouidine...