Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor_____________?

Related Mcqs:

1. The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?

   A. 3:1
   B. 4:1
   C. 10:1
   D. 5:1

2. Which of the following is NOT true of polymethyl methacrylate ?

   A. Knoop hardness number 18 to 20
   B. Tensile strength of 60 MPa
   C. Density of 1.13 g/cm3
   D. Modulus of elasticity of 3.4 GPa

3. 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

4. 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

5. Cross linking in denture base resin is contributed by_____________?

   A. Glycol dimetharylate
   B. Benzoyl peroxide
   C. N-para toluidine
   D. Methyl methacrylate

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. Polymerisation of heat-cured methyl methacrylate is initiated by______________?

   A. Tertiary amine
   B. Benzoyl peroxide free radical
   C. Hydroquinone
   D. Methyl ether

8. If resin is packed in sandy stage what will be seen in the processed denture ?

   A. Distortion
   B. Porosity
   C. Inhomogeneous colour
   D. Increased strength

9. If resin is packed in sandy stage what will be seen in the processed denture ?

   A. Distortion
   B. Porosity
   C. Inhomogeneous colour
   D. Increased strength

10. One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?

    A. Prevent galvanic action
    B. Are practically insoluble in oral fluids
    C. Adapt to the walls of the cavity better
    D. Have a higher coefficient of thermal expansion