Polymerisation of heat-cured methyl methacrylate is initiated by______________?

Related Mcqs:

1. Benzoin methyl ether in a polymer indicates that they may be cured in the presence of________________?

   A. UV light
   B. Visible light
   C. Infrared light
   D. Diketone

2. 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

3. The advantage of unfilled methyl methacrylate is that______________?

   A. It can be finished smoothly
   B. It has a low degree of flow
   C. It’s non-irritation to pulp
   D. It’s wear resistant is high

4. Hydroquinone is added to methyl methacrylate monomer_________________?

   A. To prevent polymerization during storage
   B. To initiate release of free radicalls
   C. To enable polymerization reaction at room temperature
   D. All of the above

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

   A. Biological properties
   B. Thermal properties
   C. Mechanical properties
   D. Esthetic properties

6. All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?

   A. The former have a lower molecular weight
   B. The former have higher residual monomer content
   C. The former are more porous
   D. The former have greater transverse strength

7. The % of free monomer in a heat – cured acrylic resin is_______________?

   A. 3% to 5%
   B. 8% to 10%
   C. 0.2% to 0.5%
   D. 0.6% to 0.8%

8. The formation of the dental lamina is initiated by______________?

   A. Forebrain
   B. Rathke’s pouch
   C. Neural crest cells
   D. Odontoblasts

9. 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

10. 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