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
Related Mcqs:
- 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 - Polymerisation of heat-cured methyl methacrylate is initiated by______________?
A. Tertiary amine
B. Benzoyl peroxide free radical
C. Hydroquinone
D. Methyl ether - 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 - 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 - 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 - 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 - 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 - Boiling point of methyl methacrylate________________?
A. B.P of water
B. < B.P of water
C. Equal of BP of water
D. Is at normal room temperature - Palladium is added to polyvinyl siloxane to_____________?
A. Act as a scavenger
B. Helps as surfactant
C. Acts as plasticizer
D. Acts as a catalyst - Which one of the following elements is NOT added is small amount to be used as grain refiners ?
A. Iridium
B. Ruthinium
C. Indium
D. Platinum
