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.Management Sciences
Category: Restorative Resins
Most advantageous indication of acid etching is______________?
A. Decrease micro leakage
B. Decrease polymerization shrinkage
C. Decrease coefficient of thermal expansion
D. Decrease porosity in restorative material
The main advantage of composites over unfilled direct filling resin is their_____________?
A. Higher solubility in saliva
B. Lower modulus of elasticity
C. Esthetic excellence
D. Lower thermal co-efficient of expansion
Which of the following provide opacity to composite ?
A. TEGDMA
B. BIS-GMA
C. Ti02
D. None of the above
Which one of the following is used as filler in composite resins ?
A. Quartz
B. Silicates
C. Zinc particles
D. Aluminium
The restoration which shows percolation and shrinkage along the margins is_____________?
A. Composites
B. Unfilled resins
C. Amalgam
D. Polycarboxylate
Acrylic (cold cure)______________?
A. Melts at 100°C
B. Softens at 100°C
C. Still requires heat for polymerization
D. Produces heat during polymerization
During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?
A. 25°C
B. 37°C
C. 50°C
D. 60°C
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
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
What is the disadvantage of using composites as restorative material ?
A. Increased thermal conductivity
B. Decreased wear resistance
C. Decreased thermal conductivity
D. None of the above
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