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.Management Sciences
Category: Restorative Resins
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
The commonly used laser for curing composite resin is______________?
A. Nd:YAG
B. CO2
C. ER:YAG
D. Argon
Etchant preferred in gel from than in liquid form________________?
A. Better control over placement
B. Enhance and concentrate the action of acid
C. Helps in visualization while placement
D. None of the above
The chemical used to etch enamel is_______________?
A. Zinc oxide
B. Methyl methacrylate
C. Phosphoric acid
D. Eugenol
The particle size in microfilled composites is_____________?
A. 0.05 to 0.04mm
B. 0.5 to 1.0 microns
C. 0.01 to 0.1 microns
D. 0.3 to 0.4mm
Composite resins in comparison to acrylic have_______________?
A. Low compressive strength
B. High abrasive resistance
C. High water absorption
D. High polymerization shrinkage
Inorganic phase of the composites aid in_______________?
A. Increasing the mechanical strength
B. Decreasing the coefficient of thermal expansion
C. Reducing the polymerization shrinkage
D. All of the above
Subsurface porosity is due to_____________?
A. Thermal changes
B. Thickness of the resin
C. Lack of temperature
D. Packing past the dough stage
Denture acrylics contain cross-linking agents mainly to improve their_____________?
A. Internal color
B. Tissue compability
C. Surface hardness
D. Craze resistance
About polymerization shrinkage of composite all are true, except______________?
A. Polymerization shrinkage is greater if bonded surface area is lesser than unbounded surface area
B. Polymerization shrinkage is high if within the enamel margins
C. Acid etching and priming will decrease polymerization shrinkage
D. Microleakage can occur because of polymerization shrinkage
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