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.Management Sciences
Category: Restorative Resins
Macromolecules in Dental Resin is attached by______________?
A. Covalent bonds
B. sonic bonds
C. Vander Wall’s Forces
D. Hydrogen Bonds
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
Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
A. 10 um – 20 um
B. 3 um – 9 um
C. 50 um – 110 um
D. 200 um – 250 um
Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ?
A. Excessive expansion
B. Low impact strength
C. Excessive shrinkage
D. Excessive brittleness
VLC resins are also called as______________?
A. Microwave-activated resins
B. Tertiary amine-activated resins
C. Light activated resins
D. Heat activated resins
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
Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________?
A. Addition of grain refining agents
B. Addition of difunctional monomers
C. Increasing the amount of heat required for linear polymerization
D. Incorporation of terminating agents
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 constituents is common in occlusal sealants, bonding agents, composite resins ?
A. BIS GMA
B. Polymethyl methacrylate
C. Benzoin methyl ether
D. Silica filter
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