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.Management Sciences
Category: Restorative Resins
Marginal leakage related to temperature change occurs to the greatest extent with_______________?
A. Amalgam alloy
B. Unfilled resin
C. Composite resin
D. Direct filling gold
Light cure system, side effect is____________?
A. Iritis
B. Cataract
C. Conjunctivitis
D. Retinal damage
Bonding of composite resins to tooth structure is by________________?
A. Covalent bond
B. Ionic bond
C. Mechanical
D. Vanderval forces
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
Which of the following absorbs maximum amount of water ?
A. Microfilled resin
B. Macrofilled resin
C. Hybrid
D. Light cure activated
When restoring a tooth with resin material, acid etching can do all of the following except______________?
A. Increase the surface area
B. Permit chemical bonding between resin and enamel
C. Create surface irregularities in enamel for better mechanical retention of resin
D. Condition the tooth surface for better wetting
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
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