COMPOSITEBy: E-Dental

Size of monomer/resin and amount of filler content effects which property of composite?1.Thermal expansion2.Thermal Contraction3.Biocompatibility4.Both 1 and 25.Polymerization shrinkage

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Silanes are considered coupling agents because they form a bond between :1.Resin (organic matrix) and Filler (inorganic) phases.2.Resin (organic matrix) and initiator.3.Initiator and activator to form a system.4.Both 1 and 35.None of the above

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Beneficial properties contributed by the filler are:1.Lowering coefficient of thermal expansion2.Increased surface hardness and strength3.Lowering setting contraction/polymerization shrinkage4.All of the above5.None of the above

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Following resin is also called as BOWEN’s RESIN:1.TEG-DMA2.Bis GMA3.UDMA4.Unfilled acrylic resin5.Composite

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Regarding visible light cured composite material, which initiator-activator system is correct:1.Camphorquinone - Light2.Benzoin Methyl Ether - Light3.Benzoyl Peroxide – Light4.N, N’ Dimethyl-p-Toluidine – Light5.Both 1 and 3

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Regarding MICROFILLED COMPOSITE, filler (silica) particle size range is:1.0.1 - 1 um2.0.01 - 0.1 um3.0.001 - 0.01 um4.1 - 100 um5.None of the above

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Thickness of the resin that can be converted from monomer to polymer under specific light curing conditions is called?1.Degree of conversion2.Configuration Factor3.Depth of cure4.Oxygen inhibited layer5.None of the above

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Which of the following is true regarding the effects of polymerization shrinkage :1.Break in marginal seal2.Development of stresses within composite 3.Development of stresses on tooth4.All of the above5.Only 1 and 2

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Which is true about C-Factor :1.It is the ratio of Unbounded to bounded surface2.It is the ratio of Bounded to unbounded surface3.More value of C-Factor shows less stresses4.All of the above5.Only 1 and 3

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Relation between filler and COTE is:1.Increasing the filler causes increase in value of COTE2.No relation exists between filler content and COTE3.Increasing filler content causes decrease in value of COTE4.Decrease in filler cause decrease in COTE5.None of the above

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A layer of resin, collagen and dentine produced after acid etching of dentine and application of adhesive/DBA is called:1.Resin Tags2.Smear layer3.Hybrid layer4.Oxygen inhibited layer5.Conditioned dentine

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Some hybrid composites contain blend of three different particle sizes of filler. The filler content/percent in these composites can be upto:1.70% by wt2.85% by wt3.75% by wt4.95% by wt5.90% by wt

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For light activated composites, the typical rise in temperature is about:1.1-5’C2.5-15’C3.20-25’C4.10’C5.There is no rise in temperature as polymerization is an endothermic process

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C-Factor for class 1 cavity design is:1.0.22.0.53.54.25.0

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References:

McCabe Dental Materials

Phillips Dental Materials

Craig’s Dental Materials

www.uhs.edu.pk