Dental Materials MCQs

Page No. 58

Dentin conditioner has the following function______________?


aRemoves smear layer

✓


bIncreases surface energy of dentin

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cForms a thin resin layer over exposed collagen fibrils

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dHelps in bonding with composite

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View Answer Removes smear layer

Residual monomer content of chemically activated resins is______________?


a0.2% to 0.5%

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b2% to 5%

✓


c0.3% to 0.5%

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d0.2% to 5%

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View Answer 2% to 5%

The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?


a3:1

✓


b4:1

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c10:1

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d5:1

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View Answer 3:1

Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?


a10 um – 20 um

✓


b3 um – 9 um

✖


c50 um – 110 um

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d200 um – 250 um

✖


View Answer 10 um – 20 um

During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?


a25°C

✖


b37°C

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c50°C

✖


d60°C

✓


View Answer 60°C

Etchant preferred in gel from than in liquid form________________?


aBetter control over placement

✓


bEnhance and concentrate the action of acid

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cHelps in visualization while placement

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dNone of the above

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Which of the following is NOT true of polymethyl methacrylate ?


aKnoop hardness number 18 to 20

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bTensile strength of 60 MPa

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cDensity of 1.13 g/cm3

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dModulus of elasticity of 3.4 GPa

✓



Cold cure acrylic expand in water by___________?


a1% by volume 0.23% by weight

✓


b10% by volume 0.23% by weight

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c0.1% by volume 0.23% by weight

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dNone of the above

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VLC resins are also called as______________?


aTertiary amine-activated resins

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bMicrowave activated resins

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cLight activated resins

✓


dHeat activated resins

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Most advantageous indication of acid etching is______________?


aDecrease micro leakage

✓


bDecrease polymerization shrinkage

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cDecrease coefficient of thermal expansion

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dDecrease porosity in restorative material

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