Dental Materials MCQs

Page No. 58

Dentin conditioner has the following function______________?


aRemoves smear layer


bIncreases surface energy of dentin


cForms a thin resin layer over exposed collagen fibrils


dHelps in bonding with composite


View Answer Removes smear layer

Residual monomer content of chemically activated resins is______________?


a0.2% to 0.5%


b2% to 5%


c0.3% to 0.5%


d0.2% to 5%


View Answer 2% to 5%

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


a3:1


b4:1


c10:1


d5:1


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


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


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


cHelps in visualization while placement


dNone of the above



Which of the following is NOT true of polymethyl methacrylate ?


aKnoop hardness number 18 to 20


bTensile strength of 60 MPa


cDensity of 1.13 g/cm3


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


c0.1% by volume 0.23% by weight


dNone of the above



VLC resins are also called as______________?


aTertiary amine-activated resins


bMicrowave activated resins


cLight activated resins


dHeat activated resins



Most advantageous indication of acid etching is______________?


aDecrease micro leakage


bDecrease polymerization shrinkage


cDecrease coefficient of thermal expansion


dDecrease porosity in restorative material



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