Dental Materials MCQs

Page No. 12

All of the following statements are true for zinc oxide eugenol cements except______________?


aIncrease in temperature and humidity shorten the setting time


bThe mix appear thick at the start of mixing but after 30 seconds of additional spatulation it becomes more fluid


cWater accelerates but heat retards the setting of zinc oxide eugenol cements


dboth B & C


View Answer both B & C

Which glass ionomer cement develops early resistance to water intake on setting ?


aReinforced auto care glass ionomer cement


bCompomer


cResin modified glass ionomer cement


dCeramic reinforced glass ionomer cement



About zinc oxide eugenol all are true except_______________?


aZnO is converted to Zn(OH)2


bReaction is autocatalytic


cWater is the byproduct of reaction


dDehydrated ZnO reacts with dehydrated eugenol



Frozen slab technique of mixing zinc phosphate is used for_______________?


aCementing crowns


bTemporary dressing


cbase


dcementing orthodontic bands


View Answer Cementing crowns

Strength of zinc phosphate is effected by_______________?


aTemp of glass slab


bP:L ratio


cConsistency of mix


dAlteration of mixing time


View Answer P:L ratio

Which of the following acts as accelerator in Zinc oxide eugenol______________?


aZnCl2 + Eugenol


bZnCl2 + ZnSO2


cEugenol + ZnO


dZn(OH)2 + ZnO


View Answer ZnCl2 + ZnSO2

Frozen slab technique is applicable to_____________?


aZinc phosphate cement


bGlass Ionomer cement


cZinc oxide Eugenol cement


dResin cement


View Answer Zinc phosphate cement

Age hardening is a process done at______________?


aHeating up to 200 – 450°C for 15 – 30 min and quenching in water


bHeating at 700°C for 10 – 15 min and quenching in water


cHeating at 700°C for 1 hour and quenching in water


dHeating above 700°C for 30 min and quenching in water



The principal constituent of set silicate cement matrix is_______________?


aHydrated Aluminium Phosphate


bHydrated Aluminium Phosphate with calcium fluoride


cHydrate Aluminosilicate gel


dHydrated Aluminium phosphate crystal, CAF2 alluminosiliate gel



Torsional force is_______________?


aCompression


bTensile force


cShear


dTransverse bending force


View Answer Shear

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