1. Green shrinkage seen in :Phosphate Bonded InvestmentGypsum Bonded investmentEthyl Silicate bonded investmentIt is seen in all types of investmentsQuestion 1 of 20 2. the primary oxygen scavenger in noble metal casting alloy iscoppersilverironzincQuestion 2 of 20 3. Which of the following is used for making blades and sharp surgical instruments:none of the aboveAustenitic steelmartensitic steelFerrite steelQuestion 3 of 20 4. Best material for casting base metal crown isPhosphate bondedGypsum bondedSilica bondedHigh refractory silica bondedQuestion 4 of 20 5. Pyroplastic flow in dental porcelainShould optimally be highIs decreased with a low soda/potash ratioIs not an important considerationIs determined by potash formQuestion 5 of 20 6. An impression is taken with addition silicone. What should be done before pouring the cast?Rinse with ketoneWait for sometime before pouringRinse with chloroformMix with some flavouring agentQuestion 6 of 20 7. the function of monomer added to the heat curing resin polymer is primarily toproduce a plastic mass that can be packed into the moldprovide adhesion of the resin base to the teethstart the polymerisation reactionreduce the porosity and increase the strength of the applianceQuestion 7 of 20 8. Hardness of which material is more than enamel:AmalgamGoldCeramicCompositeQuestion 8 of 20 9. the difference between heat cured and cold cured acrylic resin is least significant with respect to the property oftransverse strengthcolor stabilityhardnessinternal porosityQuestion 9 of 20 10. Palladium and platinum are added to base metal alloys to:As grain refinersAct as scavengerReduce brittlenessImpart colorQuestion 10 of 20 11. A very active metal which is gas at room temperature isHydrogenMercuryGalliumOxygenQuestion 11 of 20 12. porcelain are made opaque by the addition of oxides ofboron and magnesiumiron and aluminiumnickel and iridiumtitanium and tinQuestion 12 of 20 13. which orthodontic wire shows shape memoryCo-Cra-TiTMANiTiQuestion 13 of 20 14. Which of the following cements provide maximum resistance to decalcification while placing bands on molarZinc phosphatePolycarboxylateGICSilicateQuestion 14 of 20 15. About pit and fissure sealant which is wrongIt includes enamel bonding agent and resin without filler contentIn sealed fissures prevent odonto pathogenic bacterial growthIf in doubt whether the teeth is carious or not seal it with pit and fissure sealantIt is made of composite resin and sealant to prevent the cAriesQuestion 15 of 20 16. for zinc oxide eugenol all of the following are true exceptolive oil is used as plasticizeraddition of methyl methacrylate resin increases strengthaddition of EBA in concentration of 37-50 percent increases strengthresin decreses the brittleness of set cementQuestion 16 of 20 17. Microwave polymerisation for Acrylic dentures uses:Magnetic FieldRadiationHeat ConvectionHeat ConductionQuestion 17 of 20 18. Casting shrinkage in a type 2 gypsum investment is counteracted by:Hygroscopic setting expansion of investmentThermal expansion of the investmentIncreasing the thickness of casting ringSetting expansion of investmentQuestion 18 of 20 19. best cement for cementation of orthodontic molar bandszinc phosphatesilicophosphateGICsilicateQuestion 19 of 20 20. type IV gold casting alloys are used for fabricatingremovable partial denture frameworksshort span bridgesinlays3/4 crownsQuestion 20 of 20 Loading...
