1. Addition of fillers in composite resins:Increases wettabilityReduces strengthDecreases polymerization shrinkageDecreases wear resistanceQuestion 1 of 20 2. Animal test used to check biocompatibility of dental material is all exceptImplantation testbuehlar testAme's testLD50 testQuestion 2 of 20 3. During polymerisation from monomer to polymerdensity changes from 1.19 to 0.94 and volume shrinkage 21%density changes from 1.19 to 0.94 and volume shrinkage 7%density changes from 0.94 to 1.19 and volume shrinkage 21%density changes from 0.94 to 1.19 and volume shrinkage 7%Question 3 of 20 4. role if indium in amalgam isto reduce formation of gamma phaseto reduce release of mercury during amalgam polishingto reduce elease of mercury during masticationto reduce formation of gamma 2 phaseQuestion 4 of 20 5. Pinhole porosities are related toEntrapement of gas during solidificationSprue casting dissociationDistortion of wax patternCasting investment junctionQuestion 5 of 20 6. setting time of zinc phospahte cement is retarted bydiluting the liquid with a small amount of waterincreasing the powder liquid ratiodecreasing the rate of addition of powder to liquidincreasing the rate of addition of powder to liquidQuestion 6 of 20 7. Best material for casting base metal crown isSilica bondedPhosphate bondedGypsum bondedHigh refractory silica bondedQuestion 7 of 20 8. the ability of diresct filling gold to be welded together at room temperature is because of its malleability andlack of oxide surface coatinghigh thermal conductivityhigh degree of purityextreme softnessQuestion 8 of 20 9. Cementation failure of a prosthesis cemented with Zinc Polycarboxylate occurs at:Cement tooth interfaceBetween cement layerIn the prosthesis itselfCement and prosthesis interfaceQuestion 9 of 20 10. A base that is typically placed over a calcium hydroxide base (which has been placed over a pulp exposure); is known as:secondary basedirect baseindirect baseprimary baseQuestion 10 of 20 11. the function of monomer added to the heat curing resin polymer is primarily toprovide adhesion of the resin base to the teethreduce the porosity and increase the strength of the appliancestart the polymerisation reactionproduce a plastic mass that can be packed into the moldQuestion 11 of 20 12. Clinical appearance of GIC is dictated byAcid content of liquidParticle size of powderChemical composition of cementViscosity of liquidQuestion 12 of 20 13. each crystal of the polycrystalline metal is termeddendriteseedbushgrainQuestion 13 of 20 14. the activator for autopolymerising resin is likely to bebenzoyl peroxidehydroquinonetertiary amineheatQuestion 14 of 20 15. In hot and dry environment, alginate shrinks byImbibitionAccretionHysteresisSyneresisQuestion 15 of 20 16. Which composite type is 70% to 77% percent filled by volume and has an average particle size ranging from 1 to 3 um.MicrofillsmicrohybridspackableshybridsQuestion 16 of 20 17. Continues use of vibrator during investing leads to?Surface irregularitiesDiscolorationRandom nodule formationSurface roughnessQuestion 17 of 20 18. in size the largest porosities in a casting are of which typegas inclusionmicroporositypin holesuck backQuestion 18 of 20 19. All of the following metals are considered to be base metals EXCEPT one.Which one is the EXCEPTIONnickelsilvercobaltchromiumQuestion 19 of 20 20. Hardening heat treatment for gold copper alloys involvesHeating to 700 degree C for 10 min followed by quenchingQuenching immediately after castingQuenching immediately after recrystallisationHeating to 350 degree C for 15-30 min followed by quenchingQuestion 20 of 20 Loading...
