1. Cerrobend alloy islow fusing metal for positioning or shielding stentlow fusing material for removing memory patternshigh fusing metal for removing memory patternshigh fusing metal for positioning or shielding stentQuestion 1 of 20 2. in size the largest porosities in a casting are of which typegas inclusionmicroporositypin holesuck backQuestion 2 of 20 3. the function of monomer added to the heat curing resin polymer is primarily toreduce the porosity and increase the strength of the appliancestart the polymerisation reactionprovide adhesion of the resin base to the teethproduce a plastic mass that can be packed into the moldQuestion 3 of 20 4. Continues use of vibrator during investing leads to?Surface roughnessRandom nodule formationDiscolorationSurface irregularitiesQuestion 4 of 20 5. In relation to gypsum products, prolonged spatulation time will lead toIncrease in hygroscopic expansionReduced setting timeIncrease in hardnessIncrease compressive strengthQuestion 5 of 20 6. Type I GIC isLutingResin modifiedLiningRestorativeQuestion 6 of 20 7. Etching of feldspathic ceramic:35% Phosphoric acidHCLHN03HF acidQuestion 7 of 20 8. Which of the following best describes "strain hardening" or "work hardening"?softening a metal at room temperaturesoftening a metal by controlled heating and coolinghardening (or deformation) of a metal at room temperaturehardening (or deformation) of a metal at a very high temperatureQuestion 8 of 20 9. for a successful metal ceramic restoration both the metal and porcelain must have closely matchedcompressive strengthcoefficient of thermal expansionsolidification shrinkagespecific gravityQuestion 9 of 20 10. the primary purpose of rinsing a set impression with a watery mix of dental stoneto prevent further gelationto increase the gel strengthto remove residual saliva from the surface of impressionto retard shrinkage due to syneresisQuestion 10 of 20 11. Any marked distortion of the casting is related toImproper temperature controlSuck back porosityDistortion of the wax patternLocalised shrinkageQuestion 11 of 20 12. each crystal of the polycrystalline metal is termedbushgrainseeddendriteQuestion 12 of 20 13. metal ceramic restorations may fail due to fracture of the ceramic material .this can be best avoided ifocclusal forces are minimalthe casting is designed to reduce stress concentration in the ceramic materialthe metal is not over 0.5 mm thickthe ceramic material is at least 1.5 mm thickQuestion 13 of 20 14. What chemical is added to prevent polymerization of polymethylmethacrylate during storage:HydroquinoneBenzoyl peroxideTertiary aminesCamphorquinoneQuestion 14 of 20 15. Pinhole porosities are related toDistortion of wax patternCasting investment junctionSprue casting dissociationEntrapement of gas during solidificationQuestion 15 of 20 16. Hardening heat treatment for gold copper alloys involvesQuenching immediately after recrystallisationHeating to 700 degree C for 10 min followed by quenchingQuenching immediately after castingHeating to 350 degree C for 15-30 min followed by quenchingQuestion 16 of 20 17. Stiffness is related to?Degree of elastic resistanceDegree of plastic resistanceResistance to elastic deformationResistance to plastic deformationQuestion 17 of 20 18. Liquid which shows thickening on increasing strain is calledThixotropicDilatantNewtonianPseudoplasticQuestion 18 of 20 19. the penetration of the fissure sealant into the fissuresis the result of a chemical bond between the sealant and enamelmust occur before the polymerisation of the materialis independent of the chemical composition of the enamelis not influenced by the wettability of the enamelQuestion 19 of 20 20. titanium casting is doneusing cad-cam techniqueunder vaccum in argon atmosphereunder air pressure in nitrogen atmospherein specifically fabricated aluminium vanadium cruciblesQuestion 20 of 20 Loading...
