1. Soldering flux is composed of all of the following EXCEPT one. Which one is the EXCEPTION?sodium pyroboratealumsilicaboraxQuestion 1 of 20 2. Best material for casting base metal crown isHigh refractory silica bondedGypsum bondedPhosphate bondedSilica bondedQuestion 2 of 20 3. most common reason for incomplete casting when using a centrifugal casting machine ishollow spaceincreased porosity of the investmentlarge reservoirnarrow sprueQuestion 3 of 20 4. a thinner mix of gypsum bondeded investment will result inincreases thermal expansiondecrease setting expansionproduce a smoother castingincreases setting expansionQuestion 4 of 20 5. All of the following statements are true regarding glass ionomer restorations,exceptglass ionomer adheres to mineralized tooth tissueglass ionomer is often the ideal material of choice for restoring root surface caries in patients with high caries activityglass ionomers are somewhat esthetic and polish much better than compositesthe best surface finish for a glass ionomer restoration is that obtained against a surface matrixQuestion 5 of 20 6. Which phase of the amalgam reaction is prone to corrosion in clinical restorations?Gammagamma-threegamma-twogamma-oneQuestion 6 of 20 7. main advantage of zinc phosphate over GIC ismore biocompatibilityincrease modulus of elasticityincreased tensile strengthincrease compressive strengthQuestion 7 of 20 8. What chemical is added to prevent polymerization of polymethylmethacrylate during storage:HydroquinoneTertiary aminesCamphorquinoneBenzoyl peroxideQuestion 8 of 20 9. Type I GIC isResin modifiedLutingRestorativeLiningQuestion 9 of 20 10. Shrinkage porosity is related toTemperatureSprue sizeMolten metalInlay waxQuestion 10 of 20 11. Polishing agent which is known as whitening agentNone of the aboveChromium oxideRougeIron oxideQuestion 11 of 20 12. Dental porcelain is manufactured by a process known asCrystallisationDevitrificationCreaming and bisque bakeFrittingQuestion 12 of 20 13. Best cementing medium for self retained all ceramic crown isGICChemical cure resinRMGICDual cure resinQuestion 13 of 20 14. Which of the following cements provide maximum resistance to decalcification while placing bands on molarGICZinc phosphateSilicatePolycarboxylateQuestion 14 of 20 15. Modulus of elasticity/tensile strength of brittle materials is measured byCharpy testCold bend test3-point bend testDiametrical compresssion testQuestion 15 of 20 16. By product of setting reaction of condensation silicon:Ethyl alcoholWaterAcetoneHydrogenQuestion 16 of 20 17. Principle purpose of annealing isTo eliminate strain hardeningTo make the gold cohesiveTo remove the absorbed gasTo change metal metallographicallyQuestion 17 of 20 18. dental plaster powder and dental stone powder differ mainly insolubilityshelf lifechemical formulaparticle porosityQuestion 18 of 20 19. Young's modulus is defined as:Stress/strain above elastic limitStress/strain below elastic limitLimit where a material shows plastic defonnationArea under the stress strain curve till point of fractureQuestion 19 of 20 20. After mixing powder and liquid in case of alginate impression material, gelation will occur in what time (at room temperature)?1-2 minutes6-7 minutes3-4 minutes10-12 minutesQuestion 20 of 20 Loading...
