1. what filler is used in impression compound "alginate"sodium bicarbonatediatomaceous earthsodium phosphatecalcium alginateQuestion 1 of 20 2. The dentist can best control the setting time of irreversible hydrocolloid impression material by altering theAmount of retarder addedWater powder ratioMixing timeWater temperatureQuestion 2 of 20 3. self curing acrylics for tooth restorations are least compatible with which materialeugenolalcoholcalcium hydroxidecopal varnishQuestion 3 of 20 4. Phosphate bonded investment is made carbon free:To produce smooth castingTo prevent staining of ceramicTo prevent brittleness of alloyFor easier divesting of investmenQuestion 4 of 20 5. Which of the following statements is not true regarding creep?undertrituration tends to increase the creep rateincreasing the condensation pressure decreases the creep ratecreep gradually increases the marginal integrity of an amalgam restorationcreep is a process that happens over timeQuestion 5 of 20 6. high copper amalgams are superior to low copper amalgams because ofthey have high ratio of compressive to tensile or tensile to compressive strengthare workable at low mercury alloy ratiosthey corrode in oral cavityshows less marginal fractureQuestion 6 of 20 7. Which impression material is most difficult to remove without fracturing teeth of a stone model?PolyetherPolysulphideAddition SiliconeCondensation siliconeQuestion 7 of 20 8. exposure of a stone cast to tap water should be minimised becauseeroding of the cast will resultthe cast will be weakeneddimensional achange will occur in th ecastthe surface of the cast will acquire a chalky appearanceQuestion 8 of 20 9. Best material for casting base metal crown isSilica bondedGypsum bondedHigh refractory silica bondedPhosphate bondedQuestion 9 of 20 10. dental plaster powder and dental stone powder differ mainly inshelf lifechemical formulasolubilityparticle porosityQuestion 10 of 20 11. Disinfection of alginate impressions when immersion method is used should not exceed10m20m5m30mQuestion 11 of 20 12. role if indium in amalgam isto reduce formation of gamma 2 phaseto reduce release of mercury during amalgam polishingto reduce elease of mercury during masticationto reduce formation of gamma phaseQuestion 12 of 20 13. Bur used for smooth finishing:Diamond bur18 flute carbide burs6 fluted carbide burs12 fluted carbide bursQuestion 13 of 20 14. Not associated with corrosion products in metal alloysCarbonatesChloridesOxidesSulphidesQuestion 14 of 20 15. Lower density usually means?Low strengthLighter weightLow melting temperatureHigh strengthQuestion 15 of 20 16. An impression is taken with addition silicone. What should be done before pouring the cast?Rinse with chloroformWait for sometime before pouringMix with some flavouring agentRinse with ketoneQuestion 16 of 20 17. Which of the following is formed by spray atomization and chemical precipitation of molten goldGold foilCrystalline goldMat goldGranular goldQuestion 17 of 20 18. In orthodontic stainless steel wire which of the following is used to reduce hardness?CarbonSiliconeCobaltChromiumQuestion 18 of 20 19. Stiffness is related to?Resistance to elastic deformationDegree of elastic resistanceResistance to plastic deformationDegree of plastic resistanceQuestion 19 of 20 20. oxides of all of the following elements in noble metal alloys help in bonding to porcelain excepttinnickelironindiumQuestion 20 of 20 Loading...
