1. in processing an acrylic denture in a water bath a proper heating cycle is desired because of the possibility ofwarpageshrinkage of the denturevolumetric expansion of the denture causing an open biteporosity due to boiling of the monomerQuestion 1 of 20 2. type IV gold casting alloys are used for fabricatinginlays3/4 crownsremovable partial denture frameworksshort span bridgesQuestion 2 of 20 3. Brush heap structure is seen in:PolyethersImpression compoundAddition siliconesAlginateQuestion 3 of 20 4. In orthodontic stainless steel wire which of the following is used to reduce hardness?CobaltChromiumCarbonSiliconeQuestion 4 of 20 5. dental impression compound is characterised by having across linkage reaction upon heatingspecific melting pointrelatively low thermal conductivitycrystalline atomic structureQuestion 5 of 20 6. role if indium in amalgam isto reduce release of mercury during amalgam polishingto reduce formation of gamma 2 phaseto reduce elease of mercury during masticationto reduce formation of gamma phaseQuestion 6 of 20 7. the strength of gypsum bonded investment is dependednt uponsilica contentgypsum contentcopper contentcarbon contentQuestion 7 of 20 8. The dentist can best control the setting time of irreversible hydrocolloid impression material by altering theWater temperatureMixing timeWater powder ratioAmount of retarder addedQuestion 8 of 20 9. Bonding of porcelain veneer done by:PolycarboxylateRM-GICGICResin cementQuestion 9 of 20 10. gypsum investments disintegrates at200 degree C700 degree C195 degree C140 degree CQuestion 10 of 20 11. Enamel resin bond used forConsist of a highly filled liquid acrylic monomer mixture placed onto acid etched enamelImprove mechanical bond of resinIt has no role in preventing micro leakageCan be used for enamel as well as DentineQuestion 11 of 20 12. Hardening heat treatment for gold copper alloys involvesQuenching immediately after castingHeating to 700 degree C for 10 min followed by quenchingQuenching immediately after recrystallisationHeating to 350 degree C for 15-30 min followed by quenchingQuestion 12 of 20 13. Which of the following is a solid solution?gallium silver alloyamalgamcobalt chromiumsilver palladiumQuestion 13 of 20 14. Porcelain is strongest when in a state oftorsiontensioncompressionneutralityQuestion 14 of 20 15. for zinc oxide eugenol all of the following are true exceptolive oil is used as plasticizerresin decreses the brittleness of set cementaddition of methyl methacrylate resin increases strengthaddition of EBA in concentration of 37-50 percent increases strengthQuestion 15 of 20 16. Principle purpose of annealing isTo make the gold cohesiveTo remove the absorbed gasTo change metal metallographicallyTo eliminate strain hardeningQuestion 16 of 20 17. all of the following processes can be performed at room temp exceptcold workingstrain hardeningforgingwork hardeningQuestion 17 of 20 18. Primer which etches and primes dentin is known as:Self etch adhesiveTwo step systemAuto etch adhesiveSelf etching primerQuestion 18 of 20 19. main advantage of zinc phosphate over GIC ismore biocompatibilityincreased tensile strengthincrease modulus of elasticityincrease compressive strengthQuestion 19 of 20 20. Tg of impression compound is100 degree c65 degree c43.5 degree c39 degree cQuestion 20 of 20 Loading...
