1. Maximum flow of Type I inlay wax at 45 degrees: 3percent 70percent 10percent 2 percent 2. Addition of fillers in composite resins: Decreases polymerization shrinkage Increases wettability Decreases wear resistance Reduces strength 3. the union of metal to porcelain fused restoration is by cobalt and porcelain tin and indium oxides mechanically rough surface nickel and orcelain 4. titanium casting is done under air pressure in nitrogen atmosphere in specifically fabricated aluminium vanadium crucibles using cad-cam technique under vaccum in argon atmosphere 5. diamond particle size of 125-150 um is catagorised as coarse medium fine extrafine 6. Casting shrinkage in a type 2 gypsum investment is counteracted by: Setting expansion of investment Increasing the thickness of casting ring Thermal expansion of the investment Hygroscopic setting expansion of investment 7. Mercaptan are a component of: Polysulphide Condensation silicone Addition silicone Polyether 8. Best cementing medium for self retained all ceramic crown is Dual cure resin Chemical cure resin RMGIC GIC 9. Shade matching is done in what light condition: Day light at 6000K Fluorescent light at 6500K Incandescent light bulb at 2500K Colour corrected fluorescent light at 5500K 10. Which of the following is true statements regarding the polishing of amalgam? occlusion should not be checked prior to polishing it prevents tarnishing of the restoration it should be done with a dry polishing powder it should be done about 10 minutes after placement 11. Microwave polymerisation for Acrylic dentures uses: Heat Conduction Heat Convection Radiation Magnetic Field 12. the effectiveness of condensation and prevention of porcelain shrinkage is determined by speed of icrease of furnace heat thickness of platinum mix use of powder containing particles that are of same size shape and size of particles 13. Gutta percha, stearic acid and shellac are added to impression compound to: To prevent leaching out ofthermolabile components Improve workability & plasticity To increase stifthess and hardness of the compound To improve softness at melting temperature 14. Loss of colour stability in self polymerizing resins is due to degradation of: Hydroquinone Tertiary amine Benzoyl peroxide initiator Polymethyl methacrylate 15. porcelain are made opaque by the addition of oxides of nickel and iridium boron and magnesium titanium and tin iron and aluminium 16. What chemical is added to prevent polymerization of polymethylmethacrylate during storage: Benzoyl peroxide Hydroquinone Camphorquinone Tertiary amines 17. high copper amalgams are superior to low copper amalgams because of shows less marginal fracture they have high ratio of compressive to tensile or tensile to compressive strength they corrode in oral cavity are workable at low mercury alloy ratios 18. most common reason for incomplete casting when using a centrifugal casting machine is narrow sprue increased porosity of the investment large reservoir hollow space 19. Following is added to zinc polycarboxylate to improve its manageability: Aluminium oxide Magnesium oxide Strontium fluoride Stannous fluoride 20. the process of driving off the water of crystallisation of gypsum to manufacture powders of plaster and stone is called fusing sintering crazing calcining Loading … Question 1 of 20
