1. When using which impression material can you delay pouring up of the model for up to one week? reversible hydrocolloid poly vinyl siloxane Polyether polysulfide 2. When electroplating an impression with copper the cathode is A copper paste or rod The impression being electroplated Copper sulphate Distilled water 3. With which of the following impression materials is it advisable to wait 20 to 30 minutes before pouring of models for stress relaxation to occur? condensation silicones Polysulfides polyvinyl siloxanes polyethers 4. Principle purpose of annealing is To make the gold cohesive To eliminate strain hardening To change metal metallographically To remove the absorbed gas 5. Modulus of elasticity/tensile strength of brittle materials is measured by Cold bend test 3-point bend test Diametrical compresssion test Charpy test 6. the antiflux used for gold solders is titanium silicon cryolite graphite 7. which cement has the highest modulus of elasticity zinc polyreinforced ZOE glass ionomer cement zinc polycaroxylate zinc phosphate 8. The relative amount of lightness or darkness in a color is referred to as: chroma value intensity hue 9. Dental porcelain is manufactured by a process known as Devitrification Fritting Creaming and bisque bake Crystallisation 10. an amalgam is an alloy of two or more metals one of whose consituent is silver of silver and tin one of those whose constituent is mercury 11. for best results when using an elastic impression material the prepared tooth should be covered thinly with a waer soluble lubricant free of surface moisture very dry covered with a surface tension reducing agent or air dried 12. Which of the following statements is not true regarding glass ionomer cements? release fluoride high solubility after initial setting good thermal insulator thermal expansion similar to tooth 13. Casting shrinkage in a type 2 gypsum investment is counteracted by: Increasing the thickness of casting ring Thermal expansion of the investment Hygroscopic setting expansion of investment Setting expansion of investment 14. Stiffness is related to? Degree of elastic resistance Resistance to plastic deformation Degree of plastic resistance Resistance to elastic deformation 15. the difference between heat cured and cold cured acrylic resin is least significant with respect to the property of internal porosity color stability transverse strength hardness 16. titanium casting is done in specifically fabricated aluminium vanadium crucibles using cad-cam technique under vaccum in argon atmosphere under air pressure in nitrogen atmosphere 17. Which of the following is true statements regarding the polishing of amalgam? it prevents tarnishing of the restoration it should be done about 10 minutes after placement it should be done with a dry polishing powder occlusion should not be checked prior to polishing 18. What is the effect of addition of an accelerator or a retarder to a gypsum cast No relation to compressive strength The compressive strength decreases The compressive strength may increase or decrease depending upon the amount of the accelerator/retarder added The compressive strength increases 19. Constituent of bioactive glass: Silica Zirconia Alumina Calcium carbonate 20. Which of the following cements provide maximum resistance to decalcification while placing bands on molar Silicate Zinc phosphate GIC Polycarboxylate Loading … Question 1 of 20
