1. of the following, most kind to the pulp is GIC polycarboxylate zinc phosphate silicate cements 2. Low-fusing porcelain is usually used for the manufacture of: all of the above metal-ceramic crowns all ceramic crowns denture teeth 3. Which of the following investment exhibit green shrinkage Phosphate bonded Gypsum bonded All of the above Silica bonded 4. What is the effect of addition of an accelerator or a retarder to a gypsum cast The compressive strength increases The compressive strength decreases The compressive strength may increase or decrease depending upon the amount of the accelerator/retarder added No relation to compressive strength 5. Inlay wax suitable for making indirect pattern is Type III Type II Type I Any of the above 6. condensation shrinkage during porcelain firing is determined by rate of firing type of investment used uniform distriution of particle size size and shape of particle 7. Transformation toughening of zirconia occurs due to change in phase from: Tetragonal to monoclinic Monoclinic to tetragonal Austenitic to martensiti Cubic to tetragonal 8. Pyroplastic flow in dental porcelain Should optimally be high Is determined by potash form Is not an important consideration Is decreased with a low soda/potash ratio 9. Fluoride flux used in soldering works by Preventing flow of solder to other areas Forms a protective film during soldering Weakens the solder joint Prevents formation of chromium oxide or dissolves already formed chromium oxide 10. Type I GIC is Luting Resin modified Lining Restorative 11. in size the largest porosities in a casting are of which type gas inclusion pin hole microporosity suck back 12. When electroplating an impression with copper the cathode is The impression being electroplated Distilled water A copper paste or rod Copper sulphate 13. One disadvantage of dental porcelain restorations is: poor esthetics expansion radioactivity brittleness 14. A very active metal which is gas at room temperature is Mercury Gallium Hydrogen Oxygen 15. within practical limits when the water/powder ratio is increased beyond the recommended amount in mixing plaster the all of the above setting expansion is decreased compressive strength is decreased setting time is increased 16. What chemical is added to prevent polymerization of polymethylmethacrylate during storage: Benzoyl peroxide Camphorquinone Tertiary amines Hydroquinone 17. a cermet is a combination of feldspar and quartz conventional and aluminous ceramic powders the powders of polycarboxylate and composite resin cements silver amalgam powder and glass ionomer powder 18. role if indium in amalgam is to reduce formation of gamma 2 phase to reduce elease of mercury during mastication to reduce formation of gamma phase to reduce release of mercury during amalgam polishing 19. test used to check setting time of impression material is rockwell test vicat test cold bend test vickers test 20. mercury disposal is done by safe collection and reuse treatment with acid deep burial controlled combustion Loading … Question 1 of 20
