1. for a successful metal ceramic restoration both the metal and porcelain must have closely matched specific gravity compressive strength solidification shrinkage coefficient of thermal expansion 2. which zone of flame is used for melting alloys combustion zone oxidising zone central zone reducing zone 3. Which of the following is a solid solution? amalgam silver palladium gallium silver alloy cobalt chromium 4. bonding of GIC to tooth structure is brought about by metal ions hydroxyl group fine pumice carboxyl group 5. Clinical appearance of GIC is dictated by Acid content of liquid Chemical composition of cement Particle size of powder Viscosity of liquid 6. Which of the following property of amalgam is adversely affected by triturating with mechanical device Working time Gloss of final mixture Hardness of final mixture Less tarnish resistance 7. which of the following will form a peritectic alloy silver and copper silver and gold silver and palladium silver and tin 8. of the following, most kind to the pulp is polycarboxylate zinc phosphate GIC silicate cements 9. diamond particle size of 125-150 um is catagorised as fine medium extrafine coarse 10. oxides of all of the following elements in noble metal alloys help in bonding to porcelain except nickel iron tin indium 11. Non eugenol pastes contain ____ instead of eugenol: Orthoethoxy benzoic acid Zinc chloride Zinc acetate Polyethylmethacrylate 12. Which of the following is true statements regarding the polishing of amalgam? it should be done with a dry polishing powder it should be done about 10 minutes after placement it prevents tarnishing of the restoration occlusion should not be checked prior to polishing 13. dental plaster powder and dental stone powder differ mainly in chemical formula solubility particle porosity shelf life 14. Mercaptan are a component of: Polysulphide Condensation silicone Polyether Addition silicone 15. anti rust agent is 2 %potassium nitrate 4 % sodium nitrate 2 % sodium nitrite 2 % sodium nitrate 16. Etching of feldspathic ceramic: HF acid 35% Phosphoric acid HN03 HCL 17. Which of the following is a resorbable Bio- ceramic? Carbon Zirconia Calcium phosphate Alumina 18. 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? Polysulfides polyethers polyvinyl siloxanes condensation silicones 19. What is the effect of addition of an accelerator or a retarder to a gypsum cast The compressive strength decreases No relation to compressive strength The compressive strength may increase or decrease depending upon the amount of the accelerator/retarder added The compressive strength increases 20. Hardening heat treatment for gold copper alloys involves Quenching immediately after casting Heating to 350 degree C for 15-30 min followed by quenching Heating to 700 degree C for 10 min followed by quenching Quenching immediately after recrystallisation Loading … Question 1 of 20
