1. The main component of gypsum bonded investment which provides thermal expansion to compensate for alloy solidification shrinkage is Binder Modifiers like magnesium oxide and sodium chloride None of the above Refractory filler 2. Function of molybdenum in base metal alloys? Increase CTE Decrease corrosion resistance Decreases strength Increases strength 3. anti rust agent is 2 % sodium nitrite 2 % sodium nitrate 2 %potassium nitrate 4 % sodium nitrate 4. Which property of composites is most affected by the size and number of fillers: Thermal contraction Polymerization shrinkage Water sorption Thermal expansion 5. which of the following will form a peritectic alloy silver and copper silver and palladium silver and gold silver and tin 6. Principle hardener in gold alloy is Copper Zinc Palladium Silver 7. The relative amount of lightness or darkness in a color is referred to as: hue chroma intensity value 8. Which material is sensitive to Sulfur contamination from latex gloves: Agar Addition silicone Polysulfide Polyether 9. Type I GIC is Lining Resin modified Restorative Luting 10. Stress is: Force applied per unit area An internal force opposing an applied load Force applied perpendicular to the surface A deformation resulting from an applied load 11. which of the following is not a nobel metal gold silver ruthenium osmium 12. the porcelain constituent that fuses at firing temperature and forms a matrix is feldspar quartz kaolin aluminium oxide 13. the function of monomer added to the heat curing resin polymer is primarily to provide adhesion of the resin base to the teeth start the polymerisation reaction reduce the porosity and increase the strength of the appliance produce a plastic mass that can be packed into the mold 14. Stain removing commercial denture cleanser usually contain Potassium perborate Sodium hypochlorite Soda ash Sodium perborate 15. The phenomenom where porcelain appears different under varying light conditions is Regractive optics Opacification Transmittance Metamerism 16. the working time of a phosphate investment mix can be increases by increasing the all of the above liquid /powder ratio tempperature of the mix mixing time and mixing efficiency 17. Material added in In-Ceram: Alumina Lucite Feldspar Kaolin 18. A very active metal which is gas at room temperature is Mercury Gallium Hydrogen Oxygen 19. Temp at which tertiary amine activates benzoyl peroxide release free radicals 50?C 60?C 37?C 25? C 20. All of the following statements are true regarding glass ionomer restorations,except the best surface finish for a glass ionomer restoration is that obtained against a surface matrix glass ionomer adheres to mineralized tooth tissue glass ionomers are somewhat esthetic and polish much better than composites glass ionomer is often the ideal material of choice for restoring root surface caries in patients with high caries activity Loading … Question 1 of 20
