1. role of flux in soldering is to preheat restrict the flow of solder removes oxide to melt the solder 2. of the following, most kind to the pulp is polycarboxylate GIC silicate cements zinc phosphate 3. The chamelon effect has been portrayed by which of the ceramic restorations In ceram Cerestore Cerec Dicor 4. When Alginate is mixed with tap water having high calcium sulfate and magnesium, what happens Permanent deformation of alginate Weakened stone dies Acceleration of setting reaction Retardation of setting reaction 5. for a successful metal ceramic restoration both the metal and porcelain must have closely matched coefficient of thermal expansion solidification shrinkage specific gravity compressive strength 6. Material added in In-Ceram: Alumina Feldspar Kaolin Lucite 7. Cerrobend alloy is low fusing material for removing memory patterns high fusing metal for removing memory patterns high fusing metal for positioning or shielding stent low fusing metal for positioning or shielding stent 8. Cavity Varnish is used with: Compomer Glass Ionomer Composite Amalgam 9. Which material is sensitive to Sulfur contamination from latex gloves: Polyether Polysulfide Agar Addition silicone 10. role if indium in amalgam is to reduce formation of gamma phase to reduce elease of mercury during mastication to reduce formation of gamma 2 phase to reduce release of mercury during amalgam polishing 11. metal ceramic restorations may fail due to fracture of the ceramic material .this can be best avoided if the ceramic material is at least 1.5 mm thick the casting is designed to reduce stress concentration in the ceramic material the metal is not over 0.5 mm thick occlusal forces are minimal 12. an amalgam is an alloy one of those whose constituent is mercury one of whose consituent is silver of silver and tin of two or more metals 13. nickel is added to wrought gold alloys as balance of color age hardner strengthener scavenger 14. Metal oxides are added to powder of porcelain for Give color , decrease strength Decrease strength; act as a refractory skeleton Give color, increase strength Increased strength; act as a refractory skeleton 15. test used to check setting time of impression material is vicat test cold bend test vickers test rockwell test 16. Pinhole porosities are related to Sprue casting dissociation Entrapement of gas during solidification Distortion of wax pattern Casting investment junction 17. the working time of a phosphate investment mix can be increases by increasing the mixing time and mixing efficiency tempperature of the mix liquid /powder ratio all of the above 18. ductility means the metal can be transformed into sheets percentage elongation increases with rise in temperature subjecting a cylindrical specimen to a compressive load 19. The ratio of transverse contraction strain to longitudinal extension strain in the direction of stretching force is known as Tensile stress Shear stress Compressive stress Poissons ratio 20. Which impression material is radio opaque: Condensation silicone Poly ether Addition silicone Polysulfide Loading … Question 1 of 20
