1. carnauba wax is added to basic paraffin wax to ensure uniformity of batches improve the smoothness in molding decrease flow at mouth temp render it resistant to cracking and flaking 2. What distinguishes a base from a cement from a cavity liner? degree of pulpal protection biocompatibility of material final application thickness degree of hardness 3. the restorative material having hardness nearest to that of enamel is silicate cement microfilled composite resin direct filling gold amalgam 4. ductility means percentage elongation the metal can be transformed into sheets increases with rise in temperature subjecting a cylindrical specimen to a compressive load 5. of the following, most kind to the pulp is zinc phosphate silicate cements GIC polycarboxylate 6. the primary oxygen scavenger in noble metal casting alloy is zinc iron copper silver 7. Principle hardener in gold alloy is Zinc Palladium Copper Silver 8. the activator for autopolymerising resin is likely to be hydroquinone benzoyl peroxide tertiary amine heat 9. the working time of a phosphate investment mix can be increases by increasing the all of the above mixing time and mixing efficiency tempperature of the mix liquid /powder ratio 10. A thin application of cavity varnish over the cut surface of a prepared tooth just prior to the cementation of a crown or a bridge with zinc phosphate cement will impede the seating of the restoration. insulate the tooth against thermal change reduce the possibility of irritation of the pulp increase the possibility of thermal sensitivity. 11. Which of the following is a solid solution? amalgam cobalt chromium gallium silver alloy silver palladium 12. Inlay wax suitable for making indirect pattern is Any of the above Type II Type III Type I 13. percentage of phosphoric acid where Dicalcium monophosphate is formed; which cannot be easily removed 25 percent 85 percent 50 percent 37 percent 14. Pyroplastic flow in dental porcelain Should optimally be high Is decreased with a low soda/potash ratio Is determined by potash form Is not an important consideration 15. Metal oxides are added to powder of porcelain for Decrease strength; act as a refractory skeleton Give color, increase strength Give color , decrease strength Increased strength; act as a refractory skeleton 16. Which of the following investment exhibit green shrinkage Phosphate bonded Silica bonded All of the above Gypsum bonded 17. Purpose of reservior is to Help in removal of wax Gives smooth polished surface Prevent removal of molten metal Prevent localised shrinkage porosity 18. role if indium in amalgam is to reduce release of mercury during amalgam polishing to reduce elease of mercury during mastication to reduce formation of gamma 2 phase to reduce formation of gamma phase 19. Bond strength required to counteract the effect of polymerization shrinkage in composite resins: 17 MPa 7 MPa 56 MPa 21 MPa 20. Constituent of bioactive glass: Calcium carbonate Alumina Zirconia Silica Loading … Question 1 of 20
