0% 1 Dental Materials Quiz 1 1 / 50 Which of the following cements is most irritant to pulpal tissues ? Glass ionomer Zinc phosphate Silicate Polycarboxylate 2 / 50 Which one of the following is the result of applying a load to a wire below its modulus of elasticity on a load deflection diagram ? permanent deformation Fracture of the wire Increase in stiffness Spring back 3 / 50 Which component of zinc oxide-eugenol cement gives its strength ? Rosin Zinc acetate Zinc oxide Oil of cloves 4 / 50 The dual cure cements should not be used with light transmitting prostheses thicker than____________? 2.5 mm mm mm 1.5 mm 5 / 50 Amalgam achieves 70% of the strength by____________? 8 hours 16 hours hours 4 hours 6 / 50 Which of the following is not true about elastomeric impression ? Single mix material have higher viscosity Shear thinning is related to viscosity of non phase impression material Putty ? wash technique of impression reduces dimensional change of setting Improper mixing of material can cause permanent deformation of impression 7 / 50 The latest method of curing denture base resins______________? Visible light Chemicals Lasers Heat 8 / 50 Cross linking in denture base resin is contributed by_____________? Glycol dimetharylate Methyl methacrylate N-para toluidine Benzoyl peroxide 9 / 50 Materials which has high compressive strength and low tensile strength is classified with property of________________? Malleability Brittleness Ductility Resilient 10 / 50 Which of the following cements is most biocompatible with pulp ? Zinc phosphate cement Zinc oxide eugenol cement GIC Copper cement 11 / 50 The effects associated with cold working can be eliminated by a heat treatment called______________? Annealing heat treatment Solution heat treatment Homogenization heat treatment Age hardening heat treatment 12 / 50 Which of the following properties of dental materials is time dependent_______________? Creep Elastic limit Ultimate strength Resillience 13 / 50 The main purpose of adding metallic oxides in ceramic is________________? Opacity None of the above Transparency Colour matching 14 / 50 Best material for duplicating cast is_______________? Agar-agar Zinc oxide eugenol Plaster of paris Alginate 15 / 50 Stainless steel is used mostly in dentistry_________________? To construct clasps for partial dentures To replace internal gold restorations In orthodontic wires To strength amalgam 16 / 50 Light cure system, side effect is____________? Conjunctivitis Retinal damage Cataract Iritis 17 / 50 Quartz is added to gypsum bonded investment to______________? Counter balance contraction of gypsum during heating Increase the strength aid in hygroscopic expansion Increase the shelf life of investment 18 / 50 A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________? Injecting technique Immersion technique Laminate technique Tempering technique 19 / 50 Pitting of direct filling old restoration usually results from_________________? Poor finished preparation Using small condenser point Improper stepping of condenser point Using contaminated gold foil 20 / 50 When solid gets wet completely contact angle is______________? 0 ? 90? 0? >90? 90? 21 / 50 Advantage of zinc phosphate over GIC is______________? High modulus of elasticity Diametral strength Tensile strength High compressive strength 22 / 50 Crocus cloth is________________? Emery Pumice Garnet Rouge 23 / 50 Ideal requirement of metal ceramic casting____________? Bonding between ceramic and alloy Matching of coefficients of thermal expansion of ceramics and alloy Low fusing ceramic and high fusing alloys All of the above 24 / 50 Quartz tungsten light cure device minimum output of energy should not be less than_____________? 300 mw/sm2 400 mw/cm2 450 mw/cm2 350 mw/cm2 25 / 50 Which of the following is correct regarding chemical setting of condensation silicone_______________? Polymerization occurs with repeated elimination of small molecules Condensation does not occur at all By condensation of repeated molecules of monomers Polymerization occurs with elimination of single byproduct 26 / 50 Which is true regarding lathe cut silver alloy_______________? Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloy Achieves lowest compressive strength at 1 hr. Has low creep Requires least amount of mercury 27 / 50 Increase in the residual mercury in silver amalgam filling can_____________? Increase the strength Cause fracture of the filling Decrease condensation pressure Tarnish and corrosion 28 / 50 Rapid removal of rubber impression with a single firm motion results in____________________? Improved adhesion of the impression to the tray Reduced dimensional instability Minimal permanent deformation Reduced contamination by saliva 29 / 50 Mercury is toxic because it_____________? Inhibits hemoglobin synthesis, producing anemia Binds to sulfhydryl groups Complexes with hemoglobinto form methemoglobin Inhibits anaerobic glycolysis 30 / 50 Which of the following is most important in strength ZOE_____________? Temperature of mixing stab Addition of few drops of water Liquid powder ratio Speed of mixing 31 / 50 Finer particle size of silica______________? Greater the hygroscopic expansion No setting expansion Slower the hygroscopic expansion Normal setting expansion 32 / 50 pH of fully set zinc phosphate______________? 8-Jul 5-Apr 4-Mar 7-Jun 33 / 50 The cavity varnish applied reduces post operative sensitivity in amalgam restoration by____________? By preventing penetration of corrosion products into the dentinal tubules By altering the chemical composition of restoration materials Decreasing conduction of heat to pulp Minimize marginal leakage around restoration 34 / 50 Which of the following do polycarboxylate and GIC have in common ? Ion leachable glass Polyacrylic acid Polysiloxane Phosphoric acid 35 / 50 During soldering, the solidus temperature of the filler material should be_____________? Equal to the substrate material Lesser than the substrate material Temperature not relevant Greater than the substrate material 36 / 50 The impression with the least dimensional change upon disinfection is_______________? Agar-agar Polysulphide Addition poly silicone Polyether 37 / 50 Which of the following is used as surface hardener in Impression material ? 4% Potassium sulfate 2% sodium sulfate 2% Potassium sulfate 0.2% Potassium sulfate 38 / 50 Microstructure of cobalt chromium alloy in cast condition is______________? Fibrous Inhomogenous amorphous Homogeneous 39 / 50 Which of the following is an example of a composite material ? Colloidal silica Gold alloy A filled resin Wax 40 / 50 The solvent flux used for base metal soldering is_______________? Boric acid Borax Fluoride Rouge 41 / 50 Maxwell ? Voigt Model is to determine________________? Plastic Behaviour All of the above Elastic Behaviour Viscoelastic Behaviour 42 / 50 Which of the following impression material is rigid ? Polysulphide rubber Zinc oxide-eugenol Reversible hydrocolloid Alginate 43 / 50 KHN of enamel is close to______________? Amalgam Pure gold Prcelain Composite 44 / 50 Gap between true end of casting ring and wax pattern should be______________? ? inch ? inch one inch 3/8 inch 45 / 50 The type of spatula used to mix composite is________________? Plastic Iron Stainless steel None of the above 46 / 50 The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ? Recrystallisation stage All of the above Recovery stage Grain growth stage 47 / 50 A material which partially transmits light & partially scatters it________________? Reflector Translucent Opaque Transparent 48 / 50 Alginates are_____________? Sol Hydrocolloid Colloid Gel 49 / 50 Which of the following is correct glass transition temperature of Impression compound ? 65?C 39?C 100?C 43.5?C 50 / 50 Which of the following absorbs maximum amount of water ? Light cure activated Macrofilled resin Hybrid Microfilled resin Provide Your Information Your score is The average score is 16% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp Dental Materials Quiz 2Next
