Biomaterial Test 0% 5 votes, 5 avg 0 You will have 60 minutes to complete all the questions. After the timer reaches 60 minutes, the exam will end and be saved automatically. Good luck! *Fingers crossed* The timer has been reached. The exam has now been terminated and saved. Biomaterial Test 1 / 60 Commonly used coloring agent in impression plaster is 😕 a. Alizarin red b. Indigo dye c. Metallic oxide d. Congo red 2 / 60 Binder in the phosphate investment is 😕 a. Manganese dioxide b. Magnesium oxide and monoammonium phosphate c. Phosphoric acid d. Cristobalite 3 / 60 Stiffness of the material with passage of time is maximum in 😕 a. Addition silicones b. Polysulfides c. Polyether d. Condensation silicones 4 / 60 Which of the following components acts as a refractory material in porcelain ? a. Feldspar b. Silica c. Potash d. Kaolin 5 / 60 Wet porcelain is condensed properly before firing to enhance all the properties except : ? a. Reduce porosity b. increase strength c. Reduce brittleness d. Reduce firing shrinkage 6 / 60 All are properties of waxes except 😕 a. Plastic deformation b. Creep c. Solidification shrinkage d. Flow 7 / 60 An anterior fixed partial denture could have facings constructed of which of the following materials ? a. Gold alloy b. Amalgam c. Composite resin d. Metal 8 / 60 The temperature at which a solid changes to liquid is known as its 😕 a. Vapor temperature b. Temperature of specificity c. Fusion temperature d. Heat temperature 9 / 60 Which of these statements are correct in terms of preparing a correctly triturated mass of amalgam ? a. A correctly triturated mass is a smooth homogeneous, and dull. b. An overmixed mass is removed readily from the capsule but is soupy in appearance. c. Dental amalgam is a mixture of silver alloys and mercury. d. An undertriturated mass is crumbly and dull. 10 / 60 Crystalline materials have 😕 a. Well-defined melting b. No well-defined melting c. No space lattice d. Less stable space lattice 11 / 60 The main use of zinc oxide eugenol cement is 😕 a. Permanent restoration b. Base c. Temporary restoration d. Indirect pulp capping agent 12 / 60 The byproduct in condensation silicones is 😕 a. Propyl alcohol b. Methyl alcohol c. Butyl alcohol d. Ethyl alcohol 13 / 60 The most commonly employed alloy combination for use in implants is 😕 a. Titanium-aluminum-vanadium alloy b. Platinum-aluminum-vanadium alloy c. Titanium-molybdenum-vanadium alloy d. Titanium-platinum-aluminum alloy 14 / 60 Sulfur contamination from natural latex gloves inhibits the setting of 😕 a. Polyether b. Polyvinyl siloxane c. Zinc oxide eugenol impression paste d. Alginate 15 / 60 Which statements are true for bonding of amalgam to tooth structure ? a. The use of amalgam bonding reduces marginal leakage of amalgam restorations. b. The use of amalgam bonding restores the strength of the clinical crown to its original condition. c. Shear bond strength using amalgam bonding to teeth in clinically proven to be as high as that for bonding composites to teeth. d. The most effective bonding agents contain copalite. 16 / 60 Oil of clove is sometimes used in preference to eugenal in ZOE paste because : a. Reduces burning sensation of paste b. It increases mixing property of paste and therefore improves impression recorded c. Has a better reaction with zinc oxide d. To increase setting time 17 / 60 An anterior fixed partial denture could have facings constructed of which of the following materials ? a. Gold alloy b. Amalgam c. Silver alloys d. Ceramic 18 / 60 Which of the following is called periphery wax ? a. Beading wax b. Bite registration wax c. Utility wax d. Sticky wax 19 / 60 The product that is formed on the surface of the amalgam restoration and frequently result in discoloration is 😕 a. Gamma I Phase b. Sulphide c. Gamma II Phase d. Oxide 20 / 60 Potato starch is contained in which impression material ? a. Impression plaster b. Potassium sulfate c. Agar agar d. Impression compound 21 / 60 Which of the following polymer systems are used for the organic matrix in composites ? a. Poly (methyl methacrylate) b. Pheyl methacrylate c. Polystyrene d. Bisphenol A-glycidyl methacrylate (Bis-GMA) 22 / 60 Following are the functions of impression compound except 😕 a. To make special tray for final impression b. To record mucostatic impressions c. To make impression of edentulous ridge d. To make individual die impression with copper band 23 / 60 Which of the following phases in dental amalgam restoration is most prone to electrochemical properties ? a. Sn-Hg b. Ag-Sn c. Cu-Sn d. Ag-Hg 24 / 60 For each property, list the amalgam type (irregular low-copper, admixed high-copper, and spherical high-copper ) that has the highest value?. a. Tensile strength spherical high-copper b. 1-hour compressive strength spherical high-copper c. Creep irregular low-copper d. Creep irregular high-copper 25 / 60 Commonly used viscosity controller in composites is 😕 a. Methyl methacrylate b. TEG-DMA c. Polyurethanes d. Bis-GAM 26 / 60 Working time of denture resin should be at least 😕 a. 10 minutes b. 20 minutes c. 5 minutes d. 15 minutes 27 / 60 Strain that occurs when the material is stressed to its proportional limit is called 😕 a. Resilience b. Toughness c. Flexibility d. Modulus of elasticity 28 / 60 Which of the following composite is recommended for non stress bearing anterior restoration ? a. Hybrid composites b. Microfilled composites c. Small particles d. Conventional composites 29 / 60 The type of stress to which dental amalgam is more resistant to 😕 a. Impact stress b. Compressive stress c. Tensile stress d. Shear stress 30 / 60 The main advantage of composites compared to silicates cement is 😕 a. Practically insoluble in oral fluids b. Coefficient of thermal expansion close to tooth structure c. Color matching with the tooth structure is excellent d. High modulus of resilience 31 / 60 The impression material which is routinely used in auto mixing devicee system is 😕 a. Polyether b. Polysulfied c. Polyvinyl siloxane d. Condensation silicone 32 / 60 Which of the following waxes used to align of castings before soldering ? a. Base plate wax b. Carding wax c. Utility wax d. Sticky wax 33 / 60 Color stability of cold-cured resins is inferior to that of heat cured resins due to 😕 a. Variation in the molecular weight of the resin (low mol wt) b. Decreased polymerization of the resin c. Increased solubility of the resin d. Subsequent oxidation of the tertiary amine 34 / 60 Porcelain-bonded to metal is stronger when fired 😕 a. Several times in air b. Under low temperature c. Under compression d. After metal is tempered 35 / 60 The desirable quality of porcelain is 😕 a. Requirement of color b. Translucency c. Thermal expansion d. Toughness without brittleness 36 / 60 Nickel sensitivity in the general population is 😕 a. 3% for men b. 11% for women c. 1% in the overall population d. 3% for women 37 / 60 Excess composite from the labial surfaces can be removed by using 😕 a. Diamond burs at low to medium speed b. Diamond burs at high speed c. Carbide burs at high speed d. Carbide burs at low to medium speed 38 / 60 The reason zinc oxide eugenol cement is used as a temporary restoration 😕 a. It has poor tensile strength b. It has an obtudant effect c. It does not form reparative dentin d. It does not have anticariogenic activity 39 / 60 Which of the following waxes is obtained from distillation of petroleum ? a. Carnauba and candellia b. Spermitic and bees wax c. Montan and Japan coco d. Paraffin and microcrystalline wax 40 / 60 Cavity varnish should not be applied when the following is used as a filling material 😕 a. Amalgam b. Direct resin-filling material c. Zinc phosphate d. Silicate 41 / 60 The appropriate proportion of polymer to monomer component of dental resin by volume is generally 😕 a. 2:1 b. 3:1 c. 1:2 d. 1:3 42 / 60 Greening effect of porcelain is due to 😕 a. Palladium b. Silver c. Golde d. Platinum 43 / 60 All of the following are properties of Co-Cr-Ni wires except 😕 a. They can be heat treated b. They have excellent tarnish and corrosion resistance c. Their hardness is comparable to stainless steel d. They cannot be soldered or welded 44 / 60 Which of the following metals currently are used in dental alloys ? a. Waxe b. Glass ionomer c. Gold d. Ceramic 45 / 60 If the light cure resin is curd in increments, it helps in 😕 a. Compensating polymerization shrinkage b. Achieving complete polymerization c. Providing strength to the restoration d. Saving the application of bonding agent 46 / 60 The purpose of burnishing the amalgam after condensation is to 😕 a. To reduce discoloration b. To reduce gamma II particule c. Reduce surface microporosities d. To prevent recurrent carries 47 / 60 The function of gum dammar in inlay wax is 😕 a. No smoothness of pattern b. To improve smoothness of pattern c. Less strength to wax d. No resistance to carving 48 / 60 A glaze is placed over the finished composite restoration to 😕 a. To reduce surface porosities b. Create a rough surface that is less receptive to extrinsic stain and plaque retention c. To change the shade d. No provide a better peripheral seal 49 / 60 The main ingredient of casting waxes is 😕 a. Carnauba wax b. Paraffin wax c. Candellila wax d. Gum dammar 50 / 60 Spot out incorrect statement regarding zinc in dentistry 😕 a. It is low in strength b. Pure zinc has no application in dentistry c. It is relatively soft and ductile d. It does not oxidize 51 / 60 Dental personnel can do which one of the following to limit their exposure to mercury ? a. Sterilize amalgam scrap b. Avoid polishing amalgams c. Vacuum up a spill immediately d. Avoid touching freshly mixed amalgam 52 / 60 In deep caities, the resin which remains unpolymerized can cause 😕 a. Pulp inflammation b. Porosity in restoration c. Secondary caries d. Sagging of restoration 53 / 60 Dental porcelains are manufactured by a process termed as 😕 a. Sintering b. Fusing c. Vulcanizing d. Fritting 54 / 60 Which one of the following is not a criterion for a failed high-copper dental amalgam restorations ? a. Marginal ditching along occlusal margins b. Creep of the restoration out of the cavity preparation in proximal areas c. Micrographs of alloys particles. d. Wear facets along the occlusal contach areas 55 / 60 Main disadvantage of laminate technique of making impression is : ? a. Bond between agar and alginate is not very strong b. Cost factor is high c. Maximum details are not produced d. Difficult to manipulate 56 / 60 Resistance of a liquid to motion is called 😕 a. Viscosity b. Springiness c. Diffusion d. Creep 57 / 60 A portion of a posterior tooth that is subject to high biting forces would likely be restored with which of the following ? a. Glass ionomer b. Acrylic resin c. Amalgam d. Composite resin 58 / 60 Which of the following statements about adhesion of composite restorations to tooth structure are true ? a. Most bonding agent bond more effectively to a dry tooth surface. b. The bonding agent forms a hybrid layer with enamel. c. Bonding is achieved to enamel by application of an acid etchant followed by application of a bonding agent and then the composites resin. d. The bonding agent forms a micromechanical bond with enamel but a chemical bond with dentin. 59 / 60 Porcelain denture teeth 😕 a. Are easy to grind and polish b. Have decreased abrasion resistance than dentin c. Are more resistant of abrasion than gold d. Have higher coefficient of thermal expansion than resin teeth 60 / 60 Which of the following base is contraindicated for composites ? a. Glass ionomer cement b. Calcium hydroxide c. Zinc phosphate d. Zinc oxide eugenol Your score isThe average score is 0% Facebook 0% Restart quiz Any comments? Send feedback
