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1) A material behaves in certain ways above and below the proportional limit on a stress strin curve, which of the following is correct______________? a. Above the proportional limit a material function in a plastic manner, while below the proportional limit it behaves as an elastic b. Above the proportional limit a material functions in an elastic manner, while below the proportional limit it behaves as an plastic c. Either A or B d. Neither A or B
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2) Which of the following is correct________________? a. Type I and Type II gold can be heat treated and annealed b. Type III and Type IV gold can be heat treated and annealed c. Type I and IV gold can be heat treated and annealed d. All the type of gold can be heat treated and annealed
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3) Which of the following is present in the powder of the acrylic resin______________? a. Methyl methacrylate b. Benzoyl peroxide c. Hydroquinone d. D-methyl paratolouidine
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4) Boiling point of methyl methacrylate________________? a. B.P of water b. < B.P of water c. Equal of BP of water d. Is at normal room temperature
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5) The main advantage of composites over unfilled direct filling resin is their_____________? a. Higher solubility in saliva b. Lower modulus of elasticity c. Esthetic excellence d. Lower thermal co-efficient of expansion
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6) Composite has_______________? a. Resin b. Filler c. Resin & Filler d. None
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7) Acrylic resins are used for______________? a. Anterior restorations b. Temporary bridges c. Denture base d. All of the above
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8) To prevent porosity in self-cure acrylic resin, curing should be carried in______________? a. Cold water b. Hot water c. Under tap water d. Under vacuum pressure
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9) Porosity present in a acrylic denture is usually the result of______________? a. A prolonged curing cycle b. Lack of sufficient pressure applied to flask c. Insufficient acrylic resin monomer d. Prolonged bench cooling after curing
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10) Cross linking in denture base resin is contributed by_____________? a. Glycol dimetharylate b. Benzoyl peroxide c. N-para toluidine d. Methyl methacrylate
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11) Hydroquinone is added to methyl methacrylate monomer_________________? a. To prevent polymerization during storage b. To initiate release of free radicalls c. To enable polymerization reaction at room temperature d. All of the above
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12) Which of the following inhibitor accelerator system uses light activation composite ? a. Diketone-amine b. Organic acid-metal oxide c. Organic acid-peroxide d. Peroxide-amine
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13) Which of the following is an example of a composite material ? a. A filled resin b. Colloidal silica c. Gold alloy d. Wax
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14) In heat cure denture base acrylic resins the monomer is___________? a. Methacrylate b. Ethylmethacrylate c. Methyl ethyl methacrylate d. Polymethylmethacrylate
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15) Light cure system, side effect is____________? a. Iritis b. Cataract c. Conjunctivitis d. Retinal damage
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16) Bonding of composite resins to tooth structure is by________________? a. Covalent bond b. Ionic bond c. Mechanical d. Vanderval forces
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17) The type of spatula used to mix composite is________________? a. Plastic b. Stainless steel c. Iron d. None of the above
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18) Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ? a. Excessive expansion b. Low impact strength c. Excessive shrinkage d. Excessive brittleness
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19) Benzoin methyl ether in a polymer indicates that they may be cured in the presence of________________? a. UV light b. Visible light c. Infrared light d. Diketone
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20) Porosity of denture base is due to_______________? a. Packing at dough stage b. Curing at 160°F for 9 hrs c. Inadequate pressure d. All of the above
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21) The imperfection seen on the lingual flange of a lower denture caused by rapid heating during a curing cycle is called_____________? a. Localised Shrinkage porosity b. Gas inclusion porosity c. Micro porosity d. Surface porosity
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22) The particle size in microfilled composites is_____________? a. 0.05 to 0.04mm b. 0.5 to 1.0 microns c. 0.01 to 0.1 microns d. 0.3 to 0.4mm
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23) A material which is a mixture of two different materials and its properties are_____________? a. Composite b. Complex material c. Combined d. Compound
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24) Co-efficient of thermal expansion is highest for_____________? a. Amalgam b. Silicate cement c. Gold alloy d. Acrylic resin
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25) The latest method of curing denture base resins______________? a. Heat b. Visible light c. Chemicals d. Lasers
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26) One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________? a. Prevent galvanic action b. Are practically insoluble in oral fluids c. Adapt to the walls of the cavity better d. Have a higher coefficient of thermal expansion
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27) To cure a heat cure resin, a proper heating cycle is necessary_____________? a. To prevent the porosity b. To prevent warpage c. To prevent volume expansion d. All of the above
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28) When restoring a tooth with resin material, acid etching can do all of the following except______________? a. Increase the surface area b. Permit chemical bonding between resin and enamel c. Create surface irregularities in enamel for better mechanical retention of resin d. Condition the tooth surface for better wetting
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29) For esthetic areas where high luster is required the restoration used usually______________? a. Glass ionomer restoratives b. Hybrid resin composites c. Microfilled resin composites d. Macrofilled resin composites
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30) Which of the following absorbs maximum amount of water ? a. Microfilled resin b. Macrofilled resin c. Hybrid d. Light cure activated
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31) The restoration which shows percolation and shrinkage along the margins is_____________? a. Composites b. Unfilled resins c. Amalgam d. Polycarboxylate
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32) The commonly used laser for curing composite resin is______________? a. Nd:YAG b. CO2 c. ER:YAG d. Argon
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33) What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________? a. 6% b. 8% c. 10% d. 21%
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34) Macromolecules in Dental Resin is attached by______________? a. Covalent bonds b. sonic bonds c. Vander Wall’s Forces d. Hydrogen Bonds
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35) Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor_____________? a. Biological properties b. Thermal properties c. Mechanical properties d. Esthetic properties
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36) The most common coupling agents are organic silicon compound called_______________? a. Parabane b. Ligane c. Silane d. Chelane
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37) One bottle system of adhesive resins_____________? a. 4th generation bonding agents b. Separate etching step not required c. Separate etching step is still required d. Contains only primer
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38) Most advantageous indication of acid etching is______________? a. Decrease micro leakage b. Decrease polymerization shrinkage c. Decrease coefficient of thermal expansion d. Decrease porosity in restorative material
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39) VLC resins are also called as______________? a. Microwave-activated resins b. Tertiary amine-activated resins c. Light activated resins d. Heat activated resins
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40) Cold cure acrylic expand in water by___________? a. 1% by volume 0.23% by weight b. 10% by volume 0.23% by weight c. 0.1% by volume 0.23% by weight d. None of the above
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