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1) Two in one stage impression materials include______________? a. Zinc Oxide eugenol impression paste b. Hydrocolloid impression material c. Elastomeric impression material d. All of the above
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2) A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________? a. Injecting technique b. Laminate technique c. Immersion technique d. Tempering technique
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3) Which of the following impression materials is easy to pour and difficult to remove the stone cast from the impression ? a. Addition polysilicone b. Condensation polysilicone c. Polyether d. Polysulfide
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4) Rough and irregular surface produced on the impression is because of ? a. Improper application of pressure during impression making b. Air incorporated during mixing c. Too rapid polymerization d. Presence of moisture in impression area
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5) The impression materials with lowest viscosity is_____________? a. Plaster of paris b. Agar – agar c. Zinc oxide eugenol d. Elastomers
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6) The ranking of tear strength from the lowest to highest of all impression materials generally is as follows_______________? a. Hydrocolloids, silicones, polyether, polysulfide b. Silicones, hydrocolloids, polyether, polysulfide c. Polysulfide, hydrocolloids, silicones, polyether d. Hydrocolloids, polyether, silicones, polysulfide
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7) Most mucostatic among the following_____________? a. Impression compound b. Alginate c. ZOE paste d. Elastomer
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8) Which of the following impression material requires a hardener ? a. Agar b. Alginate c. Elastomers d. Impression compound
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9) By product of condensation reaction between silicone base and alkyl silicate in presence of tin octate_______________? a. Ethyl alcohol b. Glycol c. Acetate d. Propanolol
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10) Which of the following component acts as an accelerator in ZOE impression paste ? a. Zinc Sulphate & Zinc chloride b. Zinc chloride & Eugenol c. Zinc Sulphate & Eugenol d. Glycerin
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11) Dimensional stability of elastomeric impression material can be given in descending order as_____________? a. Polysulphide > polyether > Condensation silicone > Addition silicone b. polyether > Condensation silicone > Polysulphide > Addition silicone c. Addition silicone > polyether > Polysulphide > Condensation silicone d. Addition silicone> Condensation silicone > Polysulphide > polyether
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12) A laminate impression technique utilizes_______________? a. Syringe agar and chilled tray alginate b. Syringe agar and tray agar c. Syringe agar and impression compound d. Chilled alginate and impression compound
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13) Most flexible impression material______________? a. Impression compound b. Impression paste c. Addition silicone d. Alginate
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14) Which of the following is correct arrangement of impression material regarding linear contraction in ascending order ? a. Addition silicone < polyether < polysulfide < condensation silicone b. Addition silicone < polysulfide < Polyether < condensation silicone c. condensation silicone < polyether < polysulfide < Addition silicone d. condensation silicone < polysulfide < polyether < Addition silicone
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15) Which of the following best describes the working time of impression material ? a. After the start of appearing elastic properties of impression material b. Just after the start of appearing elastic properties of impression material c. The time for start of mixing till just before the start of appearing elastic properties of impression material d. Loss of lusture of impression material
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16) Which of the following is used as surface hardener in Impression material ? a. 2% Potassium sulfate b. 0.2% Potassium sulfate c. 2% sodium sulfate d. 4% Potassium sulfate
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17) Which of the following is correct regarding chemical setting of condensation silicone_______________? a. Polymerization occurs with repeated elimination of small molecules b. Polymerization occurs with elimination of single byproduct c. By condensation of repeated molecules of monomers d. Condensation does not occur at all
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18) Dimensional stability of hydrocolloid impressions may be achieved by_________________? a. Using less water powder ratio b. Storing the impression under water c. Prolonged manipulation d. Using humidor
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19) To make the vinyl Polysiloxane hydrophilic the following is added_______________? a. Mineral oil b. Surfactant c. Water d. Plasticizer
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20) The role of magnesium chloride in zinc oxide eugenol impression paste_________________? a. Retarder b. Modifier c. Plasticier d. Accelerator
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21) Alginates are made dust free by adding______________? a. Glycol b. Glyecrol c. Glutamic acid d. alcohol
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22) The process of changing the rubber base product or liquid polymer, to a rubber like material is generally known as_____________? a. Boiling b. Condensation c. Vulconization d. Chain lengthening
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23) Which of the following is not true about elastomeric impression ? a. Single mix material have higher viscosity b. Shear thinning is related to viscosity of non phase impression material c. Improper mixing of material can cause permanent deformation of impression d. Putty – wash technique of impression reduces dimensional change of setting
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24) Impression compound is characterized by all of the following except_______________? a. Warps at room temperature b. Is a thermoset material c. Shows increased flow when kneaded with water d. Low coefficient of thermal conductivity
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25) Rapid removal of rubber impression with a single firm motion results in____________________? a. Reduced dimensional instability b. Improved adhesion of the impression to the tray c. Minimal permanent deformation d. Reduced contamination by saliva
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26) Which of the following impression material is rigid ? a. Zinc oxide-eugenol b. Reversible hydrocolloid c. Alginate d. Polysulphide rubber
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27) Elastomers except: Polyether are_______________? a. Hydrophilic b. Hydrophobic c. Water loving impression materials d. Potassium alginates
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28) Hardening solutions are used with impression made of________________? a. Hydrocolloid b. Impression compound c. Elastomer d. Zinc oxide eugenol
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29) Alginate impression material is similar to Agar-agar impression material in the following respect________________? a. Gelation increase in both on increase in temperature b. Mixing time is increased to reduce the setting time c. Deformation during removal of impression occurs due to distortion of gel fibers d. Both can be re-used for fresh impressions
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30) Gelation temparature of agar is between________________? a. 20°C to 25°C b. 27°C to 33°C c. 37°C to 50°C d. 55°C to 60°C
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31) Brush heap structure is found in______________? a. Zinc oxide impression material b. Agar c. Condensation silicone d. Polyether
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32) Masterial causing minimum tissue distortion is______________? a. Polysulphide b. Silicone c. Impression plaster d. Zinc oxide eugenol paster
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33) Inelastic impression material is_____________? a. Impression compound b. Alginate c. Agar-agar d. Polyether
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34) One of the most important advantages of truly elastic impression material would be its capacity for______________? a. Close adaptation to soft tissues b. With drawl without permanent distortion c. Reproduction of surface details d. Compatibility with gypsum products
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35) Impression compound base_____________? a. Low thermal conductivity b. Crystalline structure c. Formation of cross linkage with heating d. High fusion temperature
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36) Hypersensitivity reactions like contact dermatitis can be caused by______________? a. polysulfides b. Condensation silicones c. addition silicones d. Polyether
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37) Trisodium phosphate in alginate acts are_______________? a. Retarder b. Reactor c. Accelerator d. Plasticizer
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38) Which of the following impression material is elastic________________? a. Impression compound b. Zinc Oxide eugenol (ZOE) paste c. Wax d. Polyvinyl siloxane
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39) The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________? a. 19 b. 20 c. 21 d. 26
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40) Elastomers are_________________? a. Alginate b. Agar c. Polyethers d. Imp. Compound
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