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99

Biomaterial Preparation (Dr. Yin Sithoen)

 

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1) Which of the following polymer systems are used for the organic matrix in composites ?

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2) The impression material which is routinely used in auto mixing devicee system is πŸ˜•

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3) Greater ratio fo zinc oxide to eugenol will have the following effect on setting time πŸ˜•

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4) Wrought metal πŸ˜•

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5) The main advantage of composites compared to silicates cement is πŸ˜•

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6) Property which distinguishes composites from filled acrylic resins πŸ˜•

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7) Condensation of porcelain is done by all the methods except πŸ˜•

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8) Zinc oxide eugenal impression should be removed from oral cavity :

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9) Crystal structures of metals are all the following except πŸ˜•

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10) The light-cured restorative resins have advantages over chemically activated restorative resins as πŸ˜•

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11) Stiffness of the material with passage of time is maximum in πŸ˜•

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12) Nickel in base metal alloys increase its πŸ˜•

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13) One of the disadvantages of using quartz as filler in restorative resin is πŸ˜•

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14) Which of the following material has a high coefficient of thermal expansion ?

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15) Dental personnel can do which one of the following to limit their exposure to mercury ?

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16) Color stability of cold-cured resins is inferior to that of heat cured resins due to πŸ˜•

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17) The most commonly used implant type presently is πŸ˜•

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18) Which of the following is called periphery wax ?

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19) In a porcelain fused to metal restoration, when the coefficient of thermal expansion of metal and porcelain are different πŸ˜•

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20) Binder in the phosphate investment is πŸ˜•

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21) Which of the following properties would be of least importance, when selecting an impression material ?

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22) The tendency of stainless steel to break under repeated condition of cyclic stressing below the ultimate strength is πŸ˜•

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23) Of the four types of gold casting alloys, the most commonly used for crowns and bridges is πŸ˜•

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24) Spot out incorrect statement regarding zinc in dentistry πŸ˜•

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25) Which of the following is recommended as an adhesive to trays with polysulfides ?

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26) Following are the functions of impression compound except πŸ˜•

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27) Minimum light exposure time for composite resins should be πŸ˜•

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28) For proper wetting, contact angle should be ideally πŸ˜•

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29) An anterior fixed partial denture could have facings constructed of which of the following materials ?

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30) Which one of the following represents the maximum safe concentration of mercury vapor in the breathing zone for a 40-hour work week ?

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31) Full denture bases are usually made from which of the following materials ?

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32) Modifiers are added to plaster of Paris mainly to πŸ˜•

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33) Alginate impression material deteriorates rapidly at πŸ˜•

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34) Commonly used filler in composite is πŸ˜•

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35) Which one of the following is not a criterion for a failed high-copper dental amalgam restorations ?

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36) The fluoride release from glass ionomer cement is πŸ˜•

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37) The purpose of burnishing the amalgam after condensation is to πŸ˜•

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38) In deep caities, the resin which remains unpolymerized can cause πŸ˜•

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39) The cavity for a GIC restoration is preconditioned with πŸ˜•

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40) Which one of the following phases in dental amalgam restoration has the best mechanical properties ?

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41) The most accurate polysulfide impressions are made by using a custom acrylic tray because πŸ˜•

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42) Materials having coefficient of thermal expansion close to the tooth structure πŸ˜•

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43) Which of the following metals currently are used in dental alloys ?

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44) The cracks formed on the ceramic during cooling because πŸ˜•

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45) In dental porcelains metallic oxides provide πŸ˜•

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46) Light source in the curing unit is usually πŸ˜•

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47) Which of the following office conditions minimize the health hazard from spilled mercury ?

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48) Nickel sensitivity in the general population is πŸ˜•

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49) Which of the following is the best choice of restorative material to achieve moderate to high strength, fluorite release, and esthetics ?

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50) Noble metal alloys are classified according to their πŸ˜•

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51) The common characteristic for pit and fissure sealant composite resins, acrylic appliances and elastomeric impression materials is :

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52) Bis-GMA is a reaction product of πŸ˜•

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53) Which of the following initiator-accelerator systems is needed for a light-activated composite?

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54) Which of the following statements about adhesion of composite restorations to tooth structure are true ?

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55) Montan waxes have the following properties except πŸ˜•

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56) Which of the following waxes is obtained from distillation of petroleum ?

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57) The following statements about dental porcelains are true except πŸ˜•

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58) The energy absorbed by a material when it is stressed to its proportional limit is πŸ˜•

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59) Dental porcelains are manufactured by a process termed as πŸ˜•

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60) Hydrocolloid impression should be removed from the mouth with a sharp jerk because πŸ˜•

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61) Which of the following properties are higher for microhybrid composites than for microfilled composites ?

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62) The light from the visible light curing unit can cause πŸ˜•

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63) Hand instruments for composites are made of πŸ˜•

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64) Once amalgamation has occurred, which of the following is true of mercury ?

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65) Which of the following waxes used to align of castings before soldering ?

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66) Strain that occurs when the material is stressed to its proportional limit is called πŸ˜•

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67) Commonly used coloring agent in impression plaster is πŸ˜•

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68) The temperature at which a solid changes into liquid is called πŸ˜•

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69) Passiveness of chrome cobalt alloys is due to formation of πŸ˜•

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70) Compared to lathe-cut alloy, spherical dental amalgam alloys πŸ˜•

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71) One of the following statements which one is incorrect regarding addition silicones πŸ˜•

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72) For luting purpose, the film thickness should be πŸ˜•

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73) Which of the following phases in dental amalgam restoration has the best mechanical properties ?

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74) Adhesion in composites is due to πŸ˜•

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75) Which of the composites with the following fillers may be radiopaque ?

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76) Porcelain denture teeth πŸ˜•

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77) Crystalline materials have πŸ˜•

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78) The main resin constituent of polishable composite resin is πŸ˜•

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79) The reason zinc oxide eugenol cement is used as a temporary restoration πŸ˜•

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80) Which of the following properties of calcium hydroxide cement help in the formation of reparative dentin ?

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81) Which of the following components acts as a refractory material in porcelain ?

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82) Side effects and complications resulting from treatment by a physician or dentist is πŸ˜•

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83) A portion of a posterior tooth that is subject to high biting forces would likely be restored with which of the following ?

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84) Porosity in denture base resins can be due to πŸ˜•

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85) Softening of impressing compound is best accomplished by πŸ˜•

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86) Sulfur contamination from natural latex gloves inhibits the setting of πŸ˜•

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87) KHN of enamel is πŸ˜•

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88) The desirable quality of porcelain is πŸ˜•

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89) The most effective cement in stimulating tertiary dentin is πŸ˜•

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90) The product that is formed on the surface of the amalgam restoration and frequently result in discoloration is πŸ˜•

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91) Which of the following elastomers is suited for multiple cast pouring πŸ˜•

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92) The noble or base metal alloys used for PFM should have the following requisite :

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93) The maximum warpage of acrylic denture occurs during πŸ˜•

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94) Ideal method firing of porcelain is by using πŸ˜•

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95) Which of the following sentences describes the construction of removable partial dentures ?

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96) The physical properties most desirable in set amalgam are which of the following ?

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97) Inorganic phase in a composite matrix πŸ˜•

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98) Which of the following statements is true regarding zinc phosphate cement ?

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99) All of the following are properties of Co-Cr-Ni wires except πŸ˜•

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100) Proportional limit is defined as :

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101) Which one of the following is not true about high-copper dental amalgam restorations ?

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102) The appropriate proportion of polymer to monomer component of dental resin by volume is generally πŸ˜•

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103) Pick out the incorrect statement regarding alginate impressions πŸ˜•

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104) Commonly used viscosity controller in composites is πŸ˜•

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105) Biting force in the molar region ranges from πŸ˜•

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106) Excess composite from the labial surfaces can be removed by using πŸ˜•

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107) Strength of dental porcelain is dependent on πŸ˜•

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108) In alginate impression the final gel is πŸ˜•

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109) A full crown on a maxillary anterior tooth may be restored with which of the following restorative materials ?

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110) The main ingredient of casting waxes is πŸ˜•

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111) A direct restorative material used frequently to restore a portion of a posterior tooth that is subject to large biting forces would possess which of the following properties ?

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112) The catalyst used for condensation silicones is πŸ˜•

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113) The main use of zinc oxide eugenol cement is πŸ˜•

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114) Impression compound is characterized by πŸ˜•

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115) The type of stress to which dental amalgam is more resistant to πŸ˜•

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116) Resistance of a liquid to motion is called πŸ˜•

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117) Thermal conductivity is proportional to πŸ˜•

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118) The main function of zinc in amalgam is πŸ˜•

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119) Regarding Knoop hardness number, which of the following material is closest to that of dentine (KHN 65) ?

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120) Which of the following statements apply to the packable composites ?

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121) Greening effect of porcelain is due to πŸ˜•

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122) The gelation temperature of agar hydrocolloid impression material should be πŸ˜•

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123) All are properties of waxes except πŸ˜•

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124) Elgiloy arch wire is πŸ˜•

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125) The byproduct in condensation silicones is πŸ˜•

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126) Which of the following occurs when dental amalgam is overmixed ?

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127) Main disadvantage of laminate technique of making impression is : ?

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128) Clinical significance of smear layer :

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129) Stearic acid in impression compound πŸ˜•

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130) The reason for hydroxyapatite coating on implant biomaterials is πŸ˜•

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131) Gold casting alloys are classified as type I, II, III or IV among these, having highest hardness is πŸ˜•

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132) The constituent that acts as a binder in the investment is πŸ˜•

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133) When the gold content of gold alloys increases πŸ˜•

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134) Amalgam is less prone to corrosion πŸ˜•

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135) Which of the following composites give rough surfaced finish ?

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136) Which of the following is a measure of resistance to fracture ?:

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137) Which of the following represents the maximum safe concentration of mercury vapor in the breathing zone for a 40-hour workweek ?

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138) Gypsum investments should not be heated above πŸ˜•

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139) One of the following statements which one is incorrect regarding polyether :

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140) Which of the following statements about compomers are true ?

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141) Most common use of Zinc oxide eugenol paste πŸ˜•

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142) Which of the following is a measure of resistance to fracture ?

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143) In visible light-cured composites photo initiator molecule is πŸ˜•

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144) The restorative material used to restore a small portion of an anterior tooth should have which of the following properties ?

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145) In an alloy oxygen scavenger is πŸ˜•

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146) The primary difference between low- and high-copper amalgams is which of the following ?

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147) Cavity varnish should not be applied when the following is used as a filling material πŸ˜•

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148) Which of these statements are correct in terms of preparing a correctly triturated mass of amalgam ?

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149) In a porcelain fused to metal restoration, the porcelain is-bonded to metal by πŸ˜•

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150) The function of gum dammar in inlay wax is πŸ˜•

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151) Conventional dental amalgam alloy contains πŸ˜•

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152) A potentially toxic element in base metal alloys is πŸ˜•

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153) Silver has all the following characteristics except πŸ˜•

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154) Which of the following is used to alter contour of impression trays ?

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155) Contamination of zinc-containing amalgam by moisture during triturating or condensation :

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156) Acrylic resins are used in which of the following ?

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157) The most commonly employed alloy combination for use in implants is πŸ˜•

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158) Which of the following sentences describes the construction of removable partial dentures ?

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159) The physical property measured in terms of the deformation of the structure per until dimensions is ?

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160) A cavity varnish used for lining the preparation for a dental amalgam restoration will :

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161) Hypersensitivity reactions like contact dermatitis is caused by πŸ˜•

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162) Carnauba wax is preferred to candelilla wax as πŸ˜•

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163) Working time of denture resin should be at least πŸ˜•

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164) Which statements are true for bonding of amalgam to tooth structure ?

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165) Oil of clove is sometimes used in preference to eugenal in ZOE paste because :

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166) Which of the following phases in dental amalgam restoration is most prone to electrochemical properties ?

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167) If the light cure resin is curd in increments, it helps in πŸ˜•

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168) Distortion on removal from undercuts in addition silicones is very less due to πŸ˜•

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169) Proconditioning before GIC restoration is done in order to πŸ˜•

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170) Which one of the following office conditions minimize the health hazard from spilled mercury ?

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171) Polyether is different from other elastomers in the following aspects πŸ˜•

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172) The strain at which the plastic strain develops may be represented by πŸ˜•

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173) Gold with high percentage elongation is best for πŸ˜•

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174) Most commonly used pit and fissure sealant is πŸ˜•

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175) When a mechanical device is used for mixing addition silicones πŸ˜•

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176) Higher mercury left in an amalgam leads to which of the following ?

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177) Setting time of alginate can be better controlled by πŸ˜•

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178) Which of the following composite is recommended for non stress bearing anterior restoration ?

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179) Which of the following statements about laboratory composites are true ?

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180) Which has the highest viscoelastic property and requires more time to recover from deformation ?

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181) Thickness of the gel between the tray and tissue for either agar or alginate should always be at least πŸ˜•

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182) Setting of plaster of Paris is a result of πŸ˜•

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183) The temperature at which a solid changes to liquid is known as its πŸ˜•

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184) For each property, list the amalgam type (irregular low-copper, admixed high-copper, and spherical high-copper ) that has the highest value?.

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185) Minimal thickness of base for adequate thermal insulation is πŸ˜•

186 / 218

186) Dispensing composite resins using a syringe is advantageous because it πŸ˜•

187 / 218

187) An anterior fixed partial denture could have facings constructed of which of the following materials ?

188 / 218

188) Which of the following statements about curing of composites are true ?

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189) The greatest amount of dimensional change after setting is exhibited by πŸ˜•

190 / 218

190) Main disadvantage of denture base soft reliner is πŸ˜•

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191) Metal has the following properties except πŸ˜•

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192) Oxalates, carbonates, potassium, trisodium phosphates are added to alginate as πŸ˜•

193 / 218

193) Which of the following statements is incorrect regarding hydroxyapatite as an implant material ?

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194) Which one of the following mixing methods permits the escape of dental amalgam mercury vapor ?

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195) Ideal metal used for electroplating polysulfide impression is πŸ˜•

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196) Which of the following uses a hardened steel ball indenting tool ?

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197) Cobalt-chromium alloy is mostly used for the construction of πŸ˜•

198 / 218

198) Which of these statements apply to the filler particles of composites ?

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199) Silver in the set amalgam alloy tends to have the following effect πŸ˜•

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200) Chemically cured resin shrinks:?

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201) Potato starch is contained in which impression material ?

202 / 218

202) Which of the following materials are used for dental implants ?

203 / 218

203) A small portion of an anterior tooth would most likely be restored with which of the following ?

204 / 218

204) Porcelain-bonded to metal is stronger when fired πŸ˜•

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205) The chemistry behind the condensation of the amalgam is to πŸ˜•

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206) In the cavities which are more than 2mm deep a light-cured restoration is πŸ˜•

207 / 218

207) In UV curing system the activator employed is πŸ˜•

208 / 218

208) A measure of ductility of a material is referred to as πŸ˜•

209 / 218

209) Which one of the following phases in dental amalgam restoration is most prone to electrochemical corrosion ?

210 / 218

210) Impression plaster is a πŸ˜•

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211) Calcium hydroxide is used for πŸ˜•

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212) A glaze is placed over the finished composite restoration to πŸ˜•

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213) In dental plaster the main ingredient is πŸ˜•

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214) Which of the following mixing methods permits the escape of dental amalgam mercury vapor ?

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215) Wet porcelain is condensed properly before firing to enhance all the properties except : ?

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216) Which of the following base is contraindicated for composites ?

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217) Glass ionomer cenment is not recommended for πŸ˜•

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218) Ideally, the set amalgam should do which of the following ?

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