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Biomaterial Preparation (Dr. Yin Sithoen)

 

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1) Noble metal alloys are classified according to their 😕

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2) Spot out incorrect statement regarding zinc in dentistry 😕

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3) Montan waxes have the following properties except 😕

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4) Main disadvantage of denture base soft reliner is 😕

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5) The main ingredient of casting waxes is 😕

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6) Cavity varnish should not be applied when the following is used as a filling material 😕

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7) One of the disadvantages of using quartz as filler in restorative resin is 😕

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8) The most accurate polysulfide impressions are made by using a custom acrylic tray because 😕

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

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

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

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

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

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14) Color stability of cold-cured resins is inferior to that of heat cured resins due to 😕

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

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

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17) The temperature at which a solid changes into liquid is called 😕

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18) Ideal method firing of porcelain is by using 😕

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19) The fluoride release from glass ionomer cement is 😕

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20) The main use of zinc oxide eugenol cement is 😕

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

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22) 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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23) Dispensing composite resins using a syringe is advantageous because it 😕

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

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

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26) Hand instruments for composites are made of 😕

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27) Proportional limit is defined as :

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28) Minimal thickness of base for adequate thermal insulation is 😕

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29) Materials having coefficient of thermal expansion close to the tooth structure 😕

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30) Stiffness of the material with passage of time is maximum in 😕

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31) Dental porcelains are manufactured by a process termed as 😕

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

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

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34) The main advantage of composites compared to silicates cement is 😕

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

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36) In dental plaster the main ingredient is 😕

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37) A potentially toxic element in base metal alloys is 😕

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38) 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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39) The product that is formed on the surface of the amalgam restoration and frequently result in discoloration is 😕

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40) Gold with high percentage elongation is best for 😕

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41) Commonly used coloring agent in impression plaster is 😕

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42) The maximum warpage of acrylic denture occurs during 😕

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43) Chemically cured resin shrinks:?

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44) Impression compound is characterized by 😕

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45) In deep caities, the resin which remains unpolymerized can cause 😕

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46) Gypsum investments should not be heated above 😕

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47) The following statements about dental porcelains are true except 😕

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

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49) Bis-GMA is a reaction product of 😕

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50) Strength of dental porcelain is dependent on 😕

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51) Commonly used filler in composite is 😕

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52) Biting force in the molar region ranges from 😕

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53) The reason zinc oxide eugenol cement is used as a temporary restoration 😕

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54) The cavity for a GIC restoration is preconditioned with 😕

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55) The constituent that acts as a binder in the investment is 😕

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56) Light source in the curing unit is usually 😕

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57) The main function of zinc in amalgam is 😕

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

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

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

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62) Elgiloy arch wire is 😕

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63) Which of the following elastomers is suited for multiple cast pouring 😕

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64) Setting of plaster of Paris is a result of 😕

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65) Oxalates, carbonates, potassium, trisodium phosphates are added to alginate as 😕

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66) Pick out the incorrect statement regarding alginate impressions 😕

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67) The type of stress to which dental amalgam is more resistant to 😕

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68) Silver in the set amalgam alloy tends to have the following effect 😕

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

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

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71) The desirable quality of porcelain is 😕

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

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74) Binder in the phosphate investment is 😕

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75) The strain at which the plastic strain develops may be represented by 😕

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76) Softening of impressing compound is best accomplished by 😕

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

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78) Most commonly used pit and fissure sealant is 😕

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

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

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81) The reason for hydroxyapatite coating on implant biomaterials is 😕

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82) If the light cure resin is curd in increments, it helps in 😕

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83) Conventional dental amalgam alloy contains 😕

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84) The function of gum dammar in inlay wax is 😕

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85) Compared to lathe-cut alloy, spherical dental amalgam alloys 😕

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86) The main resin constituent of polishable composite resin is 😕

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87) When the gold content of gold alloys increases 😕

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88) Condensation of porcelain is done by all the methods except 😕

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

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

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

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92) Hydrocolloid impression should be removed from the mouth with a sharp jerk because 😕

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93) Stearic acid in impression compound 😕

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94) Polyether is different from other elastomers in the following aspects 😕

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95) Most common use of Zinc oxide eugenol paste 😕

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96) For proper wetting, contact angle should be ideally 😕

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97) Porcelain denture teeth 😕

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98) Metal has the following properties except 😕

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

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100) The chemistry behind the condensation of the amalgam is to 😕

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101) The purpose of burnishing the amalgam after condensation is to 😕

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102) Porosity in denture base resins can be due to 😕

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103) 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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104) When a mechanical device is used for mixing addition silicones 😕

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

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

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107) The appropriate proportion of polymer to monomer component of dental resin by volume is generally 😕

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108) The tendency of stainless steel to break under repeated condition of cyclic stressing below the ultimate strength is 😕

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

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110) Working time of denture resin should be at least 😕

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111) The energy absorbed by a material when it is stressed to its proportional limit is 😕

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112) Carnauba wax is preferred to candelilla wax as 😕

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113) Cobalt-chromium alloy is mostly used for the construction of 😕

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

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

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

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117) The light from the visible light curing unit can cause 😕

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

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119) Calcium hydroxide is used for 😕

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120) Strain that occurs when the material is stressed to its proportional limit is called 😕

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

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122) Following are the functions of impression compound except 😕

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123) In UV curing system the activator employed is 😕

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124) Gold casting alloys are classified as type I, II, III or IV among these, having highest hardness is 😕

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125) The greatest amount of dimensional change after setting is exhibited by 😕

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126) The byproduct in condensation silicones is 😕

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127) Glass ionomer cenment is not recommended for 😕

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

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129) Excess composite from the labial surfaces can be removed by using 😕

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130) Thickness of the gel between the tray and tissue for either agar or alginate should always be at least 😕

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131) The most commonly used implant type presently is 😕

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

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

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134) Sulfur contamination from natural latex gloves inhibits the setting of 😕

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

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136) The cracks formed on the ceramic during cooling because 😕

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

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

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

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140) Impression plaster is a 😕

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141) In visible light-cured composites photo initiator molecule is 😕

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

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143) Greening effect of porcelain is due to 😕

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

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

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146) Amalgam is less prone to corrosion 😕

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147) Of the four types of gold casting alloys, the most commonly used for crowns and bridges is 😕

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148) Property which distinguishes composites from filled acrylic resins 😕

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

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150) In the cavities which are more than 2mm deep a light-cured restoration is 😕

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151) Resistance of a liquid to motion is called 😕

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

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153) In an alloy oxygen scavenger is 😕

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154) Adhesion in composites is due to 😕

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155) A glaze is placed over the finished composite restoration to 😕

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156) Alginate impression material deteriorates rapidly at 😕

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

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158) Crystal structures of metals are all the following except 😕

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159) Proconditioning before GIC restoration is done in order to 😕

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160) Clinical significance of smear layer :

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

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162) For luting purpose, the film thickness should be 😕

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163) In dental porcelains metallic oxides provide 😕

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164) Modifiers are added to plaster of Paris mainly to 😕

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165) Potato starch is contained in which impression material ?

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166) The impression material which is routinely used in auto mixing devicee system is 😕

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167) Side effects and complications resulting from treatment by a physician or dentist is 😕

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168) Porcelain-bonded to metal is stronger when fired 😕

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

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

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171) Ideal metal used for electroplating polysulfide impression is 😕

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172) Inorganic phase in a composite matrix 😕

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173) KHN of enamel is 😕

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

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

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176) Silver has all the following characteristics except 😕

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

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178) Setting time of alginate can be better controlled by 😕

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179) In a porcelain fused to metal restoration, the porcelain is-bonded to metal by 😕

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180) One of the following statements which one is incorrect regarding addition silicones 😕

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181) A measure of ductility of a material is referred to as 😕

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

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183) Wrought metal 😕

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184) Minimum light exposure time for composite resins should be 😕

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185) Hypersensitivity reactions like contact dermatitis is caused by 😕

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186) All are properties of waxes except 😕

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

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188) The most effective cement in stimulating tertiary dentin is 😕

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

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190) Crystalline materials have 😕

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191) Thermal conductivity is proportional to 😕

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

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193) 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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194) The catalyst used for condensation silicones is 😕

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195) All of the following are properties of Co-Cr-Ni wires except 😕

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196) In a porcelain fused to metal restoration, when the coefficient of thermal expansion of metal and porcelain are different 😕

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

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

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199) Greater ratio fo zinc oxide to eugenol will have the following effect on setting time 😕

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

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201) Passiveness of chrome cobalt alloys is due to formation of 😕

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202) Commonly used viscosity controller in composites is 😕

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

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

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

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

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207) Nickel in base metal alloys increase its 😕

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

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209) The most commonly employed alloy combination for use in implants is 😕

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210) The light-cured restorative resins have advantages over chemically activated restorative resins as 😕

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211) In alginate impression the final gel is 😕

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

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213) The temperature at which a solid changes to liquid is known as its 😕

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

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215) Which of the following is called periphery wax ?

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216) Distortion on removal from undercuts in addition silicones is very less due to 😕

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217) The gelation temperature of agar hydrocolloid impression material should be 😕

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218) Nickel sensitivity in the general population is 😕

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