This is a collection of Past MCQs of Dental Materials on the topic Amalgams. Very Useful for AIIMS, PGIMER, AIPGEE, COMEDK, NBDE, NDEB, ADA, etc

1. MCQs on
Dental
Materials
Amalgamswww.dentaldevotee.blogspot.com

2. # The term "trituration" means :
A. Lysing amalgam alloy
B. Mixing of amalgam alloy and mercury
C. Removal of excess of mercury
D. None of the above
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3. # The term "trituration" means :
A. Lysing amalgam alloy
B. Mixing of amalgam alloy and mercury
C. Removal of excess of mercury
D. None of the above
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4. # Dynamic creep is the:
A. Continuing alloying between Silver-Tin alloy and mercury
during the life of the restoration
B. Deformation of set amalgam during function
C. Process whereby alloy is wetted by mercury
D. Spread of amalgam during packing
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5. # Dynamic creep is the:
A. Continuing alloying between Silver-Tin alloy and mercury
during the life of the restoration
B. Deformation of set amalgam during function
C. Process whereby alloy is wetted by mercury
D. Spread of amalgam during packing
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6. # The highest concentration in amalgam filling is found:
A. At the margin of restoration
B. In the centre of the restoration
C. In the deepest part of the restoration
D. None of the above
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7. # The highest concentration in amalgam filling is found:
A. At the margin of restoration
B. In the centre of the restoration
C. In the deepest part of the restoration
D. None of the above
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8. # The dental amalgam is most resistant to:
A. Compressive stress
B. Impact stress
C. Shear stress
D. Tensile stress
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9. # The dental amalgam is most resistant to:
A. Compressive stress
B. Impact stress
C. Shear stress
D. Tensile stress
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10. # The ADA specification no. 1 for composition of amalgam
alloy recommends,
A. 65% silver, 32% tin and 3% copper
B. 49% silver, 32% tin and 19% copper
C. 65% silver, 29% tin and 5-6% copper
D. None of the above
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11. # The ADA specification no. 1 for composition of amalgam
alloy recommends,
A. 65% silver, 32% tin and 3% copper
B. 49% silver, 32% tin and 19% copper
C. 65% silver, 29% tin and 5-6% copper
D. None of the above
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12. # According to ADA sp. no. 1, the minimum compressive
strength for silver amalgam after one hour should be:
A. 80 Mpa
B. 140 Mpa
C. 260 Mpa
D. 510 Mpa
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13. # According to ADA sp. no. 1, the minimum compressive
strength for silver amalgam after one hour should be:
A. 80 Mpa
B. 140 Mpa
C. 260 Mpa
D. 510 Mpa
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14. # Which of the following phases of dental amalgam has
minimum strength ?
A. Gamma 1
B. Gamma 2
C. Gamma 3
D. Epsilon 1
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15. # Which of the following phases of dental amalgam has
minimum strength ?
A. Gamma 1
B. Gamma 2
C. Gamma 3
D. Epsilon 1
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16. # Admixed high copper alloy powder contains:
A. 9-20% copper
B. 13-20% copper
C. 9-30% copper
D. 13-30% copper
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17. # Admixed high copper alloy powder contains:
A. 9-20% copper
B. 13-20% copper
C. 9-30% copper
D. 13-30% copper
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18. # Compared to conventional amalgams, spherical amalgams:
A. Require more mercury
B. Require heavy compaction forces
C. Have longer setting time
D. None of the above
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19. # Compared to conventional amalgams, spherical amalgams:
A. Require more mercury
B. Require heavy compaction forces
C. Have longer setting time
D. None of the above
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20. # Finishing and polishing of amalgam causes ___________ of
the restoration.
A. Increase in tarnish and corrosion resistance
B. Increase in the marginal strength
C. Decrease the tarnish and corrosion resistance
D.Increase in the compressive strength
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21. # Finishing and polishing of amalgam causes ___________ of
the restoration.
A. Increase in tarnish and corrosion resistance
B. Increase in the marginal strength
C. Decrease the tarnish and corrosion resistance
D.Increase in the compressive strength
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22. # Which of the following statements about high copper silver
alloy compared to conventional alloy is not true?
A. It has increased tensile and compressive strength
B. It has poor tarnish and corrosion resistance
C. Its edge strength is greater
D. Mercury content in the final restoration is less.
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23. # Which of the following statements about high copper silver
alloy compared to conventional alloy is not true?
A. It has increased tensile and compressive strength
B. It has poor tarnish and corrosion resistance
C. Its edge strength is greater
D. Mercury content in the final restoration is less.
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24. # Setting time of amalgam is best controlled by:
A. Using spherical particles
B. Lathe cut alloy
C. Altering Hg-alloy ratio
D. Trituration time
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25. # Setting time of amalgam is best controlled by:
A. Using spherical particles
B. Lathe cut alloy
C. Altering Hg-alloy ratio
D. Trituration time
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26. # Increase in the residual mercury in silver amalgam filling
can:
A. Cause fracture of the filling
B. Cause tarnish and corrosion
C. Increase in strength
D. Decrease condensation pressure
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27. # Increase in the residual mercury in silver amalgam filling
can:
A. Cause fracture of the filling
B. Cause tarnish and corrosion
C. Increase in strength
D. Decrease condensation pressure
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28. # High Cu alloys have all of the following except:
A. High tensile strength
B. Low creep
C. High corrosion
D. None of the above
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29. # High Cu alloys have all of the following except:
A. High tensile strength
B. Low creep
C. High corrosion
D. None of the above
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30. # Chronic mercury toxicity results from:
A. Ingestion while removing old amalgam
B. Skin contact
C. Mercury vapor
D. All of the above
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31. # Chronic mercury toxicity results from:
A. Ingestion while removing old amalgam
B. Skin contact
C. Mercury vapor
D. All of the above
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32. # In non zinc containing dental amalgam alloy, the
percentage of zinc present is :
A. Less than 0.02 %
B. Less than 0.1 %
C. Less than 0.01 %
D. None of the above
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33. # In non zinc containing dental amalgam alloy, the
percentage of zinc present is :
A. Less than 0.02 %
B. Less than 0.1 %
C. Less than 0.01 %
D. None of the above
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34. # In spherical alloys as compared to lathe cut:
A. Less condensing force is required
B. More condensing force is required
C. Both require same condensing force
D. Manipulation is easy
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35. # In spherical alloys as compared to lathe cut:
A. Less condensing force is required
B. More condensing force is required
C. Both require same condensing force
D. Manipulation is easy
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36. # High copper dental amalgams are superior to other
amalgams because high copper dental amalgams:
A. have less marginal breakdown
B. are workable at lower Hg-alloy ratio
C. have a higher ratio of tensile to compressive strength
D. have less resistance to tarnish and corrosion
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37. # High copper dental amalgams are superior to other
amalgams because high copper dental amalgams:
A. have less marginal breakdown
B. are workable at lower Hg-alloy ratio
C. have a higher ratio of tensile to compressive strength
D. have less resistance to tarnish and corrosion
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38. # Well premeasured capsules of amalgam can release
mercury vapor during:
A. Mulling
B. Carving
C. Condensation
D. Trituration
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39. # Well premeasured capsules of amalgam can release
mercury vapor during:
A. Mulling
B. Carving
C. Condensation
D. Trituration
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40. # The largest component of amalgam alloy is :
A. Silver
B. Tin
C. Zinc
D. Copper
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41. # The largest component of amalgam alloy is :
A. Silver
B. Tin
C. Zinc
D. Copper
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42. # In a high copper amalgam, the phase which is eliminated is :
A. Gamma 1
B. Gamma 2
C. Gamma 1 and Gamma 2
D. No phase is eliminated
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43. # In a high copper amalgam, the phase which is eliminated is :
A. Gamma 1
B. Gamma 2
C. Gamma 1 and Gamma 2
D. No phase is eliminated
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44. # During amalgamation, trituration is done to:
A. dissolve the alloy in mercury
B. coat the alloy particles with mercury
C. remove excess mercury from amalgam
D. dissolve Hg in alloy
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45. # During amalgamation, trituration is done to:
A. dissolve the alloy in mercury
B. coat the alloy particles with mercury
C. remove excess mercury from amalgam
D. dissolve Hg in alloy
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46. # Moisture contamination of amalgam can lead to :
A. Marginal breakdown
B. Shrinkage
C. Delayed expansion
D. Increased stresses
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47. # Moisture contamination of amalgam can lead to :
A. Marginal breakdown
B. Shrinkage
C. Delayed expansion
D. Increased stresses
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48. # Amalgam restorations give the best clinical service when
the residual mercury content is :
A. 38-42%
B. 48-52%
C. 58-62%
D. 68-72%
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49. # Amalgam restorations give the best clinical service when
the residual mercury content is :
A. 38-42%
B. 48-52%
C. 58-62%
D. 68-72%
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50. # Discoloration of silver alloy is due to:
A. Tarnish
B. Tarnish and corrosion
C. Wet corrosion
D. Dry corrosion
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51. # Discoloration of silver alloy is due to:
A. Tarnish
B. Tarnish and corrosion
C. Wet corrosion
D. Dry corrosion
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52. # Percentage of tin in low copper alloy is :
A. 30-35%
B. 26-28%
C. 13-32%
D. 22-30%
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53. # Percentage of tin in low copper alloy is :
A. 30-35%
B. 26-28%
C. 13-32%
D. 22-30%
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54. # Advantage of zinc containing amalgam is :
A. Better handling property
B. Dimensional stability
C. Resistance to creep
D. Toxicity to pulp and dentin
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55. # Advantage of zinc containing amalgam is :
A. Better handling property
B. Dimensional stability
C. Resistance to creep
D. Toxicity to pulp and dentin
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56. # Cause of expansion in zinc containing amalgam is :
A. Zinc and water
B. Water
C. Hydrogen
D. Nascent oxygen
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57. # Cause of expansion in zinc containing amalgam is :
A. Zinc and water
B. Water
C. Hydrogen
D. Nascent oxygen
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58. # What is the working time of amalgam ?
A. One to two minutes
B. Three to four minutes
C. Five to six minutes
D. Seven to eight minutes
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59. # What is the working time of amalgam ?
A. One to two minutes
B. Three to four minutes
C. Five to six minutes
D. Seven to eight minutes
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60. # Which of the following amalgam alloys is least susceptible
to creep ?
A. Lathe cut
B. Spherical
C. Microfine
D. Dispersion with high copper
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61. # Which of the following amalgam alloys is least susceptible
to creep ?
A. Lathe cut
B. Spherical
C. Microfine
D. Dispersion with high copper
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62. # The percentage of copper in high copper alloy is :
A. 10-12%
B. 0-6%
C. 13-30%
D. 20-30%
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63. # The percentage of copper in high copper alloy is :
A. 10-12%
B. 0-6%
C. 13-30%
D. 20-30%
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64. # How soon after a moisture contamination does a zinc
containing amalgam alloy start expanding ?
A. 24 hrs
B. 1-2 days
C. 3-5 days
D. 7 days
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65. # How soon after a moisture contamination does a zinc
containing amalgam alloy start expanding ?
A. 24 hrs
B. 1-2 days
C. 3-5 days
D. 7 days
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66. # What is common in amalgam and ceramics?
A. More compressive strength but less tensile strength
B. More compressive strength and tensile strength
C. Less compressive strength but more tensile strength
D. Less compressive strength and tensile strength
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67. # What is common in amalgam and ceramics?
A. More compressive strength but less tensile strength
B. More compressive strength and tensile strength
C. Less compressive strength but more tensile strength
D. Less compressive strength and tensile strength
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68. # What is the most frequently used restorative material?
A. Silicate
B. Amalgam
C. Composite
D. Gold
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69. # What is the most frequently used restorative material?
A. Silicate
B. Amalgam
C. Composite
D. Gold
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70. # Which of the following constituents of amalgam alloy
decreases expansion?
A. Copper
B. Zinc
C. Silver
D. Tin
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71. # Which of the following constituents of amalgam alloy
decreases expansion?
A. Copper
B. Zinc
C. Silver
D. Tin
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72. # Which of the following silver amalgam alloys have the
maximum strength ?
A. Lathe cut
B. Spherical
C. Admixed
D. Single composition
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73. # Which of the following silver amalgam alloys have the
maximum strength ?
A. Lathe cut
B. Spherical
C. Admixed
D. Single composition
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74. # The higher the Hg alloy ratio in dental amalgam:
A. Higher the strength
B. Lower the creep value
C. More matrix material formed
D. More gamma 1 phase formed
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75. # The higher the Hg alloy ratio in dental amalgam:
A. Higher the strength
B. Lower the creep value
C. More matrix material formed
D. More gamma 1 phase formed
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76. # Copper content in low copper amalgams is :
A. 6%
B. 12-30%
C. 29%
D. 19%
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77. # Copper content in low copper amalgams is :
A. 6%
B. 12-30%
C. 29%
D. 19%
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78. # Ag-Cu eutectic alloy has a characteristic property of that
fusion temperature of :
A. the resultant alloy is greater
B. the resultant alloy is lesser
C. the resultant alloy varies according to the content of Ag
and Cu
D. None
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79. # Ag-Cu eutectic alloy has a characteristic property of that
fusion temperature of :
A. the resultant alloy is greater
B. the resultant alloy is lesser
C. the resultant alloy varies according to the content of Ag
and Cu
D. None
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80. # Which phase provides maximum strength in hardened
mercury/silver alloy ?
A. Silver/Mercury phase
B. Silver/Tin phase
C. Tin/Mercury phase
D. Zinc/Mercury phase
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81. # Which phase provides maximum strength in hardened
mercury/silver alloy ?
A. Silver/Mercury phase
B. Silver/Tin phase
C. Tin/Mercury phase
D. Zinc/Mercury phase
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82. # Absorption of mercury in the human body occurs least
from:
A. Lungs
B. Gastrointestinal tract
C. Skin
D. Kidneys
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83. # Absorption of mercury in the human body occurs least
from:
A. Lungs
B. Gastrointestinal tract
C. Skin
D. Kidneys
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84. # The tarnished layer of silver amalgam consists of :
A. Sulphides of silver
B. Oxides of tin
C. Chlorides of tin
D. All of the above
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85. # The tarnished layer of silver amalgam consists of :
A. Sulphides of silver
B. Oxides of tin
C. Chlorides of tin
D. All of the above
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86. # Which is not true about high copper amalgam alloys ?
A. Low tensile and compressive strength
B. Low Hg:alloy ratio
C. High tensile strength
D. Low creep
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87. # Which is not true about high copper amalgam alloys ?
A. Low tensile and compressive strength
B. Low Hg:alloy ratio
C. High tensile strength
D. Low creep
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88. # The threshold limit value of mercury exposures is :
A. 0.01 mg/m3
B. 0.05 mg/m3
C. 0.1 mg/m3
D. 0.001 mg/m3
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89. # The threshold limit value of mercury exposures is :
A. 0.01 mg/m3
B. 0.05 mg/m3
C. 0.1 mg/m3
D. 0.001 mg/m3
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90. # "Amalgam" means :
A. A metallic powder composed of silver, tin, copper and zinc
B. An alloy of two or more metals, one of which is mercury
C. An alloy of two or more metals that have been dissolved in
each other in the molten state
D. A metallic substance in powder or tablet form that is mixed
with mercury
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91. # "Amalgam" means :
A. A metallic powder composed of silver, tin, copper and zinc
B. An alloy of two or more metals, one of which is mercury
C. An alloy of two or more metals that have been dissolved in
each other in the molten state
D. A metallic substance in powder or tablet form that is mixed
with mercury
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92. # Mercury intoxication in dental office mainly results from :
A. Direct contact with mercury
B. Inhalation of mercury vapours
C. Ingestion of mercury
D. None of the above
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93. # Mercury intoxication in dental office mainly results from :
A. Direct contact with mercury
B. Inhalation of mercury vapours
C. Ingestion of mercury
D. None of the above
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94. # In amalgam alloy, which of following acts as oxygen
scavenger?
A. Cu
B. Zn
C. Pd
D. Ag
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95. # In amalgam alloy, which of following acts as oxygen
scavenger?
A. Cu
B. Zn
C. Pd
D. Ag
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96. # Over-trituration of silver alloy and mercury:
A. reduces contraction
B. increases the strength of lathe-cut alloy but reduces the
strength of spherical alloy amalgam
C. decreases creep
D. gives a dull and crumbly amalgam
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97. # Over-trituration of silver alloy and mercury:
A. reduces contraction
B. increases the strength of lathe-cut alloy but reduces the
strength of spherical alloy amalgam
C. decreases creep
D. gives a dull and crumbly amalgam
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98. # By increasing the percentage of which metal, the strength
and hardness of amalgam increases?
A. Ag
B. Zn
C. Cu
D. Hg
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99. # By increasing the percentage of which metal, the strength
and hardness of amalgam increases?
A. Ag
B. Zn
C. Cu
D. Hg
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100. # Mercury rich condition in a slow setting amalgam alloy
system inn a restoration results in :
A. Accelerated corrosion
B. Fracture of the restoration
C. Marginal damage
D. All of the above
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101. # Mercury rich condition in a slow setting amalgam alloy
system inn a restoration results in :
A. Accelerated corrosion
B. Fracture of the restoration
C. Marginal damage
D. All of the above
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102. # Which of the following statements is true regarding lathe
cut copper silver alloy ?
A. requires least amount of mercury
B. achieves high compressive strength at 1 hr.
C. has tensile strength, both at 15 minutes and 7 days is
comparable to high copper, unicompositional alloys
D. has lower creep value
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103. # Which of the following statements is true regarding lathe
cut copper silver alloy ?
A. requires least amount of mercury
B. achieves high compressive strength at 1 hr.
C. has tensile strength, both at 15 minutes and 7 days is
comparable to high copper, unicompositional alloys
D. has lower creep value
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104. # A true eutectic alloy has melting point:
A. Above that of the low fusing metal
B. above the melting point of either metal
C. Below that of the high fusing metal
D. Below the melting point of either metal
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105. # A true eutectic alloy has melting point:
A. Above that of the low fusing metal
B. above the melting point of either metal
C. Below that of the high fusing metal
D. Below the melting point of either metal
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106. # Creep value of which of the following is the highest ?
A. Low copper amalgam alloy
B. Admix alloy
C. Single composition alloys
D. Creep value of all the above mentioned alloys is same
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107. # Creep value of which of the following is the highest ?
A. Low copper amalgam alloy
B. Admix alloy
C. Single composition alloys
D. Creep value of all the above mentioned alloys is same
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108. # Advantages of minimum mercury technique or Eames
technique is all except:
A. High strength
B. Sets quickly
C. Needs no squeezing of excess mercury
D. Greater plasticity and adapts well to cavity walls
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109. # Advantages of minimum mercury technique or Eames
technique is all except:
A. High strength
B. Sets quickly
C. Needs no squeezing of excess mercury
D. Greater plasticity and adapts well to cavity walls
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110. # Amalgam achieves 70% of the strength by:
A. 2 hours
B. 4 hours
C. 8 hours
D. 16 hours
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111. # Amalgam achieves 70% of the strength by:
A. 2 hours
B. 4 hours
C. 8 hours
D. 16 hours
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112. # The solid solution of silver and mercury is called:
A. gamma 1
B. gamma 2
C. beta 1
D. gamma
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113. # The solid solution of silver and mercury is called:
A. gamma 1
B. gamma 2
C. beta 1
D. gamma
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114. # Mercury is toxic because it:
A. complexes hemoglobin to form methemoglobin
B. inhibits hemoglobin synthesis, producing anemia
C. inhibits aerobic glycolysis
D. binds to sulfhydryl groups
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115. # Mercury is toxic because it:
A. complexes hemoglobin to form methemoglobin
B. inhibits hemoglobin synthesis, producing anemia
C. inhibits aerobic glycolysis
D. binds to sulfhydryl groups
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116. # Once triturated, the dental amalgam should be condensed
within:
A. 5 minutes
B. 6 minutes
C. 3 minutes
D. 15 minutes
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117. # Once triturated, the dental amalgam should be condensed
within:
A. 5 minutes
B. 6 minutes
C. 3 minutes
D. 15 minutes
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118. # What fraction of inhaled mercury vapors is retained in the
body?
A. 45-55%
B. 55-65%
C. 65-85%
D. More than 85%
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119. # What fraction of inhaled mercury vapors is retained in the
body?
A. 45-55%
B. 55-65%
C. 65-85%
D. More than 85%
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120. # High strength amalgam is achieved by:
A. Maximum matrix and minimum alloy phase
B. Minimum matrix and maximum alloy phase
C. Maximum matrix phase
D. Minimum alloy phase
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121. # High strength amalgam is achieved by:
A. Maximum matrix and minimum alloy phase
B. Minimum matrix and maximum alloy phase
C. Maximum matrix phase
D. Minimum alloy phase
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122. # The effect of trituration on strength in an amalgam
restoration depends on:
A. Amalgam alloy
B. Trituration time
C. Speed of amalgamator
D. All of the above
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123. # The effect of trituration on strength in an amalgam
restoration depends on:
A. Amalgam alloy
B. Trituration time
C. Speed of amalgamator
D. All of the above
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124. # Which of the following does not occur in high copper
amalgam ?
A. Electrochemical corrosion
B. Chemical corrosion
C. Penetrating corrosion
D. Corrosion does not occur at all
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125. # Which of the following does not occur in high copper
amalgam ?
A. Electrochemical corrosion
B. Chemical corrosion
C. Penetrating corrosion
D. Corrosion does not occur at all
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126. # Decrease in creep occurs in:
A. Under trituration or over trituration of amalgam
B. Decrease with condensation pressure
C. Increase with condensation pressure
D. Cannot be predictable
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127. # Decrease in creep occurs in:
A. Under trituration or over trituration of amalgam
B. Decrease with condensation pressure
C. Increase with condensation pressure
D. Cannot be predictable
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128. # For dental amalgam, the elastic modulus and tensile
strength is:
A. 40 Gpa and 60-100 Mpa
B. 21 Gpa and 27-55 Mpa
C. 350 Gpa and 10-120 Mpa
D. 360 Gpa and 125-130 Mpa
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129. # For dental amalgam, the elastic modulus and tensile
strength is:
A. 40 Gpa and 60-100 Mpa
B. 21 Gpa and 27-55 Mpa
C. 350 Gpa and 10-120 Mpa
D. 360 Gpa and 125-130 Mpa
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130. # Cavo surface angle for amalgam restoration is butt joint as:
A. it increases compressive and tensile strengths
B. it decreases compressive and increases tensile strength
C. it decreases both compressive and tensile strength
D. it increases compressive and decreases tensile strength
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131. # Cavo surface angle for amalgam restoration is butt joint as:
A. it increases compressive and tensile strengths
B. it decreases compressive and increases tensile strength
C. it decreases both compressive and tensile strength
D. it increases compressive and decreases tensile strength
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132. # Adequate mixing of mercury is indicated by :
A. Dry mix
B. Shiny mix
C. Short mixing time
D. None
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133. # Adequate mixing of mercury is indicated by :
A. Dry mix
B. Shiny mix
C. Short mixing time
D. None
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134. # Which of the following are characteristic feature of high
copper amalgam alloy?
A. Low compressive strength
B. High marginal breakdown
C. Less marginal breakdown
D. High creep
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135. # Which of the following are characteristic feature of high
copper amalgam alloy?
A. Low compressive strength
B. High marginal breakdown
C. Less marginal breakdown
D. High creep
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136. # Which is true regarding lathe cut silver alloy?
A. Requires least amount of mercury
B. Achieves lowest compressive strength at 1 hour
C. Has tensile strength both at 15 min and 7 days comparable
to high copper unicompositional alloy
D. has low creep
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137. # Which is true regarding lathe cut silver alloy?
A. Requires least amount of mercury
B. Achieves lowest compressive strength at 1 hour
C. Has tensile strength both at 15 min and 7 days comparable
to high copper unicompositional alloy
D. has low creep
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138. # Coefficient of thermal expansion of amalgam is :
A. 6.6 ppm/K
B. 11.4 ppm/K
C. 14.0 ppm/K
D. 25.0 ppm/K
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139. # Coefficient of thermal expansion of amalgam is :
A. 6.6 ppm/K
B. 11.4 ppm/K
C. 14.0 ppm/K
D. 25.0 ppm/K
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140. # Gallium and Indium added to amalgam replace:
A. Silver
B. Tin
C. Mercury
D. Zinc
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141. # Gallium and Indium added to amalgam replace:
A. Silver
B. Tin
C. Mercury
D. Zinc
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142. # A patient who has had a recent amalgam filling in the
upper teeth has a gold filling in the lower teeth, the patient
complains of pain. The reason for this can be mainly:
A. Improper amalgam filling
B. Pulp exposure
C. Galvanism
D. None of the above
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143. # A patient who has had a recent amalgam filling in the
upper teeth has a gold filling in the lower teeth, the patient
complains of pain. The reason for this can be mainly:
A. Improper amalgam filling
B. Pulp exposure
C. Galvanism
D. None of the above
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144. # Which one of the following is not an objective of
trituration?
A. Remove oxides from powder particle surface
B. Keep the amount of gamma 1 or gamma 2 matrix crystals
to maximum
C. Pulverize pellets into particles to aid in attack by mercury
D. Achieve a workable mass of amalgam in minimum time
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145. # Which one of the following is not an objective of
trituration?
A. Remove oxides from powder particle surface
B. Keep the amount of gamma 1 or gamma 2 matrix crystals
to maximum
C. Pulverize pellets into particles to aid in attack by mercury
D. Achieve a workable mass of amalgam in minimum time
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146. # Outstanding clinical performance of dental amalgam
restoration is related to its:
A. Compressive strength
B. Tensile strength
C. Corrosion resistance
D. High Creep
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147. # Outstanding clinical performance of dental amalgam
restoration is related to its:
A. Compressive strength
B. Tensile strength
C. Corrosion resistance
D. High Creep
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148. # Eames technique is otherwise known as:
A. No squeeze cloth technique
B. Increasing dryness technique
C. Blotting mix
D. Mortar and pestle mix
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149. # Eames technique is otherwise known as:
A. No squeeze cloth technique
B. Increasing dryness technique
C. Blotting mix
D. Mortar and pestle mix
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150. # Discoloration of Ag containing alloy is due to : (Two
answers correct)
A. Wet corrosion
B. Dry corrosion
C. Tarnish
D. Both Tarnish and corrosion
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151. # Discoloration of Ag containing alloy is due to : (Two
answers correct)
A. Wet corrosion
B. Dry corrosion
C. Tarnish
D. Both Tarnish and corrosion
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