Dental Materials MCQs

Page No. 3

Which phase provides maximum strength in hardened mercury/silver alloy ?


aSilver / Mercury phase

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bSilver / Tin phase

✓


cTin / Mercury phase

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dZinc / Mercury phase

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View Answer Silver / Tin phase

The tarnished layer of silver amalgam consists of________________?


aSulphides of silver

✓


bOxides of tin

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cChlorides of tin

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dAll of the above

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View Answer Sulphides of silver

The threshold limit value of mercury exposures is_______________?


a0.02 mg / m3

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b0.05 mg / m3

✓


c0.01 mg / m3

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d0.5 mg / m3

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View Answer 0.05 mg / m3

Mercury intoxication in dental office mainly results from____________?


aDirect contact with the mercury

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bInhalation of mercury vapours

✓


cIngestion of mercury

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dNone of the above

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Over-trituration of silver alloy and mercury_______________?


aReduces contraction

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bIncreases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgam

✓


cDecreases creep

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dGives al dull and crumbly amalgam

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Mercury rich condition in a slow setting amalgam alloy system in a resoration in______________?


aAccelerated corrosion

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bFracture of the restoration

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cMerginal damage

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dAll of the above

✓


View Answer All of the above

Advantage of minimum mercury technique or Eames technique is all Except________________?


aHigh strength

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bSets quickly

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cNeeds no squeezing of excess mercury

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dGreater plasticity and adapts well to cavity walls

✓



The solid solution of silver and mercury is called_______________?


ay1

✓


by2

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cB1

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dy

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View Answer y1

Once triturated, the Dental amalgam should be condensed with in_____________?


a6 minutes

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b5 minutes

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c3 minutes

✓


d15 minutes

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View Answer 3 minutes

High strength amalgam is achieved by_____________?


aMaximum matrix and minimum alloy phase

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bMinimum matrix and maximum alloy phase

✓


cMaximum matrix phase

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dMinimum alloy phase

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