Dental Materials MCQs

Page No. 29

Alginates are made dust free by adding______________?


aGlycol

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bGlyecrol

✓


cGlutamic acid

✖


dAlcohol

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View Answer Glyecrol

The role of magnesium chloride in zinc oxide eugenol impression paste_________________?


aRetarder

✖


bModifier

✖


cAccelerator

✓


dPlasticizer

✖


View Answer Accelerator

To make the vinyl Polysiloxane hydrophilic the following is added_______________?


aMineral oil

✖


bSurfactant

✓


cWater

✖


dPlasticizer

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View Answer Surfactant

Dimensional stability of hydrocolloid impressions may be achieved by_________________?


aUsing less water powder ratio

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bStoring the impression under water

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cProlonged manipulation

✖


dUsing humidor

✓


View Answer Using humidor

Which of the following is correct regarding chemical setting of condensation silicone_______________?


aPolymerization occurs with repeated elimination of small molecules

✓


bPolymerization occurs with elimination of single byproduct

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cBy condensation of repeated molecules of monomers

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dCondensation does not occur at all

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Which of the following is used as surface hardener in Impression material ?


a2% Potassium sulfate

✓


b0.2% Potassium sulfate

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c2% Sodium sulfate

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d4% Potassium sulfate

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View Answer 2% Potassium sulfate

Which of the following best describes the working time of impression material ?


aAfter the start of appearing elastic properties of impression material

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bJust after the start of appearing elastic properties of impression material

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cThe time for start of mixing till just before the start of appearing elastic properties of impression material

✓


dLoss of lusture of impression material

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Which of the following is correct arrangement of impression material regarding linear contraction in ascending order ?


aAddition silicone < polyether < polysulfide < condensation silicone

✓


bAddition silicone < polysulfide < Polyether < condensation silicone

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ccondensation silicone < polyether < polysulfide < Addition silicone

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dcondensation silicone < polysulfide < polyether < Addition silicone

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Most flexible impression material______________?


aImpression compound

✓


bImpression paste

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cAddition silicone

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dAlginate

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View Answer Impression compound

A laminate impression technique utilizes_______________?


aSyringe agar and chilled tray alginate

✓


bSyringe agar and tray agar

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cSyringe agar and impression compound

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dChilled alginate and impression compound

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