Impression Making and Diagnostic Cast Fabrication Quiz
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Questions and Answers

What can cause an irregularly shaped void in an alginate impression?

  • Improper mixing
  • Moisture or debris on tissue (correct)
  • Inadequate bulk
  • Undue gelation

    • Which rubber impression material has the longest setting time?

  • Addition silicone
  • Polysulfide rubber (correct)
  • Polyether
  • Condensation silicone

    • What can lead to the formation of a rough or chalky stone cast?

  • Inadequate cleaning of the impression
  • Excess water left on the impression
  • Improper manipulation of stone
  • All of the above (correct)

    • Which factor does NOT contribute to tearing in an alginate impression?

    <p>Prolonged mixing</p> Signup and view all the answers

    What causes a flat lingual area in an acceptable cast?

    <p>A land area of 2 to 3 mm</p> Signup and view all the answers

    How should a patient be prepared for impression making?

    <p>Informing about the procedure and mouth preparation</p> Signup and view all the answers

    What is the recommended patient position for an upper arch impression?

    <p>Patient seated in an upright position</p> Signup and view all the answers

    What is the dentist's position for taking a lower arch impression?

    <p>8 o'clock position, instructing patient to bring tongue up and forward</p> Signup and view all the answers

    What should be done immediately after taking the impression?

    <p>Rinsing the impression, disinfecting, and drying with air stream</p> Signup and view all the answers

    What are the qualities of a good impression?

    <p>Smooth surface and well-rounded borders</p> Signup and view all the answers

    How should a perforated rim lock tray be used?

    <p>Applying tray adhesive to secure it in place</p> Signup and view all the answers

    What are the properties of irreversible hydrocolloid (alginate) as mentioned in the text?

    <p>Accurate, easy to manipulate, does not require custom tray</p> Signup and view all the answers

    What is the composition of alginate as stated in the text?

    <p>Potassium alginate 15%, calcium sulfate 16%, zinc oxide 4%, potassium titanium fluoride 3%, diatomaceous earth 60%, sodium phosphate 2%</p> Signup and view all the answers

    What is the spatulation time for irreversible hydrocolloid (alginate) mentioned in the text?

    <p>45 seconds to 1 minute with a vigorous figure – 8 motion</p> Signup and view all the answers

    What does a good diagnostic work up involve as per the text?

    <p>Evaluate soft tissue contour and bony contour</p> Signup and view all the answers

    What is the gelation time for irreversible hydrocolloid (alginate) as mentioned in the text?

    <p>3-4 minutes</p> Signup and view all the answers

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