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Impression Making and Diagnostic Cast Fabrication Quiz

16 Questions

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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?

Prolonged mixing Signup and view all the answers

What causes a flat lingual area in an acceptable cast?

A land area of 2 to 3 mm Signup and view all the answers

How should a patient be prepared for impression making?

Informing about the procedure and mouth preparation Signup and view all the answers

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

Patient seated in an upright position Signup and view all the answers

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

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

What should be done immediately after taking the impression?

Rinsing the impression, disinfecting, and drying with air stream Signup and view all the answers

What are the qualities of a good impression?

Smooth surface and well-rounded borders Signup and view all the answers

How should a perforated rim lock tray be used?

Applying tray adhesive to secure it in place Signup and view all the answers

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

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

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

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

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

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

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

Evaluate soft tissue contour and bony contour Signup and view all the answers

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

3-4 minutes Signup and view all the answers