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15 Cards in this Set
- Front
- Back
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The most accurate are made w/which type of trays
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Custom trays
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Which impression material is classified as an irreversible hydrocolloid?
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Alginate
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Which impression material is classified as a reversible colloid?
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Agar
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A_______is a positive replica of a single tooth.
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die
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______impressions require the use of a water bath and water cooled impression trays.
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Agar impressions
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Identify 4 impression materials that are classified as inelastic or rigid materials.
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Plaster, wax, impression compound, Zinc oxide eugenol (ZOE)
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Which impression material is supplied in two tubes of contrasting color, sets to a brittle solid and is identified easily by the odor of oil cloves
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Zinc Oxide Eugenol ZOE
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An impression gives a______reproduction of the oral tissues
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negative
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List two factors that will affect the mixing and setting times of alginate impression material?
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water temperature and water to powder ratio
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If an alginate impression is left in the mouth for a few extra minutes and the removal time is delayed, the strength of the elasticity will_________
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increase
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Alginate impressions should be stored in an atmosphere of 100% humidity for the shortest time possible
TRUE OR FALSE |
TRUE
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When seating an impression tray, which portion of the tray is usually seated first
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posterior
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_________is the characteristic of reversible hydrocolloids whereby they do not melt and gel at the same room temperature
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Hysteresis
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Warm water will cause an alginate impression to set up
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faster
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Which of the following instructions for mixing alginate impression material would be true:
A. pour water into powder B. mix gently at first to incorporate powder into water C.strop material against the side of the bowl for approximately one minute. D. all of the above |
all of the above
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