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25 Cards in this Set
- Front
- Back
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Temporary cements are used when the dentist:
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will need to remove the indirect restoration at a later time
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A delay between the final mix and the actual seating of the restoration could result in _____ and the possibility of the casting not fitting completely.
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an initial setting process
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What is the cement that gives off an exothermic reaction and must be spatulated over a wide area of a cool, dry, thick glass slab?
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zinc phosphate
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The dental assistant may have the responsibility of placing the mixed cement into the casting. The cement should be loaded:
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so that a thin lining covers all internal walls of the casting
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Polycarboxylate cement:
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is less irritating to the pulp than zinc phosphate cement
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Type __ glass ionomer cement is designed for restoring areas of erosion near the gingiva.
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Type II
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Which type of cement is preferred for cementation of ceramic veneers?
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composite resin
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What cement is frequently used for cementing provisional coverage?
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Type I
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When removing cement from a casting, never:
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pull excess down away from the casting
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Before cementing a porcelain crown, the internal surface of the crown is:
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roughened with air abrasion
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Who takes the final impression?
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dentist
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An impression tray should be sufficiently deep to allow ____ mm of material between the tray and the incisal or occlusal edges of the teeth.
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2 to 3 mm
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Custom impression trays:
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may be constructed from resin
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What is the irreversible hydrocolloid material used most widely for preliminary impression?
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Alginate
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Most alginate impressions must be poured within ____ so that distortion does not occur.
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1 hour
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If an alginate impression is stored in water or in a soaked paper towel, the alginate will absorb the additional water and expand. What is this property called?
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imbibition
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Which type of elastomeric material has the highest viscosity?
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putty
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What is used to mix elastomeric impression materials?
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D. both a&d ( a paper pad and spatula/ an automix system)
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How should alginate impressions be removed from the mouth?
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by using one quick, snap-out motion
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The _____portion of the maxillary tray should be seated in the mouth first.
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posterior
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Which is an advantage of an automix unit system for impressions?
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D. All of these are advantages (no mixing saves materials, it increases productivity, less time is spent on infection control.) |
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What is one of the most popular impression materials used for bite registration?
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Zinc oxide-eugenol (ZOE)
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If a more durable impression material is needed for bite registration, ______may be selected.
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Zinc oxide-eugenol (ZOE)
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The provisional should be lined with ZOE cement when being placed for temporary coverage.
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False
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If used as a base zinc phosphate requires the use of a liner first.
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True
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