Compilation of Quizzes Flashcards by M E

A dental impression is a/an _____ reproduction of the teeth.

a. negative

b. positive

c. approximate

d. distorted

a. negative

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Exposure to chemicals over a prolonged period of time is _____ exposure.

a. latent

b. chronic

c. acute

b. chronic

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When should impressions be disinfected?

a. For an hour before pouring in gypsum

b. At the dental lab check-in

c. At the chairside upon removal

d. Before rinsing with water

c. At the chairside upon removal

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How are large splatter particulates classified?

a. Larger than 50 microns

b. Larger than 30 microns

c. Smaller than 50 microns

d. Smaller than 30 microns

a. Larger than 50 microns

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What would a mercury spill kit include?

a. Absorbent powder

b. A special brush

c. Vinyl gloves

d. 2 × 2 gauze

a. Absorbent powder

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What is occurring when an alginate impression appears to sweat, showing droplets on the surface?

a. Imbibition

b. Dehydration

c. Hysteresis

d. Syneresis

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Staff training for a hazard communication program is required once _____ for all continuing employees.

a. a year

b. a month

c. every 5 years

d. every 3 years

a. a year

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Which of the following are considered to be personal protective equipment (PPE)?

a. Protective shields on model trimmers and on collection bins for lathes

b. Dust or surgical masks, eyewear, gowns, and hair coverings or tiebacks when appropriate

c. Plastic wraps and covers

d. Surface and immersion disinfectants

b. Dust or surgical masks, eyewear, gowns, and hair coverings or tiebacks when appropriate

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Which of the following is the most widely used dental impression material?

a. Irreversible hydrocolloid

b. Condensation silicone impression material

c. Reversible hydrocolloid

d. Addition of silicone impression material

a. Irreversible hydrocolloid

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A substance is defined as being corrosive if the pH is less than _____ or greater than 12.5.

a. 5.0

b. 2.0

c. 7.0

d. 1.0

b. 2.0

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Which statement is correct regarding alginate hydrocolloid?

a. Some moisture will be lost from the impression even in 100% humidity.

b. Alginate hydrocolloid should be removed slowly to prevent deformation of critical surfaces.

c. Fast-set alginate has a working time of 2 to 3 minutes.

d. Adjusting the powder-to-water ratio is the best way to lengthen or shorten the setting time.

a. Some moisture will be lost from the impression even in 100% humidity.

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Which of the following statements is true regarding hand protection when handling chemicals?

a. It is impossible to develop a reaction to the latex products of gloves.

b. Nitrile gloves are not recommended for wear when handling chemicals.

c. When exposed to chemical disinfectants, the latex in gloves degrades and can actually pull contaminants and chemicals through the gloves and onto the hands.

d. Latex gloves worn during patient care provide adequate protection for handling chemicals.

c. When exposed to chemical disinfectants, the latex in gloves degrades and can actually pull contaminants and chemicals through the gloves and onto the hands.

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Impressions taken with polyvinyl siloxane should be poured within:

a. 30 minutes.

b. 1 week.

c. 1 day.

d. 1 hour.

b. 1 week.

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What could occur if a cast is made from an improperly disinfected impression?

a. Will not harbor microorganisms

b. Cannot be disinfected, so start over

c. Should be stored for 24 hours first

d. Should be immersed in solution

c. Should be stored for 24 hours first

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Acute chemical toxicity results from _____ levels of exposure over a _____ period of time.

a. low; long

b. low; short

c. high; long

d. high; short

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The completed impression forms a _____ reproduction of the teeth and tissues, and the replica or model forms a _____ replica of the teeth and tissues.

a. negative; negative

b. negative; positive

c. positive; negative

d. positive; positive

b. negative; positive

Through which medium is dust generated and inhaled?

a. Particulate matter

b. Infectious waste

c. Bio-aerosol

d. Living mist

a. Particulate matter

Chemical-resistant gloves are necessary when working with chemicals. Of the following, which would be chemical resistant?

a. Nitrile

b. Latex

c. Vinyl

a. Nitrile

Which of the following elastomers are the most hydrophilic?

a. Polysulfides

b. Addition silicones

c. Polyethers

d. Condensation silicones

c. Polyethers

Which of the following is true of vinyl polyether silicone?

a. It is available in three viscosities: light, monophase, and heavy.

b. It is hydrophobic.

c. It can tolerate a little moisture around the preparation.

d. It flows well but has low tear strength.

c. It can tolerate a little moisture around the preparation.

A basic “safe” policy for the storage of dental medications and chemicals is to keep them in a _____, dark place where they are not exposed to direct sunlight.

a. dry, cool

b. wet, cool

c. wet, warm

d. dry, warm

a. dry, cool

What could occur if a cast is made from an improperly disinfected impression?

a. Will not harbor microorganisms

b. Cannot be disinfected, so start over

c. Should be stored for 24 hours first

d. Should be immersed in solution

c. Should be stored for 24 hours first

Of the items listed, which would not be made from an alginate impression?

a. Mouth guard

b. Onlay

c. Retainer

d. Bleaching tray

b. Onlay

A hazardous chemical is any substance that what?

Can catch fire
Can react or explode when mixed with other substances
Is corrosive or toxic
May cause infection or disease

a. 2, 3, 4

b. 1, 2, 3

c. 1, 2, 3, 4

d. 1, 3

b. 1, 2, 3

Which of the following is an elastic impression material? a. Impression plaster b. Dental impression compound c. Impression wax d. Vinyl polyether silicone

d. Vinyl polyether silicone

Which of the following is true for hydrocolloids in dentistry? a. Agar hydrocolloid is a reversible hydrocolloid. b. When agar powder is mixed with water, it forms a gluelike suspension that entraps the water, making a colloidal suspension called a gel. c. Agar hydrocolloid requires the use of custom impression trays. d. The main clinical use of reversible hydrocolloid is for impressions for diagnostic casts.

a. Agar hydrocolloid is a reversible hydrocolloid.

Which particulates are smaller than 5 microns? a. Dust b. Mold c. Aerosols d. Splatter

c. Aerosols

Mixed alginate should be loaded into the impression tray in _____ increments as _____ as possible. a. large; slowly b. small; slowly c. large; quickly d. small; quickly

c. large; quickly

Why would a dentist choose to use an addition silicone over a condensation silicone? a. Addition does not distort as badly. b. Addition tastes better. c. Addition is cleaner to use. d. Addition is stronger than condensation.

a. Addition does not distort as badly.

Who has the responsibility of assessing hazardous chemicals and then passing the information to consumers? a. Organization for Safety and Asepsis Procedures b. Chemical manufacturers c. Occupational Safety and Health Administration d. Centers for Disease Control and Prevention

b. Chemical manufacturers

For a maxillary alginate impression, the operator stands just _____ the patient at the _____ o’clock position and retracts the corner of the mouth with the side of the tray while retracting the other corner of the mouth with the index finger of the other hand. a. behind; 1 b. in front of; 7 c. in front of; 5 d. behind; 11

d. behind; 11

Which characteristic should be considered when choosing an impression tray? a. Accurately reproduce vestibules b. Be rigid to support the impression material c. All of the above are considered. d. Be large enough to fit all oral structures

c. All of the above are considered.

Through which medium is dust generated and inhaled? a. Particulate matter b. Infectious waste c. Bio-aerosol d. Living mist

a. Particulate matter

Which of the following disinfectants are compatible with addition silicone impression materials? 1. 1:10 sodium hypochlorite 2. 1:213 iodophors 3. Glutaraldehydes 4. Complex phenolics a. 2, 3 b. 1, 2, 3, 4 c. 1, 2, 3 d. 2, 3, 4

b. 1, 2, 3, 4

Materials that are transferred from larger containers to smaller containers must be labeled using what? a. Either a or b b. A photo of the original label c. A specially made secondary label d. Secondary labeling is not necessary.

a. Either a or b

When preparing to take an alginate impression, which of the following is not necessary? a. Fluff the material to mix. b. Wear a mask and eyewear. c. Have patient use antibacterial rinse. d. Use a try-in tray for fit.

c. Have patient use antibacterial rinse.

Which of the following is recommended to help manage the patient’s airway during dental procedures? a. Using high-velocity evacuation (HVE) and a rubber dam whenever possible b. Having the patient sit up completely forward in the dental chair c. Frequently turning the patient’s head to the side during the procedure d. Having the patient use a pre-procedural mouth rinse

a. Using high-velocity evacuation (HVE) and a rubber dam whenever possible

What does SDS stand for? a. Serving Dental Systems b. System of Dental Services c. Safety Data Sheet d. Serving Dental Structures

c. Safety Data Sheet