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

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Through which medium is dust generated and inhaled?

a. Particulate matter

b. Infectious waste

c. Bio-aerosol

d. Living mist

a. Particulate matter

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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

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Which of the following elastomers are the most hydrophilic?

a. Polysulfides

b. Addition silicones

c. Polyethers

d. Condensation silicones

c. Polyethers

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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.

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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

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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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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

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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

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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

Which of the following is true for control of a mercury spill? a. The spill kit for small amounts of mercury should contain a handheld vacuum cleaner. b. Mercury can be absorbed through the skin, but as a metal it is very dense, and there is no risk of inhalation of mercury vapors. c. A mask and utility-type gloves should be worn whenever cleaning a mercury spill. d. Mercury spill kits are required only for offices that use free rather than precapsulated mercury; thus mercury spill kits do not have to be available in all dental offices that use amalgam for restorations.

c. A mask and utility-type gloves should be worn whenever cleaning a mercury spill.

Which of the following is not a classification of dental materials? a. Preventive b. Biological c. Therapeutic d. Restorative

b. Biological

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

c. Safety Data Sheet

Some materials give off heat when mixed. What is this called? a. Thermal conductivity b. Chemical reaction c. Exothermic reaction d. Coefficient of thermal expansion

c. Exothermic reaction

Which term describes the thicker or thinner a material is? a. Thixotropic b. Viscosity c. Flowability d. Density

b. Viscosity

Cross-contamination from dental materials can be kept to a minimum by doing what? a. Using universal precautions b. Both are correct. c. Following bloodborne pathogen recommendations

b. Both are correct.

Which of the following is true of galvanism? a. It is an electrical current transmitted between two similar metals. b. Galvanic stimulation will decrease with time as oxides form on the surface of the metal. c. The salts of the saliva inhibit the movement of electrical current from one type of metal to another. d. It is observed in patients with composite resin but not silver amalgam restorations.

b. Galvanic stimulation will decrease with time as oxides form on the surface of the metal.

The staining of resins and acrylics from repeated exposure to coffee, tea, and other dyed beverages is due to: a. galvanism. b. compressive forces. c. tarnish. d. water sorption.

d. water sorption.

Torque is a combination of which forces? a. Shearing and tensile b. Compressive and torsion c. Compressive and tensile d. Shearing and compressive

c. Compressive and tensile

In history, the earliest recorded mention of restorative dentistry occurs when? a. 2500 BC b. 1200 AD c. 1700 AD d. 600 BC

d. 600 BC

What is percolation? a. The rate at which heat flows through a material b. Something that helps seal the interface between tooth and restorative material c. Something that allows the ingress of bacteria and oral fluids and may lead to recurrent caries, staining, and pulpal irritation d. A form of chemical rather than mechanical retention

c. Something that allows the ingress of bacteria and oral fluids and may lead to recurrent caries, staining, and pulpal irritation

How are large splatter particulates classified? a. Larger than 50 microns b. Larger than 30 microns c. Smaller than 30 microns d. Smaller than 50 microns

a. Larger than 50 microns

Who provides SDSs? a. The doctor b. The manufacturer c. The dental supply house d. OSHA

b. The manufacturer

What is Dr. Frederick McKay credited with? a. Noting dental fluorosis in Colorado Springs b. Demonstrating a casting method to produce gold inlays c. Developing an acceptable formula for silver dental amalgam d. The introduction of dental cements

a. Noting dental fluorosis in Colorado Springs

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. 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. d. 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.

Stress is the amount of force exerted from within an object, and _____ is the amount of change that the force has produced. a. strain b. tension c. compression d. chemical bonding

a. strain

Which of the following represents the standards used to develop specifications and testing on an international level? a. American Dental Association (ADA) b. Food and Drug Administration (FDA) c. World Health Organization (WHO) d. International Standards Organization (ISO)

d. International Standards Organization (ISO)

What causes microleakage? a. A poorly placed restoration b. Expansion and contraction of a restoration c. A fracture within a restoration d. All of the above could cause microleakage.

d. All of the above could cause microleakage.

Which of the following restorative materials has a coefficient of thermal expansion and thermal conductivity closest to enamel? a. Porcelain b. Composite resin c. Gold d. Amalgam

a. Porcelain

Silver paste was first mentioned as a restorative material for teeth by the: a. Chinese. b. Greeks. c. French. d. Romans.

a. Chinese.

If a staff member is splashed in the face with a caustic chemical and some goes into the eye, what should he or she do? a. Wash eyes with soap and water. b. Flush eyes at the eye wash station. c. Wipe eyes with a damp cloth. d. Shower immediately.

b. Flush eyes at the eye wash station.

Since 2005, the American Dental Association (ADA) Seal of Acceptance is awarded to _____ products. a. both professional and consumer b. neither professional nor consumer c. consumer but not professional d. professional but not consumer

c. consumer but not professional

Of the following phrases, which is not associated with employee training practices? a. When a new employee is hired b. Once a year for all continuing employees c. When scheduled by the manufacturer’s representative d. When a new chemical product is added

c. When scheduled by the manufacturer’s representative

Which of the following statements is true regarding hand protection when handling chemicals? a. Latex gloves worn during patient care provide adequate protection for handling chemicals. b. When exposed to chemical disinfectants, the latex in gloves degrades and can actually pull contaminants and chemicals through the gloves and onto the hands. c. Nitrile gloves are not recommended for wear when handling chemicals. d. It is impossible to develop a reaction to the latex products of gloves.

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

_____ force is applied when two surfaces slide against each other in opposite directions. a. Shearing b. Compressive c. Axial d. Tensile

a. Shearing

When an object cannot resist force, _____ occurs. a. deformation b. distortion c. deformation or distortion

c. deformation or distortion

What is the purpose of the Safety Data Sheets (SDSs)? a. Provide information regarding the manufacturer b. Provide instructions in case of spill c. All of the above d. Provide instructions for product use

c. All of the above

The color range of a tooth is usually seen by the human eye as yellow or brown. What is this component classified as? a. Chroma b. Value c. Hue

c. Hue

Which of the following is essential to prevent severe injury if phosphoric, hydrofluoric, or hydrochloric acid is splashed on the skin, eyes, or clothing during manipulation of various dental materials? a. Use of a National Institute of Occupational Safety and Health (NIOSH)-approved dust and mist respirator facemask b. Placing an ointment and a bandage over the affected area c. Calling 911 d. Flushing with water

d. Flushing with water

Which of the following is not a concern regarding identification of dental materials in the mouth? a. Both are concerns when materials are identified. b. Therapeutic agents could erode some materials. c. Scaling could damage the surfaces of some materials.

a. Both are concerns when materials are identified.

Which of the following is considered to be the most reliable means of clinical assessment of composite and glass ionomer restorations? a. The patient history b. Use of the air-water syringe c. Evaluation of radiographs d. Tactile evaluation of the tooth surface

d. Tactile evaluation of the tooth surface

In history, the earliest recorded mention of restorative dentistry occurs when? a. 1200 AD b. 2500 BC c. 1700 AD d. 600 BC

d. 600 BC

Dental materials considered devices, as well as over-the-counter products sold to the public, are subject to control and regulation of the _____ Center for Devices and Radiological Health. a. Drug Enforcement Administration b. Department of Human and Health Services c. Food and Drug Administration d. Centers for Disease Control and Prevention

c. Food and Drug Administration

Most modern dental materials are made to be moisture resistant. a. False b. True

a. False

What causes microleakage? a. A fracture within a restoration b. All of the above could cause microleakage. c. A poorly placed restoration d. Expansion and contraction of a restoration

b. All of the above could cause microleakage.

Contact between two dissimilar metals in the mouth may result in what reaction? a. Metallic taste b. All of the above are possible. c. Galvanic shock d. Electrical current

b. All of the above are possible.

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

d. Chemical manufacturers

The first acceptable amalgam formula was developed by _____ in 1895. a. Dr. Frederick McKay b. Dr. William Taggart c. G.V. Black d. Pierre Fuchard

c. G.V. Black

Adhesion is the method of _____ retention. a. mechanical b. dual c. chemical

c. chemical

Wax patterns should be invested within _____ of carving. a. minutes b. hours c. days d. weeks

a. minutes

What is the possible outcome of repeated low-level exposure to the blue curing light? a. Cataract b. Blindness c. Detached retina d. Macular degeneration

d. Macular degeneration

An increase in spatulation time and rate will _____ the setting time and _____ the rate of setting expansion. a. lengthen; increase b. lengthen; decrease c. shorten; increase d. shorten; decrease

c. shorten; increase

Sheets of baseplate wax are usually layered to: a. produce patterns for metal castings using the lost wax technique. b. construct the metal framework of partial and complete dentures. c. produce the form on which denture teeth are set. d. form the base portion of a gypsum model.

c. produce the form on which denture teeth are set.

What type of restorative material is used for the atraumatic restorative treatment (ART) of caries? a. Compomer b. Conventional composite resin c. Hybrid (resin-modified) ionomer d. High-viscosity glass ionomer composite

d. High-viscosity glass ionomer composite

Which of the following kinds of waxes is used to adhere components of metal, gypsum, or resin together temporarily during fabrication and repair? a. Inlay wax b. Sticky wax c. Boxing wax d. Corrective impression wax

b. Sticky wax

Which of the following are advantages of laboratory-processed composite restorations over directly placed composites? 1. The restoration is denser. 2. The restoration polymerizes more completely. 3. More stress is created internally on the composite and the walls of the cavity preparation. a. 1, 2, 3 b. 1, 2 c. 1, 3 d. 2, 3

b. 1, 2

In the lost wax technique for casting gold for dental restorations, a _____ is attached to the pattern to form the channel into which the molten metal will be forced. a. die b. sprue c. casting d. crucible

b. sprue

The use of two different restorative materials in the same restoration is referred to as what? a. Veneer technique b. Hybrid technique c. Layered technique d. Sandwich technique

d. Sandwich technique

Which of the following composite resin materials would not be used in non–stress-bearing areas? a. Macrofilled b. Microfilled c. Microhybrid

a. Macrofilled

What is the recommended curing time for the proximal box of a class II composite restoration? a. 10 to 30 seconds b. 20 to 40 seconds c. 40 to 60 seconds d. 60 to 80 seconds

c. 40 to 60 seconds

Which of the following represents the correct sequence for creation of a casting using the lost wax technique? 1. The pattern and sprue are encased in an investment ring. 2. A wax or plastic sprue is attached to the pattern. 3. A wax pattern of the restoration is carved on the die. 4. The enclosed pattern and sprue are heated in a burnout oven at high temperatures. a. 3, 1, 2, 4 b. 3, 2, 1, 4 c. 2, 3, 1, 4 d. 3, 2, 4, 1

b. 3, 2, 1, 4

An increase in the recommended water-to-powder ratio will result in a _____ accurate model. a. stronger, more b. stronger, less c. weaker, more d. weaker, less

d. weaker, less

For composite restorative materials, the greater the filler content, the _____ the coefficient of thermal expansion (CTE), and the greater the resin content, the _____ the CTE. a. greater; greater b. greater; lower c. lower; greater d. lower; lower

c. lower; greater

The _____ the particles of gypsum powder are, the weaker and less resistant to abrasion is the final product. a. smaller, more irregular, and denser b. smaller, more regular, and more porous c. larger, more irregular, and more porous d. larger, more regular, and denser

c. larger, more irregular, and more porous

Which kind of wax is used to construct the metal framework of partial and complete dentures? a. Utility wax b. Boxing wax c. Casting wax d. Baseplate wax

c. Casting wax

What is the organic matrix of composite resins made up of? a. BIS-GMA b. Glass c. Silica d. Quartz

a. BIS-GMA

For regular-set gypsum products, the initial set occurs within _____ minutes from the beginning of the mix. a. 1 to 2 b. 3 to 5 c. 8 to 16 d. 12 to 14

c. 8 to 16

Which part of the tooth is generally closest to the dentin in color? a. Body b. Cervical c. Incisal area of anterior teeth d. Occlusal area of posterior teeth

b. Cervical

Compilation of Quizzes Flashcards

(97 cards)