Wilkins Chapter 7 Multiple Choices

Which of the following is applied before injection of an anesthetic to decrease the risk of introducing septic material into the soft tissue?

A) disinfectant

B) An antiseptic

C) A surfactant

D) A phenol

B) An antiseptic

For dry heat sterilization which biological monitor should be used to determine effective sterilization?

A) Bacillus atrophaeus

B) Geobacillus stearothermophillus

C) Lactobacillus atromophillus

A) Bacillus atrophaeus

Which of the following statements is correct about proper maintenance of unit water lines?

A) Flushing for 2 minutes at the beginning of the day, and 30 seconds both before and after each patient

B) Flushing for 3 minutes at the beginning of the day, and 20 seconds both before and after each patient

C) Flushing for 5 minutes at the beginning of the day, and 30 seconds both before and after each patient

D) Flushing for 2 minutes at the beginning of the day, and 1 minute both before and after each patient

A) Flushing for 2 minutes at the beginning of the day, and 30 seconds both before and after each patient

The dental chair should have a seat that __________.

A) is made of leather

B) has a plastic finish

C) has soft cloth upholstery

D) is made of smooth, seamless wood

B) has a plastic finish

What temperature must a gravity displacement autoclave reach in order to sterilize properly?

A) 250°F (121°C)

B) 270°F (132°C)

C) 320°F (160°C)

D) 350°F (177°C)

A) 250°F (121°C)

A(n) _____________________ is any substance that kills or suppresses the growth of microorganisms.

A) Antimicrobial agent

B) Sporicidal

C) Disinfectant

D) Biofilm

A) Antimicrobial agent

Ultrasonic processing is a cleaning process.

A) True

B) False

A) True

Of the following methods of sterilization, which one usually requires the shortest cycle?

A) Dry heat oven

B) Chemical vapor

C) Steam under pressure

D) All require the same amount of time

C) Steam under pressure

A dry heat oven requires 120 minutes. Steam under pressure/autoclave requires 15 to 30 minutes. Chemical vapor requires 20 minutes.

A chemical vapor sterilizer should be tested weekly with indicator strips containing:

A) Geobacillus stearothermophilus

B) Bacillus atrophaeus

C) Lactobacillus acidophilus

D) Bacillus subtilis

A) Geobacillus stearothermophilus

Chemical sterilization is best suited for which of the following?

A) Heat sensitive handpieces

B) Liquids

C) Metals

D) Plastics

C) Metals

_________________ is the process by which all forms of life, including bacterial spores, are destroyed by physical or chemical means.

A) Antiseptic

B) Sanitation

C) Contamination

D) Sterilization

D) Sterilization

Corrosion of carbon steel instruments may occur if caution is not used with which sterilization method?

A) Chemical vapor

B) Dry heat

C) Steam under pressure

D) All methods are safe for use with carbon steel instruments.

C) Steam under pressure

The biological monitor Geobacillus stearothermophillus is used to determine effective sterilization by ________ sterilizers.

A) steam autoclave and chemical vapor

B) chemical vapor and dry heat

C) dry heat and steam autoclave

A) steam autoclave and chemical vapor

Radiographic biteblocks are classified into which category for disinfection/sterilization?

A) Critical

B) Semi-critical

C) Noncritical

D) Environmental

B) Semi-critical

Sterile wrapped instruments should be unwrapped and set up on the bracket tray prior to patient seating.

A) True

B) False

B) False

The government agency that regulates food, drugs, biologic products, medical devices, and radiologic products is the ______.

A) EPA

B) FDA

C) OSHA

D) PPE

B) FDA

Which of the following is the correct temperature for unsaturated chemical vapor to achieve sterilization?

A) 270°F (132°C)

B) 320°F (160°C)

C) 220°F (104°C)

D) 350°F (177°C)

A) 270°F (132°C)

For manual scrubbing you should use all except one of the following. Which is NOT recommended?

A) Color coded brushes

B) Face mask

C) Heavy duty gloves

D) Isopropyl alcohol

E) Protective eyewear

D) Isopropyl alcohol

Preprocedural rinsing with an antimicrobial mouthwash is an oral hygiene measure recommended to prevent disease transmission. Which of the following is recommended in the chapter?

A) 0.2% chlorhexidine rinse

B) 20% chlorhexidine rinse

C) 0.2% phenol rinse

D) 20% phenol rinse

A) 0.2% chlorhexidine rinse

The substantivity of 0.2% chlorhexidine provides a lowered bacterial count for more than 60 minutes.

Which of the following is not an advantage of using the chemical vapor sterilizer?

A) Ability to sterilize in a relatively short total cycle

B) Corrosion and rust-free operation for carbon steel instruments

C) Ease of operation and care of the equipment

D) Completely odorless

D) Completely odorless

It has a slight odor

Bacillus atrophaeus strips are used to check sterility in dry heat ovens.

A) True

B) False

A) True

How long should water lines be flushed to reduce microbial counts after each patient appointment?

A) 30 seconds

B) 1 minute

C) 2 minutes

D) 3 minutes

A) 30 seconds

Into which disinfection/sterilization category would you place curets?

A) Critical

B) Semi-critical

C) Noncritical

D) Environmental

A) Critical

Items which penetrate soft tissue or bone are critical.

The life expectancy of a solution once it has been activated is called the __________ life.

A) shelf

B) disinfection

C) activation

D) reuse

E) use

E) use

Which of the following is not a criterion for the selection of an ideal disinfectant?

A) Nontoxic

B) Will not corrode instruments

C) Odorless

D) Economical

E) Inactive in the presence of organic matter

E) Inactive in the presence of organic matter

Of the following methods of sterilization, ____________ requires the longest cycle.

A) chemical vapor

B) dry heat oven

C) steam under pressure

D) All require the same time.

B) dry heat oven

Probes fall into which category for sterilization/disinfection?

A) Critical

B) Semi-critical

C) Noncritical

D) Environmental

A) Critical

On the universal label for hazardous material, the hazard warning label is __________ with lettering or a symbol in a contrasting color.

A) Black

B) Blue

C) Green

D) Orange

D) Orange

Which sterilization technique requires a long exposure time and involves slow, uneven penetration?

A) Chemical vapor

B) Dry heat

C) Steam under pressure

B) Dry heat

What is the recommended temperature for sterilization when using a prevacuum autoclave?

A) 250°F (121°C)

B) 270°F (132°C)

C) 320°F (160°C)

D) 350°F (177°C)

B) 270°F (132°C)

Which statement is false?

A) The action of dry heat is oxidation.

B) Chemical vapor sterilization can be safely used with carbon steel instruments.

C) Refilling of the chemical vapor sterilizer is needed every 5-10 cycles.

D) Properly wrapped and sterilized instruments may remain sterile for several months to 1 year.

C) Refilling of the chemical vapor sterilizer is needed every 5-10 cycles.

Refilling of chemical vapor sterilizer is needed every 30 cycles not 5-10.

Sterile instruments kept in which of the following will remain sterile longer?

A) Wrapped and sealed paper cover

B) Plastic or nylon wrapped with tape

C) A metal cassette closed but not wrapped and sealed

D) A tub without a lid

B) Plastic or nylon wrapped with tape

True or False. A household dishwasher can take the place of an instrument washer/thermal disinfector.

A) True

B) False

B) False

All except one of the following statements about instrument disinfection are true. Which statement is NOT true?

A) The use of ultrasonic cleaning increases efficiency over manual scrubbing in obtaining a high degree of cleanliness.

B) A benefit from using a washer/thermal disinfector and ultrasonic cleaning over manual scrubbing is elimination of possible dissemination of microorganisms through release of aerosols and droplets, which can occur during the scrubbing process.

C) A household dishwasher can take the place of an instrument washer/thermal disinfector.

D) Disinfection allows the instruments in cassettes to be handled with gloves while packaging.

E) At the end of the ultrasonic procedure, instruments must be air dried.

C) A household dishwasher can take the place of an instrument washer/thermal disinfector.

Mouth mirrors fall into which category for sterilization/disinfection?

A) Critical

B) Semi-critical

C) Noncritical

D) Environmental

C) Noncritical

Examples of semi-critical items include mouth mirrors and impression trays.

Disinfectants that inactivate all forms all microorganisms but do not destroy spores are considered what type of disinfectant?

A) High-level disinfectant

B) Intermediate-level disinfectant

C) Antiseptic disinfectant

D) Sporicidal disinfectant

E) Low-level disinfectant

F) None of these

B) Intermediate-level disinfectant

When should routine spore testing of an autoclave should be done?

A) Once a month

B) Once a week

C) Once a day

D) After each use

B) Once a week

The MSDS for a chemical disinfectant must contain information for all of the following EXCEPT __________.

A) shelf life

B) use life

C) reuse life

D) product cost

D) product cost

Ultrasonic processing is a sterilization process.

A) True

B) False

B) False

Ultrasonic processing is not a substitute for sterilization; it is only a cleaning process.

The stability of an item after it has been prepared is called __________.

A) sanitation

B) chain of asepsis

C) shelf life

D) biofilm

C) shelf life

After treating an HIV patient, what is the appropriate protocol for handling the instruments used?

A) Soak in sodium hypochlorite and then sterilize as usual

B) Sterilize for 10 minutes longer than the usual sterilization time

C) Sterilize using the usual method used for other patients

D) Place in double bags to avoid contamination of other instruments

C) Sterilize using the usual method used for other patients

Incomplete autoclave sterilization can result from problems with which of the following:

A) Inadequate maintenance

B) Overloading

C) Improper packaging

D) All of these

D) All of these

Which of the following sterilization techniques is the most economical?

A) Chemical vapor

B) Dry heat

C) Steam under pressure

D) All are the approximately the same cost

C) Steam under pressure