Deck 16: Laboratory and Radiographic Asepsis

Question 1

Impressions that are sensitive to immersion should be rinsed, shaken to remove excess water, and then:

A)steam sterilized.
B)sprayed with a disinfectant and wrapped in a paper towel.
C)rinsed for 5 minutes with hot tap water.
D)boiled in water for 30 minutes.

Answer 1

sprayed with a disinfectant and wrapped in a paper towel.

Question 2

How should one decontaminate impressions that are distorted if submerged in a liquid?

A)Spray with a disinfectant and wrapped with a towel moistened with the same disinfectant.
B)Rinse under running tap water.
C)Process through a steam sterilizer.
D)Wrap in a towel saturated with a non-antimicrobial soap and rinsed.

Answer 2

Spray with a disinfectant and wrapped with a towel moistened with the same disinfectant.

Question 3

Although some x-ray film packets can be disinfected after removal from the patient's mouth, it is best to:

A)steam sterilize them.
B)place them in boiling water for 5 minutes.
C)rinse them under running tap water.
D)cover them with a plastic pouch before they are placed in the patient's mouth.

Answer 3

cover them with a plastic pouch before they are placed in the patient's mouth.

Question 4

Before sending a prosthesis to a dental laboratory, the prosthesis should be:

A)sterilized in a steam autoclave.
B)rinsed in water.
C)scrubbed with a nonantimicrobial hand washing agent.
D)cleaned, disinfected, and rinsed.

Question 5

Which of the following laboratory items can always be cleaned and heat sterilized?

A)Impressions
B)Prostheses
C)Bite registrations
D)Metal impression trays and face-bow forks

Question 6

What is the main infection control tenet concerning laboratory receiving areas?

A)Always wear fresh heavy utility gloves when entering the laboratory.
B)Never wear contaminated clothing into the laboratory.
C)All items coming from patients' mouths must be sterilized or disinfected before being taken into the laboratory.
D)Place prostheses and impressions in sterile containers before taking them into the laboratory.

Question 7

Which of the following cannot be disinfected?

A)Inside the sleeves of a daylight loader
B)The handle of an x-ray unit head
C)An impression
D)A denture

Question 8

The best way to manage films in a daylight loader is to:

A)use fresh powdered gloves to hold the contaminated film packets when inserting the hands through the sleeves; when inside, remove the plastic protective pouches and proceed with developing.
B)insert only disinfected or uncontaminated film packets into the loader using fresh uncontaminated powder-free gloves, and proceed with developing.
C)put on fresh gloves, take the film packets out of the protective plastic pouches, pass them through to the inside of the loader, remove the film from the packets, and proceed with developing.
D)with bare hands (so as not to contaminate the loader sleeves), remove the contaminated protective pouches, pass the film packets through the sleeves, open the packets, and proceed with developing.

Question 9

What should be done with the leftover polishing agents, such as rouge, after an appliance is polished?

A)Place it in a cup and run a slow stream of water into the cup to rinse the material.
B)Spread the material out in a pan and steam sterilize it.
C)Let it air-dry overnight and return it the central bulk stock.
D)Throw it away.

Question 10

The main rule of laboratory asepsis is that prostheses and appliances must be _____ before being handled in the laboratory.

A)heat sterilized
B)cleaned
C)rinsed with warm water
D)cleaned and disinfected

Question 11

What should be done to decontaminate items that do not normally contact the patient (e.g., burs, stones, polishing points, case pans)?

A)Rinse with warm water and dry.
B)Always sterilize in a dry heat sterilizer.
C)Clean and heat sterilize or disinfect according to the manufacturer's directions.
D)Ultrasonically clean, rinse, and dry.

Question 12

Which of the following is the best way to manage contamination of a daylight loader?

A)Disinfect the insides of the sleeves after every use.
B)Remove the sleeves after every use and sterilize them in a steam autoclave.
C)Never contaminate the sleeves.
D)Always wear the same gloves used with the patient when you enter the sleeves of the loader, because this prevents wasting gloves.

Question 13

What is the best way to clean a heavily soiled denture?

A)Place in a beaker under running tap water for 15 minutes.
B)Submerge in boiling water for 15 minutes.
C)Place in a zip-locked plastic bag or beaker containing an ultrasonic detergent and clean it ultrasonically.
D)Use a shell blaster.

Question 14

How should one manage the infection control of most digital radiographic sensors?

A)Heat sterilize them between patients.
B)Cover them to prevent contamination when placed in the mouth.
C)Soak them for 60 minutes in a liquid sterilant and then thoroughly rinse between patients.
D)Rinse them with warm water between patients.

Question 15

Disinfection of dental impressions should last _____ minutes.

A)5
B)15
C)30
D)60

Question 16

How should one disinfect an impression that is sensitive to immersion?

A)Steam sterilize it.
B)Dry heat sterilize it.
C)Spray it with the disinfectant and wrap with a disinfectant-soaked towel.
D)Brush it with a liquid sterilant.