Dental Hygiene National Board With complete
solutions | latest update 2026/2027
What are some examples of bio-hazard waste? - Ans Sharps, items that drip of blood
and/or saliva, and hard and soft tissues removed from patient
The bio-hazard waste or regulated true or false? - Ans True
When should we change our mask? - Ans When it becomes wet or soiled with every
patient. That includes your fluids as well.
What is the purpose of PPE? - Ans Is to minimize the exposure to Aerosol, Spatter, Direct
transmission, and Indirect transmission (ASDI)
Do disinfectants kill spores? - Ans NO
What are some types of disinfectants? - Ans Chlorine-based compounds, iodophors,
phenols, quaternary compounds
What are some bad qualities of chlorine-based compounds? - Ans corrosive to metals and
strong odor
What are some bad qualities of phenols? - Ans may leave a film or residue on surfaces
What are some bad qualities of iodophors? - Ans can discolor some surfaces yellow
,What are some bad qualities of quaternary compounds? - Ans not corrosive, but have a
lower kill spectrum
What would be some good qualities of disinfectants? - Ans rapid, broad spectrum
antimicrobial, bacteriocidal, fungicidal, tuberculocidal, virucidal, odorless, easy to use, fast
acting, economical, residual effect which it continues to work after it dries, not toxic to touch or
inhalation, EPA registered, and disinfects and cleans.
Is a spatter invisible to the eye? - Ans NO, can see it when airborne
Is aerosol invisible to the eye? - Ans yes, remain in the air for a while
What sheet provides an employee with information regarding the hazards of chemicals utilized
in the office and how to protect themself? - Ans MSDS (Material Safety Data Sheet)
What disinfectant should not be used as a surface disinfectant in the office and why? -
Ans Glutaraldehydes, toxic effects of fumes; also corrosive
What kind of disinfectants are used in the dental office? - Ans Intermediate
What are some methods of sterilization? - Ans Chemical, Dry, and Steam
During chemical sterilization, how long at what degree and pressure are used? - Ans 20
min @ 270 degree F @ 20-40 lbs psi
During Dry sterilization, how long at what degree are used? - Ans 60-120 min @ 320
degree F
, During Steam sterilization, how long at what degree and pressure are used? - Ans 20-30
min @ 250 degree F @ 15-30lb psi
What method of sterilization involves the least temperature? - Ans Steam at 250 degree F
What are some considerations when using the chemical method? - Ans ventilation is
necessary, may damage rubber and plastic items
What are some considerations when using the dry method? - Ans recommended for
metal instruments, avoid paper products, may damage, rubber and plastic items, and not
recommended for handpieces.
What are some considerations when using the steam method? - Ans corrodes non-
stainless steel instruments, dulls instruments and burs, ok for some plastics; cotton rolls and
gauze, paper packages come out wet and tear.
What is the only way to tell if the instruments are sterilized? - Ans A weekly spore test
Does indicator tape always guarantee sterility? - Ans NO, only spore test
What spore test is used with chemical sterilization? - Ans Geobacillus (formerly Bacillus)
stearothermophilus
What spore test is used with dry sterilization (static air)? - Ans Bacillus atrophaeus/
subtilis
solutions | latest update 2026/2027
What are some examples of bio-hazard waste? - Ans Sharps, items that drip of blood
and/or saliva, and hard and soft tissues removed from patient
The bio-hazard waste or regulated true or false? - Ans True
When should we change our mask? - Ans When it becomes wet or soiled with every
patient. That includes your fluids as well.
What is the purpose of PPE? - Ans Is to minimize the exposure to Aerosol, Spatter, Direct
transmission, and Indirect transmission (ASDI)
Do disinfectants kill spores? - Ans NO
What are some types of disinfectants? - Ans Chlorine-based compounds, iodophors,
phenols, quaternary compounds
What are some bad qualities of chlorine-based compounds? - Ans corrosive to metals and
strong odor
What are some bad qualities of phenols? - Ans may leave a film or residue on surfaces
What are some bad qualities of iodophors? - Ans can discolor some surfaces yellow
,What are some bad qualities of quaternary compounds? - Ans not corrosive, but have a
lower kill spectrum
What would be some good qualities of disinfectants? - Ans rapid, broad spectrum
antimicrobial, bacteriocidal, fungicidal, tuberculocidal, virucidal, odorless, easy to use, fast
acting, economical, residual effect which it continues to work after it dries, not toxic to touch or
inhalation, EPA registered, and disinfects and cleans.
Is a spatter invisible to the eye? - Ans NO, can see it when airborne
Is aerosol invisible to the eye? - Ans yes, remain in the air for a while
What sheet provides an employee with information regarding the hazards of chemicals utilized
in the office and how to protect themself? - Ans MSDS (Material Safety Data Sheet)
What disinfectant should not be used as a surface disinfectant in the office and why? -
Ans Glutaraldehydes, toxic effects of fumes; also corrosive
What kind of disinfectants are used in the dental office? - Ans Intermediate
What are some methods of sterilization? - Ans Chemical, Dry, and Steam
During chemical sterilization, how long at what degree and pressure are used? - Ans 20
min @ 270 degree F @ 20-40 lbs psi
During Dry sterilization, how long at what degree are used? - Ans 60-120 min @ 320
degree F
, During Steam sterilization, how long at what degree and pressure are used? - Ans 20-30
min @ 250 degree F @ 15-30lb psi
What method of sterilization involves the least temperature? - Ans Steam at 250 degree F
What are some considerations when using the chemical method? - Ans ventilation is
necessary, may damage rubber and plastic items
What are some considerations when using the dry method? - Ans recommended for
metal instruments, avoid paper products, may damage, rubber and plastic items, and not
recommended for handpieces.
What are some considerations when using the steam method? - Ans corrodes non-
stainless steel instruments, dulls instruments and burs, ok for some plastics; cotton rolls and
gauze, paper packages come out wet and tear.
What is the only way to tell if the instruments are sterilized? - Ans A weekly spore test
Does indicator tape always guarantee sterility? - Ans NO, only spore test
What spore test is used with chemical sterilization? - Ans Geobacillus (formerly Bacillus)
stearothermophilus
What spore test is used with dry sterilization (static air)? - Ans Bacillus atrophaeus/
subtilis
