DASLE MN QUESTIONS AND ANSWERS
When taking alginate impressions, having the patient swish with a mouth rinse such as
Listerine prior to impressing helps decrease all of the following except:
a: drooling by the patient
B: microorganisms on the impression
C: gagging by the patient
D: bubbles in the material - Answer -a: Drooling by the patient
You are seating your patient to take alginate impressions, what position will you have
them in?
A: upright
B: reclined
C: standing
D: supine - Answer -a: Upright
Which of the following would not be an effective communication method?
A: ask the patient to use predetermined hand signals to communicate with you
B: explain to the patient that the material may feel cold
C: Ask the patient to breath through their mouth
D: inform the patient that they can bring their head forward and off the headrest once
you have seated the impression - Answer -C: Ask the patient to breath through their
mouth
The purpose for the perforations in the impression trays is:
A; to allow the impression material to flow out of the perforations B: creating a
mechanical lock between the impression and the tray
to allow for easier cleaning of the trays
C: to allow air to escape in order to reduce the amount of bubbles in the impression
D: to help reduce gagging by allowing excess material out of the mouth - Answer -A; to
allow the impression material to flow out of the perforations
What is the water-to-powder ratio for taking an adult maxillary alginate impression?
A: 1 scoop of powder to 1 measure of water
B: 2 scoops of powder to 2 measure of water
C: 3 scoop of powder to 3 measure of water
D: 1 scoop of powder to 2 measure of water - Answer -C: 3 scoop of powder to 3
measure of water
A patient is coming in for a crown prep on tooth #30. At the beginning of the
appointment you use polyvinyl siloxane impression material to take a preliminary
impression so you are able to fabricate a temporary crown. At the end of the
appointment there needs to be a final impression taken of the tooth after it is prepared.
Who is legally responsible and delegated to take this final impression?
A: RDH
,B: LDA
C: RDA
D: DDS - Answer -D; DDS
An impression is defined as a positive reproduction of oral tissue and surrounding
structures, where a stone cast is a negative reproduction.
True
False - Answer -FALSE
Elastomeric impression materials are great for taking final impressions when accuracy
and detail are needed, all of the following are examples of elastomeric materials except:
A: polyvinyl siloxane
B: reversible hydrocolloid
C: polysulfide
D: polyether
E: silicone - Answer -B: reversible hydrocolloid
The _______ tray covers half of a dental arch.
A: Full-arch
B: custom
C: section
D: quadrant - Answer -D: quadrant
In order to best record the muscle attachments, frenums, and achieve a complete
peripheral roll, the operator will need to perform_________ by gently massaging the
patients lips and cheeks.
A: facial trimming
B: frenectomy
C: muscle trimming
D; muscle rolling - Answer -C: muscle trimming
A main advantage of polyvinyl siloxane is that it has high dimensional stability and
pouring can be delayed for up to 7-10 days without distorting.
True
False - Answer -TRUE
Polysulfide is an impression material where the disadvantages outweigh the
advantages. Some of the main disadvantages are the odor, bad taste, it stains, and has
a long setting time.
True
False - Answer -TRUE
An impression tray should extend _____ mm beyond the last tooth in the arch.
A: 1-2
B: 2-3
C: 3-4
,D: 4-5 - Answer -B: 2-3
If an alginate impression remains in the open air, moisture will evaporate from the
material, causing it to shrink and distort. This condition is called:
A: expansion
B: imbibition
C: synersis
D: adaptation - Answer -C: synersis
As a right handed operator, when seating the mandibular impression, you want to be
standing at the side of the patient, near 8-9 o'clock. When seating the maxillary
impression, you will want to be behind the patients head, near 11-12 o'clock.
True
False - Answer -TRUE
When might the fabrication of a custom tray be necessary?
A: the stock trays do not fit the patients mouth properly
B: the patient is edentulous
C: the patient needs whitening trays
D: the patient needs a specific orthodontic appliance
E: all of the above - Answer -E: all of the above
When seating an alginate impression in the mouth, it is centered over the teeth and
then:
A: seated in the anterior first, then the posterior
B: seated in the posterior first, then the anterior
C: seated left to right
D: seated right to left
E: it doesn't matter as long as you get is into the patients mouth before it sets up -
Answer -B: seated in the posterior first, then the anterior
Baseplate wax is _________ prior to placing it in the patients mouth for a bite
registration.
A:molded
B: placed in a tray
C: warmed
D: cooled - Answer -C: warmed
You have just finished taking alginate impressions for bleaching trays, but are unable to
pour them up right away. What should you do?
A: keep them on the counter until you are ready to pour them up
B: wrap them in a moist paper towel and place them in a plastic bag
C: soak them in a bowl of water
D: let them dry out as pouring up dry impressions is easier - Answer -b: wrap them in a
moist paper towel and place them in a plastic bag
, The medium mandibular stock tray you have tried in your patients mouth seems to be
hitting the lingual areas of both the right and the left teeth, what size tray should you tray
in your patients mouth next?
A: large
B: small - Answer -B: SMALL
Which of the following would not be a critical item when evaluating a maxillary
impression?
A: hamular notch
B: tuberosity
C: retromolar area
D: palate - Answer -C: retromolar area
For a mandibular impression, the correct length of the tray would include:
A: tuberosity
B: retromolar area
C: hamular notch
D: tooth #16 if present - Answer -B: retromolar area
The setting time is the time from the start of the mix until the material has set; where the
working time is the time for mixing the alginate, loading the tray and positioning the tray
in the patients mouth.
True
False - Answer -TRUE
When selecting a tray for an alginate impression, how much space is sufficient between
the occlusal surface and the tray?
A: 1-2mm
B: 2-3mm
C: 3-6mm
D: 6-7mm - Answer -B: 2-3mm
When mixing alginate impression material, by decreasing the temperature of the water,
you will _____________ your working time.
A: decrease
B: increase - Answer -B: INCREASE
If the maxillary tray needs to be extended 2-3mm posteriorly, which of the following
would be used to extend the tray?
A: baseplate wax
B: sticky wax
C: utility wax
D; silicone impression material - Answer -C: utility wax
What may occur to your poured up model if you did not remove bioburden from the
impression?
When taking alginate impressions, having the patient swish with a mouth rinse such as
Listerine prior to impressing helps decrease all of the following except:
a: drooling by the patient
B: microorganisms on the impression
C: gagging by the patient
D: bubbles in the material - Answer -a: Drooling by the patient
You are seating your patient to take alginate impressions, what position will you have
them in?
A: upright
B: reclined
C: standing
D: supine - Answer -a: Upright
Which of the following would not be an effective communication method?
A: ask the patient to use predetermined hand signals to communicate with you
B: explain to the patient that the material may feel cold
C: Ask the patient to breath through their mouth
D: inform the patient that they can bring their head forward and off the headrest once
you have seated the impression - Answer -C: Ask the patient to breath through their
mouth
The purpose for the perforations in the impression trays is:
A; to allow the impression material to flow out of the perforations B: creating a
mechanical lock between the impression and the tray
to allow for easier cleaning of the trays
C: to allow air to escape in order to reduce the amount of bubbles in the impression
D: to help reduce gagging by allowing excess material out of the mouth - Answer -A; to
allow the impression material to flow out of the perforations
What is the water-to-powder ratio for taking an adult maxillary alginate impression?
A: 1 scoop of powder to 1 measure of water
B: 2 scoops of powder to 2 measure of water
C: 3 scoop of powder to 3 measure of water
D: 1 scoop of powder to 2 measure of water - Answer -C: 3 scoop of powder to 3
measure of water
A patient is coming in for a crown prep on tooth #30. At the beginning of the
appointment you use polyvinyl siloxane impression material to take a preliminary
impression so you are able to fabricate a temporary crown. At the end of the
appointment there needs to be a final impression taken of the tooth after it is prepared.
Who is legally responsible and delegated to take this final impression?
A: RDH
,B: LDA
C: RDA
D: DDS - Answer -D; DDS
An impression is defined as a positive reproduction of oral tissue and surrounding
structures, where a stone cast is a negative reproduction.
True
False - Answer -FALSE
Elastomeric impression materials are great for taking final impressions when accuracy
and detail are needed, all of the following are examples of elastomeric materials except:
A: polyvinyl siloxane
B: reversible hydrocolloid
C: polysulfide
D: polyether
E: silicone - Answer -B: reversible hydrocolloid
The _______ tray covers half of a dental arch.
A: Full-arch
B: custom
C: section
D: quadrant - Answer -D: quadrant
In order to best record the muscle attachments, frenums, and achieve a complete
peripheral roll, the operator will need to perform_________ by gently massaging the
patients lips and cheeks.
A: facial trimming
B: frenectomy
C: muscle trimming
D; muscle rolling - Answer -C: muscle trimming
A main advantage of polyvinyl siloxane is that it has high dimensional stability and
pouring can be delayed for up to 7-10 days without distorting.
True
False - Answer -TRUE
Polysulfide is an impression material where the disadvantages outweigh the
advantages. Some of the main disadvantages are the odor, bad taste, it stains, and has
a long setting time.
True
False - Answer -TRUE
An impression tray should extend _____ mm beyond the last tooth in the arch.
A: 1-2
B: 2-3
C: 3-4
,D: 4-5 - Answer -B: 2-3
If an alginate impression remains in the open air, moisture will evaporate from the
material, causing it to shrink and distort. This condition is called:
A: expansion
B: imbibition
C: synersis
D: adaptation - Answer -C: synersis
As a right handed operator, when seating the mandibular impression, you want to be
standing at the side of the patient, near 8-9 o'clock. When seating the maxillary
impression, you will want to be behind the patients head, near 11-12 o'clock.
True
False - Answer -TRUE
When might the fabrication of a custom tray be necessary?
A: the stock trays do not fit the patients mouth properly
B: the patient is edentulous
C: the patient needs whitening trays
D: the patient needs a specific orthodontic appliance
E: all of the above - Answer -E: all of the above
When seating an alginate impression in the mouth, it is centered over the teeth and
then:
A: seated in the anterior first, then the posterior
B: seated in the posterior first, then the anterior
C: seated left to right
D: seated right to left
E: it doesn't matter as long as you get is into the patients mouth before it sets up -
Answer -B: seated in the posterior first, then the anterior
Baseplate wax is _________ prior to placing it in the patients mouth for a bite
registration.
A:molded
B: placed in a tray
C: warmed
D: cooled - Answer -C: warmed
You have just finished taking alginate impressions for bleaching trays, but are unable to
pour them up right away. What should you do?
A: keep them on the counter until you are ready to pour them up
B: wrap them in a moist paper towel and place them in a plastic bag
C: soak them in a bowl of water
D: let them dry out as pouring up dry impressions is easier - Answer -b: wrap them in a
moist paper towel and place them in a plastic bag
, The medium mandibular stock tray you have tried in your patients mouth seems to be
hitting the lingual areas of both the right and the left teeth, what size tray should you tray
in your patients mouth next?
A: large
B: small - Answer -B: SMALL
Which of the following would not be a critical item when evaluating a maxillary
impression?
A: hamular notch
B: tuberosity
C: retromolar area
D: palate - Answer -C: retromolar area
For a mandibular impression, the correct length of the tray would include:
A: tuberosity
B: retromolar area
C: hamular notch
D: tooth #16 if present - Answer -B: retromolar area
The setting time is the time from the start of the mix until the material has set; where the
working time is the time for mixing the alginate, loading the tray and positioning the tray
in the patients mouth.
True
False - Answer -TRUE
When selecting a tray for an alginate impression, how much space is sufficient between
the occlusal surface and the tray?
A: 1-2mm
B: 2-3mm
C: 3-6mm
D: 6-7mm - Answer -B: 2-3mm
When mixing alginate impression material, by decreasing the temperature of the water,
you will _____________ your working time.
A: decrease
B: increase - Answer -B: INCREASE
If the maxillary tray needs to be extended 2-3mm posteriorly, which of the following
would be used to extend the tray?
A: baseplate wax
B: sticky wax
C: utility wax
D; silicone impression material - Answer -C: utility wax
What may occur to your poured up model if you did not remove bioburden from the
impression?
