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
,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
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
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