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DA306 Chapter 46 Impression Materials & Techniques Flashcards | StudBud
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DA306 Chapter 46 Impression Materials & Techniques
DA306 Chapter 46 Impression Materials & Techniques
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1
How can the RDA/EFDA prevent triggering the gag reflex?
By using a fast-set alginate
Not overloading the tray with material
All of the above
Having the patient take deep breaths through their nose
2
What does the term “colloid” refer to?
Easy to manipulate
Rubber-like
Gelatinous substance
“To form around”
3
An adult maxillary impression requires how many scoops of powder to water ratio?
1:1
3:2
2:2
3:3
4
Syneresis involves the material changing color.
True
False
5
What is “agar”?
Sugar
Thickening agent
Gelatin-type material from seaweed used as a thickener
Ideal impression material
6
How many mm of material is needed between the impression tray & incisal edge?
2-3
1-3
3-4
However much is needed to adequately fill the try
7
When is an elastomeric impression material used?
Only when requested by the doctor
When the patient requests it
When nothing else is available
When an extremely accurate impression is needed
8
Why is a “bite registration” taken?
To produce a reproduction of centric occlusion
For patient education and prevention of lesions
To ensure the patient doesn’t damage oral mucosa during mastication
To confirm patient’s comfortability when chewing
9
Where should the RDA/EFDA fill the tray for a maxillary impression?
Towards the anterior/labial edge
It doesn’t matter
In the posterior to insure the capture of the patient’s tuberosity
In the sanitized area away from the patient’s view
10
The curing reaction begins as soon as the base and catalyst are brought together.
False
True
11
The retromolar area, lingual frenum, and mylohyoid ridge are reproduced in the mandibular impression.
False
True
12
Custom impression trays are available in what sizes?
Anterior & posterior trays
Quadrant, section, & full-arch trays
Canine to canine, bicuspid, & lateral trays
Front, side, & back trays
13
What is the working time for normal-set alginate impression material?
1-2 minutes maximum
2 minutes minimum
2 minutes maximum
2-4 minutes maximum
14
What is another word for “bite registration”?
Occlusal registration
Mastication registration
Final registration
Centric registration
15
Impression trays must be what to support the material in the patient’s mouth and not warped the completed impression?
Cold
Rigid
Smooth
Perforated
16
Potassium alginate is derived from seaweed.
True
False
17
Polysiloxane has the best dimensional stability.
True
False
18
Viscosity is a measure of a fluids thickness.
False
True
19
What can be used to help accommodate a high palatal vault?
Larger maxillary tray
All of the above
More impression material
Utility wax
20
An impression is a positive reproduction of teeth.
True
False
21
When using an Automix system, the catalyst & base are simultaneously released with the use of what?
Trituration
A dual cartridge extruder gun
It’s viscosity
A dycal applicator
22
The ideal water temperature for alginate is 70°F (21°C).
True
False
23
Where should the RDA/EFDA stand while taking impressions?
In the “static zone”
On the assistant side because they’re not qualified to be anywhere else
Between 12 & 2
Operator side for better access & visibility
24
An adult mandibular impression requires how many scoops of powder to water ratio?
3:3
1:1
2:3
2:2
25
Most alginate impression material can be “poured up” hours later after taking an impression.
True
False
26
Custom impression trays are made from a preliminary model AFTER the dentist has prepared the teeth.
False
True
27
Why is ZOE bite registration paste is the ideal material for occlusal bite registration?
Because it’s the most durable material
Because of it’s soothing properties
Because it’s the cheapest and most durable
Because patients enjoy the smell
28
A light-bodied material is used for its ability to flow.
False
True
29
Imbibition is swelling due to an absorption of water.
False
True
30
How are elastomeric impression mixed?
Only ever by an Automix system
With a rubber bowl, spatula, and vibrating pad
With equal parts water and powder
By hand using a paper pad and spatula, or by an Automix system
31
What is the most popular impression material used for a bite registration?
Utility wax
Polysiloxane
ZOE
Articulating paper
32
Can ZOE be used as a more durable impression material when taking a bite registration?
True
False
33
Section trays cover which area(s)?
Areas lacking teeth
Posteriors
Anteriors
Only half of an arch
34
Besides custom trays, what are preliminary impressions used for?
Reference guide for lab tech when creating indirect restorations
Dentures
Bite registration
Diagnostic models, provisional coverage, ortho, & treatment records
35
What are the 3 classifications of impressions?
Preliminary, final, & occlusal registration
Before, middle, & end
Final, bite, & occlusal registration
Quadrant, section, & full
36
What is needed during the setting process of a reversible hydrocolloid impression material?
Water-cooled tray
Room temperature water tray
Cool glass slab
Must be stored in fridge or freezer
37
What percentage of humidity is ideal for storing impressions?
100%
50%-60%
90%-100%
Less than 100%
38
When removing an alginate impression from a patient’s mouth, the RDA/EFDA should “rock” the tray free.
True
False
39
Reversible hydrocolloid material consists of what?
50% mix of water and agar, 50% mix of other chemical modifiers
80% water, 10% agar, & 10% other chemical modifiers
A base and catalyst
85% water, 13% agar, & 2% other chemical modifiers
40
Alginate is a reversible hydrocolloid.
True
False
41
Impressions must be disinfected:
Before leaving the treatment area
Only if impressions are soaked with bioburden
When the RDA has time
At the lab by the lab technician
42
A good impression must include what?
A surface free from voids
All the above
Sharp anatomical detail
The presence of retromolar pads and maxillary tuberosity‘s
43
The term “elastomeric” indicates “having elastic or rubber-like qualities.”
True
False
44
Which body is mixed first when taking an elastomeric impression?
Light-body
Large-body
Heavy-body
Small-body
45
Storing an alginate impression in a soaked paper towel can cause what?
Syneresis
Swelling
Shrinkage
Imbibition
46
What must the RDA/EFDA do to prevent gagging when taking an impression?
Limit the amount of material to prevent triggering the gag reflex
Pinch the patients nose while force the chin to the chest
Distract the patient with jokes
Seat the posterior portion of the tray first
47
What materials are used when creating a custom impression tray?
Acrylic resin, light-cured resin, or thermoplastic resin
Thermoplastic resin, composite resin, or irreversible hydrocolloid
Acrylic resin, amalgam, or thermoplastic resin
Anything found in the dental office
48
The tuberosity, labial frenum, & incisive papilla are reproduced in the mandibular impression.
False
True
49
RDA/EFDA’s are legally allowed to take a final impression.
True
False
50
Alginate is the most popular irreversible hydrocolloid material for preliminary impressions.
True
False
51
Alginate has an unlimited shelf life.
False
True
52
What is considered when sizing an impression tray?
Patient comfortability
Patient history
Patient allergies
Patient mobility
53
What are the advantages of the Automix system?
All the above
Less waste of materials
Increase in productivity
Less time spent on infection control
54
A quadrant tray covers which area(s)?
Posteriors
Only half of a dental arch
The entire dental arch
Anteriors
55
How should the patient close their mouth when taking a wax bite registration?
Lightly with increasing pressure
As hard as possible
Quickly for accuracy
Normally and gently
56
Calcium sulfate reacts to what to form gel?
Agar alginate
None of the above
Potassium alginate
Zinc alginate
57
What is “syneresis”?
Swelling due to an absorption of water
Another word for water
Chemical reaction from sol to gel
Shrinkage due to a loss of water
58
In dentistry, the term “Sol“ means what?
Solar
Solution
Soluble
Thickness of a liquid
59
Stock impression tray preparation for an elastomeric material requires the use of what on the tray?
Plenty of excess material
Adhesive
Utility wax
Cool water
60
An acceptable alginete impression should show clearly defined what?
Pits and fissures
anatomical details and peripheral borders
Buccal, occlusal, & lingual anatomy
Hard tissues of the mouth
