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PRDP, Final > 7. Impression Materials & Techniques > Flashcards

7. Impression Materials & Techniques Flashcards

1
Q

Impression Materials
 Desirable Qualities
 ____ stability over temperature and humidity ranges normally met in clinical and laboratory procedures
 (long enough to permit the production of a ____)

Take a look at the others, Peter

A

dimensional

cast or die

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2
Q

Impression Materials
Aqueous Elastomers
 ____ hydrocolloids
 ____ hydrocolloids

Nonaqueous Elastomers
\_\_\_\_
 \_\_\_\_
 Condensation
 Addition (polyvinylsiloxanes)
 \_\_\_\_
A

reversible
irreversible

polysulfides
silicones
polyethers

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3
Q

Alginate Impressions

Use ____ tray which can conveniently be placed in the mouth

A

largest

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4
Q

Aqueous Elastomers

  • Irreversible hydrocolloids

we can work with our hydrocolloids
if we’re gonna use them to take impressions, we will send out and get master casts and make frameworks, w ehave to work with them properly
____ system is probably the most accurate because we’re getting the exact measure of powder and exact liquid
in practice, you use the tub and you have to shake it and carefully measure so you maximize its
properties and don’t get distortions

A

packet

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5
Q

Irreversible hydrocolloids

Make complete casts for removable prosthodontic cases

this allows us to get very accurate models that if the case is ____ this is the way to go get accurate alginate and you will get accurate fitting case

when utilizing Class II/ Class I scenario, looking at capturing tissue and might want to use ____ type of material

A

class III/IV

PVS

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6
Q

____ is highly desirable!!!!

techniques = ____ pour technique it’s important to show the laboratory where you want the final prosthesis to fit

A

land area

double

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7
Q

Irreversible Hydrocolloids

Advantages
 Most widely \_\_\_\_ impression materials in
modern dentistry
 Easy to \_\_\_\_
 Able to \_\_\_\_ blood and f luid
 Low cost
 Pleasant taste
 Easily poured in stone
 Can be used with \_\_\_\_ trays for preliminary impressions
A

used
manipulate
displace
stock

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8
Q 
Irreversible Hydrocolloids
Disadvantages
 Poor \_\_\_\_ stability
 Difficult to \_\_\_\_
 Poor \_\_\_\_ strength
 Must be poured \_\_\_\_
A

dimensional
disinfect
tear
immediately

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9
Q

Polysulfides

Advantages
 Long \_\_\_\_ time
 Proven accuracy
 High \_\_\_\_ resistance
 Inexpensive
 \_\_\_\_ shelf life
 \_\_\_\_ viscosity
 No special equipment
A

working
tear
long
low

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10
Q

Polysulfides

Disadvantages
 Requires a \_\_\_\_ tray
 Must be poured within \_\_\_\_ hr
 Possible distortion
 Odor & taste offends patients 
 Messy; \_\_\_\_ clothes
 Second pour- less \_\_\_\_
 Affected by \_\_\_\_ and humidity 
 \_\_\_\_-no \_\_\_\_ in sulcus
A 
custom
one
stains
accurate
temperature
hydrophobic
moisture
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11
Q

Nonaqueous Elastomers: Silicones

 Identified on the basis of their chemical reactions as ____ or ____ types

A

condensation

addition

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12
Q

Silicones – Latex Contamination
 Putties should not be mixed with ____ gloves
 ____ compounds incorporated into mix poison the platinum catalyst
– no ____

A

latex
sulfur
polymerization

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13
Q

PVS

Used in main clinic: ____

A

aquasil

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14
Q

Addition Silicones

Advantages
 \_\_\_\_ working time
 Easy to mix
 automatic mixing devices
 Adequate \_\_\_\_ strength
 Extremely high accuracy
 Undetectable \_\_\_\_ upon removal
 Dimensionally stable 
-- even after one \_\_\_\_
 Less distortion upon removal 
 Pleasant taste/odor
 \_\_\_\_ pours
A 
shorter
tear
distortion
week
multiple
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15
Q

Addition Silicones
Disadvantages
 ____ evolution in some products
 More ____ (automix)

A

H2

expensive

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16
Q 
Nonaqueous Elastomers Polyethers
 Commercial examples
 \_\_\_\_ (main clinic) 
 Permadyne
 Polygel
A

impregum

17
Q

Polyethers

Advantages
 \_\_\_\_ working time
 \_\_\_\_ setting time (5-6min)  Adequate tear strength
 Less \_\_\_\_
- better \_\_\_\_
 Less distortion w/ removal
A

fast
fast
hydrophobic
wetting

18
Q

Polyethers

Advantages
 ____ shelf life
 Good dimensional stability  ____ casts can be poured
 Pentamix automix system

A

long

multiple

19
Q

Polyethers

Disadvantages
 Clean but tastes bad
 Stiffness requires blocking out \_\_\_\_ 
 Slightly more expensive
 \_\_\_\_ tray needed
A

undercuts

custom

20
Q

Custom Trays
Advantages:
 More ____ than stock tray
 More ____ tray adaptation

A

rigid

accurate

21
Q

Rational for a Custom Tray

Advantages:
 Provides even ____ of impression material
– Minimizes the tendency for ____ areas to be developed which lead to distortions
 Facilitates the adjustments of tray extensions and border molding procedures

A

thickness

thin

22
Q 
Rational for a Custom Tray
Disadvantages:
 More laboratory \_\_\_\_ required 
 More laboratory \_\_\_\_ required 
 More \_\_\_\_ involved
A

time
cost
material

23
Q

Rational for a Custom Tray
Indications:
 ____-borne situations when accurate recording of soft tissue reflections is important
 ____-tissue borne situations when accurate recording of soft tissue reflections is important and an ____ cast impression is planned
 Anatomic limitations that ____ the use of stock tray

A

tooth
tooth
altered
prohibit

24
Q

Fabrication of Custom Impression Trays for PRDP Final Impressions

 The number of sheets of base plate wax used to adapt over the cast depends upon the type of ____ selected for the ____ impression

A

material

final

25
Q

Custom Tray-Irreversible Hydrocolloid
 Place ____ over entire diagnostic cast
 Place baseplate wax as relief over cast
– ____ sheet thickness over the soft tissue areas
– ____ sheet thickness over the teeth
 Create tissue stops in non-critical areas
– ____ surfaces of teeth (cut through wax)
 Place ____ over relief wax
– facilitates wax removal from the cast and tray
 Place custom tray material
 Perforate the tray using a #____ round bur

A 
vaseline
2
2
occlusal
vaseline
8
26
Q

Custom Trays
 Thin uniform coat of adhesive
 allow to dry for ____ minutes

A

5

27
Q

Irreversible Hydrocolloid Final Impression
 Place impression material into critical areas manually or with an impression syringe
– e.g. ____, palatal vault, areas of framework contact
– ____ mould impression
– Pour impression ____

A

rest seats
border
immediately

28
Q 
Disinfection of Impressions
Five types of chemical disinfectants used:
 \_\_\_\_ compounds
 \_\_\_\_ synthetic
phenolic compounds
 \_\_\_\_
 \_\_\_\_
 \_\_\_\_/alcohol combinations
A 
chlorine
combination
gluteraldehydes
iodophors
phenolic
29
Q 
Disinfection of Impressions
 Rinse impression under running water
 Spray entire impression
-- including \_\_\_\_
-- Allow surface to remain wet for several minutes 
-- Rinse
A

tray

30
Q

Troubleshooting Information For All Materials

• Never use ____ materials

A

expired

PRDP, Final (21 decks)

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