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Fixed Prosth Final > 8. Elastic Impression Materials > Flashcards

8. Elastic Impression Materials Flashcards

1
Q 
Impression Technique
• Fabricate \_\_\_\_
• Apply tray adhesive
• Bleed \_\_\_\_
• Fill syringe
• Fill \_\_\_\_
• Syringe impression mat around teeth
• Insert \_\_\_\_
A

custom tray
dispenser
syringe
tray

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2
Q

Application of Tray Adhesive
• Use right ____ for impression material
• Inadequate adhesion= ____ and ____

A

adhesive
dislodgement
distortion

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3
Q

Adhesives in Impression Tray
• Adhesives improve ____ of impressions

material shrinking > ____ dye
if you use adhesive and material is shrinking and you use an adhesive and you end up with a slightly ____ dyed

A

accuracy
undersized
oversized

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4
Q 
Viscosity of Impression Materials
• \_\_\_\_
• Heavy Bodied
• \_\_\_\_/Regular Bodied 
• Light Bodied (Wash

light body = most ____ detail

A

putty
medium
accurate

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5
Q

Impression techniques

(Multiple mix) Putty/Tray Wash

  • multiple ____ technique
  • the putty is used to form a ____
A

mix

custom tray

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6
Q

Impression techniques
Putty wash continued

remove plastic sheet > squeeze in light body (also called a ____)

____ mix technique
- in other techniques heavy body is used, but it’s not used to ____ the tray

A

wash
double
load

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7
Q

Impression techniques
Single mix

  • same ____ but we are squeezing around the teeth
A

viscosity

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8
Q

Properties of an ideal impression material

Accuracy
• Reproduction of ____
• Dimensional ____

  • ____
  • Tear Strength/Energy
  • Adherence to ____ tray
  • Compatibility with ____ materials
A 
detail
stability
elasticity
impression
die
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9
Q

Tear Strength
• Resistance to Tearing of Elastomers
1. ____ 2. ____ 3. ____

A

polysulfide
polyether
silicones

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10
Q 
Ideal Properties
Handling Characteristics
• Working time
• Setting time
• Shelf life

ideal working time = ____
setting time for experience is ____; up to ____ for inexperienced
normal shelf life is how long can we store material before it begins to ____

A

one
2-3
6
degrade

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11
Q

Elastic Impression Materials Classification

• Elastomers
– Aqueous Elastomers
• ____
• ____

– Non Aqueous Elastomers/Rubber Based
• \_\_\_\_
• \_\_\_\_ 
• \_\_\_\_
• \_\_\_\_
A

agar agar
alginate

polysulfide
condensation silicone
addition silicone
polyethers

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12
Q 
Non Aqueous Elastomers (Rubber based Impression materials)
a. Presentation
\_\_\_\_ pastes 
\_\_\_\_ systems
b. Clinical use and features
A

base and catalyst

automix

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13
Q

Polysulfide (mercaptan)

Base Paste
____ polymer with terminal and pendant -____- groups
Fillers ____
- ____ Plasticizers

Accelerator Paste
• Cross linking agent - ____
• Fillers - ____
• Plasticizers

A

polysulfide
SH
TiO2

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14
Q

Setting Reaction
• Condensation polymerization with ____ by-product
• ____ Rn

polysulfide prepolymer is also called a ____. with the ____ (catalyst), it gives you a ____ and some lead oxide and water.

condensation produce is ____ which is released via a bubble

in condensation reaction > acid ____, diminishing the ____ of the impression

A 
water
exothermic
mercaptan paste
lead dioxide
cross-linked polysulfide

water
evaporates
accuracy

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15
Q

Presentation

  • ____
  • Medium
  • ____ body
  • Used with ____ tray
A

heavy
light
custom

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16
Q

Dispensing of Impression

• Squeeze ____ lengths of base and catalyst onto mixing pad

A

equal

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17
Q

Mixing

• Mix with stiff spatula to a ____ color

A

uniform

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18
Q 
Polysulfides- Properties
Accuracy
• Detail reproduction - 25 um
• Elastic recovery 96.5%
 • Flow  0.4-1.9%
• Flexibility 10-16%
  • ER is ____
  • ____ flowing material, and it causes a ____ working and setting time
  • flexibility is ____
A

low
high
long
high

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19
Q

Polysulfides- Properties
Accuracy

• Dimensional stability
– setting rn
– flow on setting
– no ____ pours

  • Shrinkage (24hr) 0.45%
  • Tear strength ____
  • Storage ____ hr
  • ____ shrinkage due to condensation product > cannot make ____ pours; only first pour is accurate
  • high ____ > if it were low or it would break often
  • ____ elasticity and flexibiilty > stretched beyond capability to recover so those characteristics
  • bc of the shrinkage > cannot store it for more than ____ hour, but newer research says ____
A

multiple
high
1

high
multiple
tear strength
high
one hour
30 minutes
20
Q 
Polysulfides- Properties
Handling
• Working time - \_\_\_\_ min
• Setting time - \_\_\_\_ min
• Effect of temp/humidity 
• \_\_\_\_ on Loading
• Can be \_\_\_\_
  • have a long ____ and ____
  • setting is ____ at hot temperatures and humidity
  • non aqeuous elastomers are highly ____ and bc of that they can all be electroplated
A 
5-7
9-12
distortion
electroplated
working time
setting time
accelerated
hydrophobic
21
Q

Polysulfides- Biological/Clinical Features

Smell/taste
____ working/setting time
____ flow (low viscosity) on mixing
____ flexibility/tear strength ____ accuracy

  • not pleasant smell and will ____ your clothes
A 
long
high
high
low
stain
22
Q

Condensation Silicone

  • Base paste
  • ____

• Catalyst Paste/liquid
• Crosslinking agent:
____ +
• ____

  • the base paste is best described as a ____ bc it is already polymerized
A

hydroxy terminated polydimethryl siloxane

orthoalkyl silicate
tin octoate
prepolymer

23
Q

Setting Reaction
____ polymerization with (volatile) ____
by-product

  • accuracy is similar to ____
A

condensation
alcohol
polysulfide

24
Q

Presentation

• ____, Heavy, ____ and Light bodied

A

putty

medium

25
Q 
Condensation Silicones Properties
Accuracy
• Reproduction of detail 25 um
Elastic recovery \_\_\_\_%
Tear strength \_\_\_\_
  • Dimensional Stability – Shrinkage (24hr) 0.2-1%
  • Storage ____ hr
  • similar to polysulfide > the shrinkage is too ____ and the accuracy is not greate
A

99
high
1
high

26
Q

Condensation Silicones- Handling Properties

  • Working time ____ min
  • Setting time ____ min
  • Effect of temp and humidity • Can be ____
  • key negativity here = high ____ due to release of alcohol
  • but the other properties are better than ____
A 
3
6-8
electroplated
shrinkage
polysulfide
27
Q

Condensation Silicones- Biological /Clinical characteristics

• Clean, \_\_\_\_ taste/smell
• Control setting time with amount of
\_\_\_\_
• \_\_\_\_, dry field
• \_\_\_\_technique
A

pleasant
accelerator
hydrophobic
putty/wash

28
Q

Addition Silicone (PVS)

Base Paste
• ____ polymer
• Silanol and fillers

Catalyst Paste
• ____
• ____

  • PVS is the most ____ non-aqueous elastomer impression material
  • base paste polymer is very similar to what we saw for the ____
A 
vinyl terminated polydimethyl siloxane
chloroplatinic acid
filler
popular
condensation silicone
29
Q

Setting Reaction
____ polymerization reaction with no ____ by-products

  • the by-products do not affect the ____
A

addition
volatile
accuracy

30
Q 
Addition Silicones
Accuracy
• Reproduction of detail 25 um
• Elastic recovery 99.9%
• Tear strength \_\_\_\_
• Shrinkage (24hr)  0.01-0.2%
• Storage \_\_\_\_ week
  • ER is very ____
A

low to high
1
high

31
Q 
Addition Silicones
Accuracy
• Porosity - \_\_\_\_ gas 
• Distortion - Poor use of
adhesive
  • manufacturer recommends you wait about ____ after the impression has set before you pour it
A

hydrogen

30 minutes

32
Q

Addition Silicones

Handling
• \_\_\_\_, Heavy, \_\_\_\_, Medium, light body
• Working time - \_\_\_\_ min
• Setting Time - \_\_\_\_ min
– temperature, catalyst, contamination
– tin/sulfur compounds, powdered gloves
thinners
  • rxn is affect by ____ and amount of ____
  • tin/sulfure compounds will ____ or ____ the setting
    • ____ gloves have sulfur!
  • thinners reduce the ____ even further
A 
putty
regular
2-4.5
3-7
temp
catalyst
slow down
stop
powdered
viscosity
33
Q

Addition Silicones- Clinical Characteristics

  • Pleasant taste/odor
  • Delay pouring for ____ hr (H2) releasing • ____ pours
  • ____/hydrophilic products
  • ____ inhibition
  • ____
  • materials have been improved by addition of ____ to make them more hydrophilic > easier to spread on teeth
  • however, if electroplating, ____ materials are better
A

1
multiple

hydrophobic
tin and sulfure
electroplating
surfactants
hydrophobic
34
Q

Effect of Storage on Accuracy
• Top row - Addition silicone
• Bottom row - Condensation silicone
• A=30min, B=6hrs, C=24hrs

  • all ____ the same; but with ____ there is a gap that develops after 30 minutes
A

addition silicone

condensation silicone

35
Q

Polyether - Composition

Base Paste
• ____ polymer
• ____ - Filler
• ____ - Plasticizer

Catalyst Paste
• ____
• Filler + Plasticizer

this base paste is also a ____

A

polyether
colloidal silica
glycol ether

alkyl aromatic sulfonate
prepolymer

36
Q

Polyether Reaction

• ____ polymerization with ring opening of ____ (ethylene-imine).
• No ____ by-products
Polyether polymer + Sulfonic ester
—> ____ rubber

  • side chains = ____
A 
ionic
aziridine rings
volatile
polysulfide
aziridine rings
37
Q

Pentamix Delivery System

• ____ auto mix system

A

pentamix

38
Q 
Polyether Properties
Accuracy
• Reproduction of detail 25m
• Elastic recovery 98.5%
• Tear strength  \_\_\_\_
• Shrinkage (24hr) 0.2- 0.3%
• Storage  \_\_\_\_ wk
• \_\_\_\_ absorption
  • ER is not as high as ____
  • make sure no humidity or moisture when storing bc otherwise it will absorb ____ and ____ > poor ____
A 
low to hight
1
water
addition silicone
water
swell
accuracy
39
Q 
Polyether Properties
Handling
• Light body, medium, heavy body 
• Working time - \_\_\_\_ min
• Setting \_\_\_\_ min
• \_\_\_\_
• Effect of thinners
  • which impression is most rigid? > ____
  • has thinners to reduce the ____
A 
2.5
3-5
rigid
polyether
viscosity
40
Q

Polyether Properties

Biologic Properties
• ____ reaction to catalyst

A

dermal

41
Q

Polyether Clinical Characteristics

• Pleasant handling but \_\_\_\_ taste 
• \_\_\_\_ impression material
– Limit to few teeth, no severe \_\_\_\_
• \_\_\_\_
• \_\_\_\_ working time 
• \_\_\_\_ plate
  • can be electroplated and for this ____ is the most common, rather than copper
A 
bitter
stiffest
undercuts
hydrophilic
short
silver
silver
42
Q

Disinfection

Diseases of concern
• Viral diseases
eg. ____, AIDS, ____

A

hepatitis B

herpes simplex

43
Q

Disinfectants

• 1% \_\_\_\_
• 2% \_\_\_\_ solution
immersion for 10-30 min
• \_\_\_\_
• \_\_\_\_
  • some of the products pick up ____
A 
sodium hypochlorite
glutaraldehyde
iodophors
phenolics
moisture
44
Q

Elastomers

Aqueous vs. Non Aqueous

Accuracy
Elastic recovery
Tear Strength

A

comparisons??

45
Q

Check the table for the comparisons of non-aqueous elastomers!

A

yay

Fixed Prosth Final (15 decks)

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