Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Biomaterials > Elastomeric Impression Materials > Flashcards

Elastomeric Impression Materials Flashcards

1
Q

THE DENTAL ADVISOR

In vitro Studies

> Biomaterials

> Microbiology

Clinical Marketing Studies

> Restorative materials – placement andlong-term

> Infection control products

> Equipment

A

THE DENTAL ADVISOR

In vitro Studies

> Biomaterials

> Microbiology

Clinical Marketing Studies

> Restorative materials – placement and

long-term

> Infection control products

> Equipment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Elastomeric Impression Materials

More ___ and more ____ to ____ than alginates

Being partially replaced by ___ impressions

Alginate is not very stable, it tears/distorts badly overtime

Sometimes its easier to make an impression and then scan that!

A

Elastomeric Impression Materials

More accurate and more resistant to tearing than alginates

Being partially replaced by digital impressions

Alginate is not very stable, it tears/distorts badly overtime

Sometimes its easier to make an impression and then scan that!

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Common Names: Types of Impression Materials that are available

Addition ____ – ___ ___ ___(VPS): 60%

____ 30%

___ – ___ ___ ___e – ___

A

Common Names: Types of Impression Materials that are available

Addition silicone – poly vinyl siloxane (VPS): 60%

Polyether: 30%

PEVS – polyether vinyl siloxane – hybrid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Consistencies

  • ___, ___ ___, ___,___
  • ___
  • ____
  • ___
  • ___

Can be fast set or regular set

Types of Packaging

A

Consistencies

  • Light, extra light, syringe, wash
  • Medium
  • Monophase
  • Heavy
  • Putty

Can be fast set or regular set

Types of Packaging

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Impression Techniques

  • ___/___ (1 step)
  • ___/___ (2 step)
  • ___/___ (___/___)
  • ____

Putty wash popular in Europe

Heavy/Light popular in US

Polyether is monophase

A

Impression Techniques

  • Putty/Wash (1 step)
  • Putty/Wash (2 step)
  • Heavy/Light (Tray/Wash)
  • Monophase

Putty wash popular in Europe

Heavy/Light popular in US

Polyether is monophase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Mixing Options

Hand-mixed – ___, ___

Not used much anymore

Auto-mixed – ___, ___-___ ___ (gun)

90%

Motor-mixed – ___

If doing a large number of impressions everyday

A

Mixing Options

Hand-mixed – tube, tub

Not used much anymore

Auto-mixed – cartridge, unit-dose syringe (gun)

90%

Motor-mixed – sausage

If doing a large number of impressions everyday

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Hand-mixing of Putty

Mix using ___ gloves

Surface_____ of Impression

Latex gloves can cause contamination

Orange peel effect, material not completely set where the margins are

Poor ___ of Cast

This is what lab will see if they pour the impression with glove contamination

A

Hand-mixing of Putty

Mix using vinyl gloves

Surface Inhibition of Impression

Latex gloves can cause contamination

Orange peel effect, material not completely set where the margins are

Poor Surface of Cast

This is what lab will see if they pour the impression with glove contamination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Motorized Mixing

3M ESPE Pentamix 3 - 3M ESPE
Duomix - DENTSPLY Caulk
Dynamic Mixing Machine - Coltène/Whaledent
Dynamix speed - Heraeus
MixStar eMotion – DMG America

Volume Mixer - Kerr Corporation

A

Motorized Mixing

3M ESPE Pentamix 3 - 3M ESPE
Duomix - DENTSPLY Caulk
Dynamic Mixing Machine - Coltène/Whaledent
Dynamix speed - Heraeus
MixStar eMotion – DMG America

Volume Mixer - Kerr Corporation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Auto-mixed Cartridge

__- & ___ ___ Cartridges

___ ___ & ___ ___

Intraoral Tips: For wash around your prep

Meanwhile, assistant is mixing the putty

A

Auto-mixed Cartridge

50- & 75-mL Cartridges

Dispensing Guns & Mixing Tips

Intraoral Tips: For wash around your prep

Meanwhile, assistant is mixing the putty

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Components and Function

  • ___ – reacts to form ___
  • ___ – accelerates reaction
  • ___- controls ___
  • ___ flavor, scent

If you are doing a 2 step material where you have a tray and a wash around the prep, they have to bond together or you will get a bad impression

You have to be able to see the contrast. You have to be able to read the margin to know if you got a good impressionà Color

A

Components and Function

  • Prepolymer – reacts to form polymer
  • Catalyst – accelerates reaction
  • Filler – controls consistency
  • Color, flavor, scent

If you are doing a 2 step material where you have a tray and a wash around the prep, they have to bond together or you will get a bad impression

You have to be able to see the contrast. You have to be able to read the margin to know if you got a good impressionà Color

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Setting Reactions – By-products

  • Addition silicones –____
  • Polyether – ___

Clinical Importance of By-products

  • Evaporation in ___(Condensation Silicon) and___(Polysulfide) – excessive ____
  • Hydrogen gas of AS – ___ in ___

CS, PS: older impression materials

Condensation Silicone: not really used in practice. Some labs use it bc its cheap, just not great for patients

A

Setting Reactions – By-products

  • Addition silicones – hydrogen gas
  • Polyether – none

Clinical Importance of By-products

  • Evaporation in CS (Condensation Silicon) and PS (Polysulfide) – excessive shrinkage
  • Hydrogen gas of AS – porosity in die

CS, PS: older impression materials

Condensation Silicone: not really used in practice. Some labs use it bc its cheap, just not great for patients

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Properties before Setting

Viscosity –___ easy to mix

Wettability – wetting of tooth and tissue, wetting by ____

hydrophilic (___ wetting) ___> ___ (___ wetting)

PE Hydro__

AS Hydro___

Impression material has to lay down on tooth that may have some moisture

If it doesn’t wet the tooth, can get bubbles

Wettability

High contact angle –___ wettability

Low contact angle – ___ wettability

A

Properties before Setting

Viscosity –AS easy to mix

Wettability – wetting of tooth and tissue, wetting by gypsum

hydrophilic (good wetting) PE > AS (less wetting)

PE Hydrophillic

AS Hydrophobic

Impression material has to lay down on tooth that may have some moisture

If it doesn’t wet the tooth, can get bubbles

Wettability

High contact angle –poor wettability

Low contact angle – good wettability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Setting Time

___ set is desirable –

Newest materials havesnap ___ – setting begins in the mouth

You want material to have a ___ working time and then ___, they set

Most actually will set___

A

Setting Time

Snap set is desirable –

Newest materials havesnap set – setting begins in the mouth

You want material to have a good working time and then boom, they set

Most actually will set gradually

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Flow during working time

__ ___ Flow Test, mm

Product 25 sec End of WT

Impregum Penta 11.4 9.9

Impregum Soft 14.3 7.9

Aquasil Ultra Xtra 12.6 2.1

Shark Fin Test: To measure the Flow

After (not at end) the WT, you don’t want to see ___ ___

Impregum Penta is good bc it has low at the end of the working time and then right after that the flow drops really fast

A

Flow during working time

Shark Fin Flow Test, mm

Product 25 sec End of WT

Impregum Penta 11.4 9.9

Impregum Soft 14.3 7.9

Aquasil Ultra Xtra 12.6 2.1

Shark Fin Test: To measure the Flow

After (not at end) the WT, you don’t want to see any flow

Impregum Penta is good bc it has low at the end of the working time and then right after that the flow drops really fast

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Factors Which Affect Setting

  • ___r contamination
  • ___
  • Contamination by ___ ___

Get latex on tooth and that gets onto tray

A

Factors Which Affect Setting

  • Water contamination
  • Temperature
  • Contamination by latex gloves

Get latex on tooth and that gets onto tray

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Properties after Setting

Working and setting times

short __ < __longer

Dimensional change: Shrinkage

least __ < __ more

A

Properties after Setting

Working and setting times

short PE < AS longer

Dimensional change: Shrinkage

least AS < PE more

17
Q

Problems with Impressions and their Causes

Voids – poor ___of tissues , improper use of ___

Pulls –___ __ ___, tray ___

Tears – poor ___ ,___ ___ of tray

Drags – improper ___

Ledges – seating tray __ ___, insufficient ___ material

Blending of Light Body and HB – ___ contamination, relining ___ material

A

Problems with Impressions and their Causes

Voids – poor retraction of tissues , improper use of syringe

Pulls – working time exceeded, tray moved

Tears – poor retraction, early removal of tray

Drags – improper seating

Ledges – seating tray too fast, insufficient wash material

Blending of Light Body and HB – latex contamination, relining wash material

18
Q

Elastic Recovery

___ distortion (permanent deformation) when ___ from mouth

highest recovery __ (Better) > __ less recovery

How resistant are materials to the permanent deformation

Range: You want something over ___%

Light-body – 98.3 to 99.8%

Heavy-body – 98.0 to 99.8%

A

Elastic Recovery

Less distortion (permanent deformation) when removed from mouth

highest recovery AS (Better) > PE less recovery

How resistant are materials to the permanent deformation

Range: You want something over 99.5%

Light-body – 98.3 to 99.8%

Heavy-body – 98.0 to 99.8%

19
Q

Incorrect Manipulation

Failure to use ___ ___ or allow it to ___ adequately ––>___

Material doesn’t necessarily stick to the tray

A

Incorrect Manipulation

Failure to use tray adhesive or allow it to dry adequately – distortion

Material doesn’t necessarily stick to the tray

20
Q

Properties after Setting

• Dimensional change - AS < PE

Stability over time allows for accurate ___ ___

Are second pours OK?

Too much dimensional changefor __

OK for __

A

Properties after Setting

• Dimensional change - AS < PE

Stability over time allows for accurate second pours

Are second pours OK?

Too much dimensional changefor PE

OK for AS

21
Q

Strain in Compression (Flexibility)

  • Ease of ___ from mouth
  • AS ____ PE

Range:

Light-body – 3.1 to 6.8%

Heavy-body – 1.5 to 6.7%

Lower number–> ____

A

Strain in Compression (Flexibility)

  • Ease of removal from mouth
  • AS similar to PE

Range:

Light-body – 3.1 to 6.8%

Heavy-body – 1.5 to 6.7%

Lower numberà stiff

22
Q

Tear Energy

  • Resistance to ___ on ___ from mouth
  • high ___ > ___ > ___ or ___low

Range:

Light-body – 236 to 1140 J/m2

Heavy-body – 446 to 1024 J/m2

When you remove impression it will tear

A

Tear Energy

  • Resistance to tear on removal from mouth
  • high PE > AS > alginate or agar low

Range:

Light-body – 236 to 1140 J/m2

Heavy-body – 446 to 1024 J/m2

When you remove impression it will tear

23
Q

Criteria – Tray Material

  • Ease of ___
  • Lack of ____
  • Flows at ___
  • Blends with ___ ___ (so you don’t have separation bw light body and heavy body)
A

Criteria – Tray Material

  • Ease of mixing
  • Lack of stickiness
  • Flows at seating
  • Blends with light body (so you don’t have separation bw light body and heavy body)
24
Q

Criteria – Light body

  • ___/___
  • ____ (when you put it on tooth you don’t want it to flow down, you want it to stay there)
  • Color ____ for ease of reading margins
  • Lack of ___/___
A

Criteria – Light body

  • Viscosity/Flow
  • Stackability (when you put it on tooth you don’t want it to flow down, you want it to stay there)
  • Color contrast for ease of reading margins
  • Lack of voids/porosity
25
Q

Imprint 4 (3M ESPE) – Clinical Rating __%

>___set – active self-____ feature

> ___setting time – 1:15 – 2:30 min

> Good __ in subgingival areas

> Colors offer good ___

A

Imprint 4 (3M ESPE) – Clinical Rating 97%

> Snap set – active self-warming feature

> Quick setting time – 1:15 – 2:30 min

> Good detail in subgingival areas

> Colors offer good contrast

26
Q

Aquasil Ultra Smart Wetting Impression Material (DENTSPLY Caulk) – Clinical Rating _%

> Remarkable ___ in ___ environment

> Excellent ___ to tearing in thin areas

> LB ___ well, HB provides ___ for tray

> Pleasant __ and ___

A

Aquasil Ultra Smart Wetting Impression Material (DENTSPLY Caulk) – Clinical Rating 93%

> Remarkable accuracy in moist environment

> Excellent resistance to tearing in thin areas

> LB stacks well, HB provides rigidity for tray

> Pleasant flavor and scent

27
Q

Dynamix speed (Heraeus) – Clinical Rating __%

> ___mixing with excellent results

> Cartridges easy to ___

> Short mixing tips minimize ___

> Will mix ___ of impression materials

A

Dynamix speed (Heraeus) – Clinical Rating 96%

> Fast mixing with excellent results

> Cartridges easy to change

> Short mixing tips minimize waste

> Will mix variety of impression materials

Biomaterials (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions