Elastomeric Impression Materials Flashcards
THE DENTAL ADVISOR
In vitro Studies
> Biomaterials
> Microbiology
Clinical Marketing Studies
> Restorative materials – placement andlong-term
> Infection control products
> Equipment
THE DENTAL ADVISOR
In vitro Studies
> Biomaterials
> Microbiology
Clinical Marketing Studies
> Restorative materials – placement and
long-term
> Infection control products
> Equipment
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!
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!
Common Names: Types of Impression Materials that are available
Addition ____ – ___ ___ ___(VPS): 60%
____ 30%
___ – ___ ___ ___e – ___
Common Names: Types of Impression Materials that are available
Addition silicone – poly vinyl siloxane (VPS): 60%
Polyether: 30%
PEVS – polyether vinyl siloxane – hybrid
Consistencies
- ___, ___ ___, ___,___
- ___
- ____
- ___
- ___
Can be fast set or regular set
Types of Packaging
Consistencies
- Light, extra light, syringe, wash
- Medium
- Monophase
- Heavy
- Putty
Can be fast set or regular set
Types of Packaging
Impression Techniques
- ___/___ (1 step)
- ___/___ (2 step)
- ___/___ (___/___)
- ____
Putty wash popular in Europe
Heavy/Light popular in US
Polyether is monophase
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
Mixing Options
Hand-mixed – ___, ___
Not used much anymore
Auto-mixed – ___, ___-___ ___ (gun)
90%
Motor-mixed – ___
If doing a large number of impressions everyday
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
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
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
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
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
Auto-mixed Cartridge
__- & ___ ___ Cartridges
___ ___ & ___ ___
Intraoral Tips: For wash around your prep
Meanwhile, assistant is mixing the putty
Auto-mixed Cartridge
50- & 75-mL Cartridges
Dispensing Guns & Mixing Tips
Intraoral Tips: For wash around your prep
Meanwhile, assistant is mixing the putty
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
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
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
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
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
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
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___
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
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
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
Factors Which Affect Setting
- ___r contamination
- ___
- Contamination by ___ ___
Get latex on tooth and that gets onto tray
Factors Which Affect Setting
- Water contamination
- Temperature
- Contamination by latex gloves
Get latex on tooth and that gets onto tray
Properties after Setting
Working and setting times
short __ < __longer
Dimensional change: Shrinkage
least __ < __ more
Properties after Setting
Working and setting times
short PE < AS longer
Dimensional change: Shrinkage
least AS < PE more
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
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
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%
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%
Incorrect Manipulation
Failure to use ___ ___ or allow it to ___ adequately ––>___
Material doesn’t necessarily stick to the tray
Incorrect Manipulation
Failure to use tray adhesive or allow it to dry adequately – distortion
Material doesn’t necessarily stick to the tray
Properties after Setting
• Dimensional change - AS < PE
Stability over time allows for accurate ___ ___
Are second pours OK?
Too much dimensional changefor __
OK for __
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
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–> ____
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
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
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
Criteria – Tray Material
- Ease of ___
- Lack of ____
- Flows at ___
- Blends with ___ ___ (so you don’t have separation bw light body and heavy body)
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)
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 ___/___
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
Imprint 4 (3M ESPE) – Clinical Rating __%
>___set – active self-____ feature
> ___setting time – 1:15 – 2:30 min
> Good __ in subgingival areas
> Colors offer good ___
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
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 ___
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
Dynamix speed (Heraeus) – Clinical Rating __%
> ___mixing with excellent results
> Cartridges easy to ___
> Short mixing tips minimize ___
> Will mix ___ of impression materials
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
