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Impression Materials (Completely Inelastic (Zinc Oxide Eugenol
Primary…
Impression Materials
Completely Inelastic
Impression Compound
Where
- Non-retentive areas (Convex)
- Edentulous
Why
- Advantages
- Making personalized trays
- Cheap
- No distortion on storage (in room temp 25deg)
- Disadvantage
- Hard to remove from tray
- Takes long time for heat to travel
- Requires active pressure to cause flow
How
- Impression methodology
- Remove impression when it is homogeneously cold
- Portions of impression can be reshaped individually
- Can heat using flame (localized)
- Water bathe more homogenous
- Before putting into mouth (put in water)
- Residual stress
- Casting time
- Environment matters
- Can wait 1wk
- ASAP
What
- Thermosetting
- 60deg: Shaping
- Room temp: Stable
- Low flowability
- Don't want flesh pushed again bone
- Soft tissue moves out of shape
Zinc Oxide Eugenol
- Primary Use:
- Possible Uses:
- Temp filling
- Temp cement
- Surgical dressing
- Cavity liner
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Impression Material
- Secondary impression
- Primary taken use
- Impression compound
- Acrylic tray
- Pros:
- Inexpensive
- High surface detail
- Low viscosity
- Low dimensional change
- Cons:
- Messy
- Non-elastic
- Requires tray
Properties:
- High solubility
- Low adhesion
- Low strength
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Impression Plaster
Composition
- Plaster of Paris
- Modifiers
- Potato Starch
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Residual stress
- Skin cold
- Inner hot
- Inner flowable
- Impression bend inwards |/_\|
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