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Inhibited or Slow Setting
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Visual Appearance: Impression not completely set. Shiny, no detail of site.
Result: Inadequate surface detail on stone cast, poor fitting restorations.
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| CAUSE |
SOLUTION |
For Vinyl Polysiloxane Materials
Sulfur inhibition due to contact of latex gloves with tissue/tooth/retraction material or impression material. |
- Wear gloves proven not to contain traces of sulfur.
- If contamination is suspected, scrub affected area with diluted hydrogen peroxide.
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Residues from custom temporary or provisional cements (acrylics) present. |
- Do not use impressions already used to fabricate the temporary restoration.
- Fabricate the temporary crown or bridge after final impression has been made.
- Remove air-inhibited layer on the exposed surface with an alcohol wipe before making final impression.
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For Polyether Materials
Substances with pH < 4 inhibit setting reaction, most commonly by the contact with acidic retraction materials and hemostatic agents containing epinephrine or ferric sulfates. |
- Use retraction materials having pH≥4.
- Select retraction materials and hemostatic agents not containing these chemicals.
- Rinse, remove, dilute hemostatic solution with water spray and suction. Dry before taking the impression.
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For VPS and PE Materials
Expired impression material does not set properly, elastomeric properties are insufficient. |
- Check expiration date of impression material.
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Inadequate Mix |
- Bleed before applying mix tip to ensure even dispensing.
- Use mix tip according to manufacturer's instruction for use.
- Ensure mix tip is correctly attached.
- When using hand-mix materials ensure correct mixing ratio and thorough mix of catalyst and base paste.
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Click to enlarge
Inadequate Mix
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Customer Care
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