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Lack of Impression Detail
Visual Appearance: Muted detail reproduction.
Result: Crowns may be too tight, or loose, and not fit correctly.
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Impression material stored at elevated temperature. |
- Store impression material at room temperature.
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Impression material stored at too low a temperature (prolongs the setting reactions, changes viscosity and requires exceptionally high extrusion forces for automix materials). |
- Keep impression material at a temperature of 18°C/64°F at least one day prior to use.
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| Thick blood/saliva pooled around prep. |
- Remove blood and saliva prior to making impression.
- Use 2-step impression technique.
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| Inadequate retraction of sulcus around prep. |
- Use good retraction technique, with proper moisture control.
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Exceeding the working time. |
- Follow manufacturer’s working time specifications.
- Choose material with longer working time.
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| Inadequate disinfection effects surface quality (detail reproduction) and dimensional stability. |
- Use water-based disinfectants according to FDA guidelines.
- Follow manufacturer’s instructions for use.
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For Polyether Materials
Substances with pH < 4 inhibit setting reaction, most commonly by 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 and dilute hemostatic solution from the preparation with water spray and suction. Dry before taking the impression.
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Incorrect storage conditions of the final impression affects surface quality (detail reproduction) and dimensional stability. |
- Rinse polyether impressions with water and blow dry before sending it to the lab.
- Do not send the impression in the same bag as an alginate impression to the lab.
- Avoid storing impressions in sealed bags.
- Store the impression at room temperature away from direct sunlight.
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Customer Care
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