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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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Lack of Impression Detail

 

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Exceeding the Working Time

 

CAUSE SOLUTION

Impression material stored at elevated temperature.

  • Store impression material at room temperature.

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.
Thick blood/saliva pooled around prep.
  • Remove blood and saliva prior to making impression.
  • Use 2-step impression technique.
Inadequate retraction of sulcus around prep.
  • Use good retraction technique, with proper moisture control.

Exceeding the working time.

  • Follow manufacturer’s working time specifications.
  • Choose material with longer working time.
Inadequate disinfection effects surface quality (detail reproduction) and dimensional stability.
  • Use water-based disinfectants according to FDA guidelines.
  • Follow manufacturer’s instructions for use.
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.

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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Poor Retraction and Syringing Technique

 

 



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