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Voids on the Margin

Visual Appearance: Voids/holes on margin of the prepared teeth. Incomplete margin.

Result: The fit and function of the final restoration may be compromised. Short crown margins and/or open margins.

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Void Caused by Syringe Technique

 

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Trapped Air or Moisture
CAUSE SOLUTION

Air trapped in intraoral syringe.

  • Properly bleed filled elastomer syringe.
  • Keep tip immersed in material when loading syringe.
  • Do not stop when in the middle of loading syringe.

Air trapped while filling impression tray.

  • Keep mix tip immersed in tray material while filling the tray.

Improper syringe technique.

  • Keep syringe tip immersed in wash material to avoid entrapping air.
  • Wiggle and stir while syringing. Push material forward.

Inadequate coverage of marginal area with light body impression material.

  • Use wash material liberally on preparation and abutments.

Blood and saliva contamination around prep.

  • Use good moisture control technique. Rinse and dry prep area before taking the impression.
  • Stop bleeding by using appropriate retraction technique and hemostatic agent. Leave cord in sulcus until no blood or saliva are present before syringing the light body impression material. Consider two-cord retraction to displace tissue and control fluids.
Tray not seated straight.
  • Insert impression tray straight.
  • Ensure that correct centric bite is attained when using dual arch impression trays.
Exceeding the working time.
  • Follow manufacturer’s working time specifications.
  • Choose material with longer working time.

Impression material stored at elevated temperature.

  • Store impression material at room temperature.



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