9 Most Common Fixed Impression Problems: What To Look For

Inadequate Margins

Probable Causes

  • Inadequate retraction of sulcus around the prep
  • Moisture or bleeding around the prep
  • Too much time between mixing and seating
  • Rocking of tray to get proper seating
  • Tray movement after it has been seated

Voids

Probable Causes

  • Inadequate retraction of sulcus around the prep
  • Moisture or bleeding around the prep
  • Too much time between mixing and seating
  • Improper syringing technique around prep; keep tip immersed and use stirring motion

Debonding

Probable Causes

  • Contamination of vaseline / balm used on syringe or lips
  • Glove contamination
  • Outdated / expired impression materials

Contact With Tray

Probable Causes

  • Wrong size / shape tray used
  • Tray not seated properly

Ledges

Probable Causes

  • Dimple in putty material is too small; must be deep and include teeth adjacent to all preps
  • Tray dislodges before material fully set
  • Not enough wash material
  • Tray seated too quickly / forcefully

Inadequate Tray Adhesive

Probable Causes

  • No / Not enough tray adhesive
  • Incompatible / Wrong manufacturer's adhesive
  • Inadequate drying time for adhesive
  • Outdated / expired tray adhesive
  • Disinfectant residue

Burn Through of Wash Material

Probable Causes

  • Dimple in putty material is too small; must be deep and include teeth adjacent to all preps
  • Not enough wash material
  • Tray seated too quickly / forcefully

Tearing of Wash Material

Probable Causes

  • Premature removal of tray from the mouth; inattention to recommended times
  • Inadequate retraction of sulcus around the prep
  • Moisture or bleeding around the prep

Streaking

Probable Causes

  • Improper amounts of base and catalyst
  • Inadequate mixing
  • Glove contamination

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