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	Debonding Probable Causes Contamination of vaseline / balm used on syringe or lips Glove contamination Outdated / expired impression materials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Causes No / Not enough tray adhesive Incompatible / Wrong manufacturer's adhesive Inadequate drying time for adhesive Outdated / expired tray adhesive Disinfectant residue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