No burn-through of wash material on preparation or adjacent teeth

No tearing of the wash from the putty around the preparation

Detailed and complete margins

No tooth contact with tray; impression centered on tray

Tray adhesive applied properly

Properly mixed material; no streaking

Strong bond between putty & wash materials; no signs of separation

No voids; full, smooth wash material coverage

Inadequate retraction of sulcus around the preparation

Moisture or bleeding around the preparation

Too much time between mixing and seating

Rocking of tray to get proper seating

Tray movement after it has been seated

Inadequate retraction of sulcus around the preparation

Moisture or bleeding around the preparation

Too much time between mixing and seating

Improper syringing technique around preparation; keep tip immersed and use stirring motion

Contamination of vaseline or balm used on syringe or lips

Glove contamination

Outdated/expired impression materials

Wrong size/shape tray used

Tray not seated properly

Dimple in putty material is too small; must be deep and include teeth adjacent to all preparations

Tray dislodges before material is fully set

Not enough wash material

Tray seated too quickly/forcefully

No/not enough tray adhesive

Incompatible/wrong manufacturer’s adhesive

Inadequate drying time for adhesive

Outdated/expired tray adhesive

Disinfectant residue

Dimple in putty material is too small; must be deep and include teeth adjacent to all preparations

Not enough wash material

Tray seated too quickly/forcefully

Premature removal of tray from the mouth; inattention to recommended times

Inadequate retraction of sulcus around the preparation

Moisture or bleeding around the preparation

Improper amounts of base and catalyst

Inadequate mixing

Glove contamination