1. SLOW-SETTING OR INHIBITED:
Visually: the impression lacks details and has not fully set; often resulting in restorations not fitting.
Reason: For Polyvinyl Siloxane materials, possible cross contamination with sulfur from the latex gloves and materials used to take an impression such as; tissue, tooth, retraction cord, and impression material.
Resolution: Avoid wearing gloves that are known to have traces of sulfur.
| 2. VOIDS ON THE MARGINS:
Visually: Empty spaces and holes form an incomplete margin conceding short and/or open margins making practicality and fit of the restoration unattainable.
Reason: Improper syringe technique
Resolution: Avoid holding air in the syringe tip by maintaining it immersed in wash material.
| 3. TEARING AT THE MARGIN:
Visually: Splits or breaks on the edge of the prep impression that leads to short and/or open margins.
Reason: Inadequate draw back or improper mixing.
Resolution: Follow mixing instructions carefully and consider a two-cord retraction; leaving the pilot cord in the sulcus while taking an imp
|4. FACIAL OR LINGUAL PULLS:
Visually: V-shaped gaps are formed compromising marginal integrity.
Reason: Not enough PVS material is used or movement of the tray after seating.
Resolution: Create a back-flow effect by using a sufficient amount of material and do not reposition tray after seating.
| 5. TOOTH CONTACT WITH TRAY:
Visually: The tray can be seen through the material after taking an impression producing a crown that rocks or does not fully seat.
Reason: Prepared teeth touch with impression tray.
Resolution: Ensure the proper tray size is used with sufficient impression material.
| 6. POOR IMPRESSION DETAIL:
Visually: Minimal marginal features are replicated in the impression; creating tight or loose fitting crowns.
Reason: Too much blood and saliva around the prep.
Resolution: Control the moisture around the prep while maintaining a good retraction.