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COMMON SCENARIOS AND APPROPRIATE RESULTS IN TAKING IMPRESSIONS

TROUBLESHOOTING IMPRESSIONS
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.

TROUBLESHOOTING IMPRESSIONS
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.

TROUBLESHOOTING IMPRESSIONS
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

TROUBLESHOOTING IMPRESSIONS
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.


TROUBLESHOOTING IMPRESSIONS
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.

TROUBLESHOOTING IMPRESSIONS
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.


For More Information on Impression Taking, Click Here.
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