H & H Perfectim Impression System
Hydraulic & Hydrophobic
Continued
Hydraulic & Hydrophobic Impression Technique
Immediately following a crown preparation, a primary impression is taken with either 30 Second, 90 Second, or Universal Blue Velvet. Then either 30 Second or 90 Second Flexi-Velvet is injected into the impression of the prepped tooth. The FLEXI-VELVET material is hydraulically moved into the sulcus, displacing the gingival tissue and oral fluids. Since the FLEXI-VELVET is hydrophobic, it does not absorb moisture, and sets without distortion. These two occurrences are described as hydraulic and hydrophobic, or the H&H technique, which make it possible to achieve accurate impressions without the use of retraction cord. This technique was developed to improve patient comfort while obtaining accurate results in an efficient manner.
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Figure 1. Maxillary right first molar prepared for a full crown with subgingival margins. |
Figure 2. 30 Second, 90 Second, or Universal Blue Velvet impression material is extruded into a 3-in-1 impression tray. |
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Figure 3. Impression material and tray is placed over the prepared tooth. Have the patient occlude for 30 seconds. |
Figure 4. Open while holding impression on the opposing arch. Flexi-Velvet wash is syringed onto the air dried impression of the prepared tooth. Have the patient close for 90 seconds. |
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Figure 5. The impression is removed from the mouth and visually inspected for completeness. |
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