Hydraulic and Hydrophobic Impressions
(Continued)The patient opened and the impression was held against the opposing arch. A small amount of 90-Second Flexi Velvet (J. Morita), a thixotropic, low viscosity material, was injected into each Blue Velvet impression of each tooth prepared for an inlay. The patient then closed back down into the impression and held that position until the material had set (Figure 15, 16, 17, and 18).
 Figure 15 |
 Figure 16 |
 Figure 17 |
 Figure 18 |
One advantage of using the hydraulic and hydrophobic impression technique was that it reproduced the preparations with a very high degree of accuracy. The hydraulic pressure generated when the patient closed into the 90-Second Flexi Velvet propelled the low viscosity material into every "nook and cranny" of the preparations. If some of your finish lines are subgingival, the hydraulic pressure will propel the 90-Second Flexi Velvet into the sulcus which will reproduce the finish lines exactly as well as all of the root anatomy in the sulcus. This is because the 90-Second Flexi Velvet is propelled under so much hydraulic pressure that it completely fills the sulcus and reproduces the entire anatomy of the root contained within the sulcus. Because you are using a closed mouth, double arch impression technique, the master and opposing casts will be articulated with great accuracy. All of this translates into highly accurate finished restorations requiring minimal adjustments. In fact, most of our cases drop into place and require almost no adjustment.
A second advantage of the hydraulic and hydrophobic impression technique is that it is very comfortable for the patient. You do not have to pack cord or place hemostatic agents. You can proceed directly from preparing the teeth to making the final impression. This. also saves chair time because you do not have to wait for the gingival tissue to stretch out and you don't have to wait for the gingival tissue to finally stop bleeding.
With the hydraulic and hydrophobic impression technique, we were able to achieve a highly accurate impression with maximal patient comfort. We also used materials which set rapidly, enabling us to make the final impression in under three minutes.
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