Innovative Crown & Bridge Technique --
The H&H Impression Technique

Continued

Discussion

The H&H Technique produces an accurate impression without the placement of retraction cord, hemostatic agents or use of electrosurgery.

These are all integral steps used in conventional impression techniques to gain access to subgingival margins. The H&H Technique relies on hydraulic force to propel the low durometer material into the sulcus. This is made possible by the interaction of the high and low durometer materials combined with the sequential technique of impressing the materials into the prepared site.

In conventional two-step impression techniques, the first impression is taken, set, and removed from the mouth. The impression and tray are then returned to the mouth for the second step of the procedure. If the first step impression is not positioned correctly, the second step impression may be inaccurate. Using the H&H Technique, the first step impression is not removed from the mouth until the final impression is complete. This makes it easier for the patient to relocate MI during the second step of the H&H Technique since the tray is never removed from the mouth.

There are a variety of high durometer materials that can effectively be used with the H&H Technique. A partial list is presented, although this does not represent all available materials. (Table I)

For most clinical situations a working time of 90 seconds is comfortable. However, if multiple crown and bridge units are prepared, a two-minute working time may be desirable.

Examples of low durometer impression materials are presented. This partial list does not represent all available materials. (Table II)

Due to the small amount of low durometer material used in the H & H Technique, a working time of 90 or 30 seconds will afford ample time for delivery of material.

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