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Dimensional stability of reversible hydrocolloid impressions immersed in selected disinfectant solutions.

Full-arch reversible hydrocolloid impressions of a dentoform arch (Columbia) containing an extracted first premolar prepared for a distal-occlusal inlay were immersed for 30 minutes in selected disinfectant solutions. The impressions were poured with die stone, and three cast inlays were fabricated on each die. The results of this procedure indicate that a 30-minute immersion of reversible hydrocolloid impressions in diluted solutions of iodophor, commercial hypochlorite, or 2% acidic glutaraldehyde does not adversely affect the dimensional stability of these impressions.

Colloids↗

An impression procedure for the severely atrophied mandible.

A procedure is described for the final impression of the severely atrophied mandible. The final impression is developed by use of open- and closed-mouth procedures. The objective is to develop a physiologic impression with maximum support of both hard and soft tissues.

Atrophy↗

A procedure for making fixed prosthodontic impressions with the use of preformed crown shells.

Void-free impressions of tooth preparations for fixed prosthodontics are essential for accurately fitting restorations; however, commonly used impression methods are arduous and time-consuming. A procedure has been developed in which an impression is made in a preformed temporary crown shell for each tooth preparation and then a final over impression is made. The result is an atraumatic and uncomplicated complete-arch impression that incorporates an accurate impression of each prepared tooth.

Crowns↗

An alternative method for direct custom tray construction using a visible light-cured resin.

The use of a properly made tray is highly desirable for impression making. To avoid the extra time required for tray fabrication, the alternative techniques of the putty wash or "reline" technique and intraoral fabrication of a custom tray by relining a stock tray with self-curing resin are proposed. This article illustrates a new technique of direct custom tray fabrication used for impression making for fixed prosthodontics. The proposed technique allows the direct fabrication of custom trays with light-cured resin and is time-saving, efficient, and inexpensive.

Acrylic Resins↗