Being a dinosaur from that era of impression taking I'll attempt an explanation. One step would be placing the heavy body/ putty in the tray and syringing the light body/wash around the preps and allowing both materials to polymerize in the tray. Two-step is to take the putty/heavy in the tray and taking an impression prior to tooth preparation. After tooth perpetration two vent holes are placed into the putty impression on opposite sides of the prepared teeth. The tray is reseated on the prepared teeth and wash/light body is syringed into one of the vent holes and allowed to extrude out the other. Alternatively the wash could be placed into the prepared teeth area and the seated allowing the excess to extrude through the vents. Supposedly an improvement over poly sulfide (rubber base) impressions.
Last edited by OhioDMD; 04-17-2012 at 05:23 PM.