With the Alfa tray, the assistant does not have to hold the tray in place while the alginate is setting. This helps speed up the process by allowing the operator to clean up the mixing bowl and put away the alginate while the impression is setting.
Another great impression material is the new alginate-replacement material, Status Blue from Zenith/DMG and Position Penta from 3M ESPE.
These are vinyl polysiloxane materials that cost about the same as alginate, but can be poured multiple times. The assistant then pours up the maxillary impression with a quick-set stone such as TAK Earth Stone , Snap Stone from WhipMix, or Speed Stone from Discus Dental.
She then places a damp paper towel over the tray to maintain the integrity of the alginate and measures out the next pour of stone.
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