Do you have any suggestions for a quick setting, stiff impression material for final pick-up impressions of implant abutments?

Yes, Impregum Penta Soft Quick Step (3M ESPE) is a quick setting version of their proven polyether impression material. Polyethers are known for their stiff, accurate, and water-friendly (hydrophilic) properties. The impression material is sold in three viscosities: light, medium, and heavy. The medium body is used in a monophase technique. Heavy- and light-bodied materials are to used in a one-step tray and wash technique. The intraoral working time is one minute and intraoral setting time is three minutes. The Pentamix mixing technique (to be used with the heavy and medium viscosities) ensures an even, consistent mix of material.