EcoPression VPS Putty · Fast Set

• Putty — The tray half of a putty-wash pair, kneaded by hand rather than pressed from a cartridge. Because it is hand-mixed, a review notes that polyethylene or vinyl gloves are named in place of latex for handling it.
• Heavy Body — Goes in the tray and carries the wash, where the light body records the preparation.
• Medium Body — One viscosity that serves as both the tray and the syringe material.
• Light Body — The thin one, syringed around the preparation.
• Monophase — One cartridge and one viscosity instead of a pair, so there is no second material to inject.
• VPS Kits & Sets — More than one viscosity of one line in a single box, in place of a single cartridge.

Wetting: this material is hydrophobic by nature, so surfactants are added to it and the result is sold as hydrophilic. A hydrophilic impression material flows into moist areas easily and records the tissues accurately; wetting is measured as the contact angle between a drop of water and the set material. A review notes that despite the claims of improved hydrophilicity, accurate impressions are obtained in dry conditions.

What stops it setting: sulfur from natural latex gloves can contaminate the platinum catalyst and hold up the reaction, and the same happens where the material sets against a latex rubber dam. Polyether and polysulfide materials leave a film on the teeth that inhibits it, so an impression taken straight after one of those comes out incompletely set.

Disinfection: ten minutes of immersion in 0.5 percent sodium hypochlorite gives intermediate-level disinfection without affecting the dimensional stability of this material, and 30 minutes in glutaraldehyde leaves it stable too. A warning has been issued against immersion disinfection for hydrophilic addition silicone impressions, because of the possibility of distortion.