Parkell's Cinch Vinyl Polysiloxane impression material provides accurate crown and bridge impressions and an economical option for less demanding procedures that often use alginate substitutes.Parkell's Cinch Vinyl Polysiloxane impression material provides accurate crown and bridge impressions and an economical option for less demanding procedures that often use alginate substitutes. • Hydrophilic • Use as a final impression material or an alginate substitute • Proprietary formula minimizes model making times