Unit dosage dispenser for dental impression materials

Claim 1

Apparatus for dispensing a unit dosage of elastomeric impression material for taking an impression in the oral cavity under aseptic conditions in the preparation of a dental restoration comprising: a syringe having at least two elongated storage compartments laterally spaced apart with each compartment having a discharge end; means for simultaneously applying pressure upon the opposite end of each compartment for discharging material from the discharge end of each compartment in common; a nozzle assembly having a single nozzle for dispensing the materials discharged from said syringe, a head for coupling said nozzle assembly to said syringe, and a static mixing element in said nozzle for intermixing the materials fed to said nozzle; a first impression material of relative low viscosity located in a first one of said storage compartments; a second impression material of a substantially higher viscosity relative to the viscosity of said first impression material disposed in tandem with said first impression material in said first storage compartment; a curing composition for said first and second impression materials located in a second storage compartment; and means for separating said first and second impression materials for minimizing intermixing thereof during storage prior to use and during the sequential discharge of each material through said first storage compartment until one of said two impression materials is completely discharged from said storage compartment.