Abstract: A filter canister assembly for receiving waste from a dental cuspidor includes a canister of generally conventional configuration, with an open upper end fitted with a canister closure, the canister containing a closed disposable filter basket. A hand grip on the closed filter allows a dental technician to hold and dispose of the filter basket without contacting waste material contained within the filter.

Abstract: A filter canister assembly for receiving waste from a dental cuspidor includes a canister of generally conventional configuration, with an open upper end, fitted with a canister closure which engages with the upper end of the canister and which is secured to a disposable filter configured to fit within the canister. Embodiments are described wherein the canister closure is disposable and is permanently attached to the disposable filter; wherein the canister closure is snapped together with the filter; and wherein the filter itself has an annular ledge which seats with different sizes of canister, with the closure snapped into the upper end of the filter.

Abstract: Dental syringe covers are described in several different forms. In one form the syringe cover is of a soft, rubbery material at least at its tip, the tip being formed into a one-way valve by a duckbill construction so that fluid cannot enter from outside. In all embodiments the syringe cover, tapered in shape, fits tightly over the metal dental syringe so that no liquid from the syringe can flow backward over the surface of the syringe. Another feature is a longitudinal gap between the syringe tip and the tip of the syringe cover. The gap functions to isolate the syringe tip from the exterior environment as well as to improve the stream of air, water or air/water mix delivered from the syringe. Preferably the syringe covers include an enlarged generally bell-shaped feature at the end opposite the tip, providing a surrounding cover or sheath for a nut or other fastener typically present at the base end of the metal syringe.

Abstract: The present invention comprises a sheath for protecting a dental syringe and for preventing residual cross-contamination between successive patients. Means are provided for preventing contaminants from being drawn back into the syringe after application has ceased.

Abstract: The present invention comprises a sheath for protecting a dental syringe and for preventing residual cross-contamination between successive patients. Means are provided for preventing contaminants from being drawn back into the syringe after application has ceased.