Abstract: A dental apparatus provides a substantially uniform concentration of abrasive material entrained in a pressurized gas to a desired location substantially irrespective the amount of abrasive material in a pressurized container of the apparatus, and resists clogging by the abrasive material. The apparatus includes a control unit having a container that secures the abrasive material, the abrasive material in the container becoming entrained in pressurized gas received from a dental unit. The concentration of the mixture of entrained abrasive material in pressurized gas is maintained by upwardly directing the flow of the mixture in a first conduit against a cap, a portion of the entrained abrasive material returning to the container, with the regulated mixture of entrained abrasive material in pressurized gas being delivered through a hand piece to the desired location.

Abstract: A syringe sleeve (10) receives a syringe (11) without the syringe (10) dispensing tip (12). After the syringe (11) is received within the sleeve (10), the dispensing tip (12) is affixed to the syringe (11). This causes the end (50) of the sleeve (10) to open and the end (50) to be physically impinged between the tip (12) and the syringe (11). The syringe (11) is thus protected from the operative environment.

Abstract: A syringe sleeve (10) receives a syringe (11) without the syringe (10) dispensing tip (12). After the syringe (11) is received within the sleeve (10), the dispensing tip (12) is affixed to the syringe (11). This causes the end (50) of the sleeve (10) to open and the end (50) to be physically impinged between the tip (12) and the syringe (11). The syringe (11) is thus protected from the operative environment.