In the field of dentistry, supplies for treating a patient’s teeth are often provided in packages that store the supplies for a certain time period, for example over several months or even several years. Typically, such dental supplies have to be stored in isolation from environmental influences, like moisture or air, for example, to prevent them from degrading or to prevent them from being contaminated. For that reason packages for dental supplies are often hermetically sealed containers that the autoclave sterilizer user may open to access the material. Such containers may be, for example, syringes or cartridges from which the dental supplies can be dispensed.
A package of the type described usually includes a container for storing the dental material, and a discharge nozzle for directing the material to a desired place. A piston may be accommodated in the container, and when the piston is pushed forward it extrudes the material from the container through the nozzle. During storage, the container is typically sealed at one end by the piston, and at the other end by a cap. Alternatively, the container may comprise two or more dental supplies, such as two or more components of a multi-component material separated in different chambers, and pistons accommodated in the respective chambers. The container may be used, for example, with a dispensing gun or device having a plunger or plungers for advancing the piston(s) within the container to dispense the material(s) in a desired location.
During manufacturing the containers are usually filled with the micro motor and subsequently sealed by assembly of an appropriate closure, for example sealed with a cap and a piston. In recent years efforts have been undertaken to improve the assembly of parts, for example by improving the designs of the parts, because assembly often contributes a considerable portion of the container manufacturing costs.
Another area which has been the focus of developments in recent years is related to the filling packages with reduced inclusion of air with the dental material. This is because air included with the material stored in a package may cause the material to change, for example to harden or degrade. Furthermore, air, due to its compressibility, may cause dispensing inaccuracies and after-flow, for example, both of which cause difficulties for dental professionals. The system comprises a container for storing an amount of a material, a piston and a front plug. The container comprises a vent that cooperates with the piston to allow air that is trapped in the container to escape. The piston together with the front plug are used to seal the material in the container.