Nozzle system, powder blasting device and method for using a nozzle system

A nozzle system for a powder blasting device, namely a powder jet device for dental treatment, comprising

• a first nozzle element for transporting a powder-gas mixture stream along a transporting direction and
• a second nozzle element, wherein the second nozzle element surrounds the first nozzle element such that at least one channel is formed between the first nozzle element and the second nozzle element, wherein the at least one channel is provided for transporting a liquid stream, wherein the first nozzle element and the second nozzle element are arranged such that in operation the powder-gas-mixture stream ejected by the first nozzle element is encased by the liquid stream ejected by the at least one channel via an output surface for forming an output stream of the nozzle system,
• wherein the first nozzle element has an acceleration part having a first cross section and a spreading part having a second cross section, wherein the spreading part is arranged downstream of the acceleration part, characterized in that the second cross section is larger than the first cross section,
• wherein the first nozzle element and the second nozzle element terminate at a front end of the nozzle system or, wherein the first nozzle element protrudes at the front end of the nozzle system, wherein the output surface has a third cross section, wherein the third cross section has a size between 0.3 and 0.4 mm2, such that the liquid stream is ejected from the output surface such that the powder jet device is encased by droplets.