Dental abrasive blasting or jet apparatus

A dental abrasive blasting or jet apparatus, comprising:

• a powder reservoir for storing a dental powder which in common with a gaseous carrier medium is supplied via a powder supply line to a nozzle arrangement of a handpiece together with a fluid which is supplied via a separate fluid supply line, the handpiece being operatively connected with the apparatus;
• a separate fluid receptacle or bottle which is exchangeably arranged on the exterior of the apparatus for storing a flushing or rinsing fluid which is provided for being selectively supplied to the nozzle arrangement of the handpiece separately from or in common with a supply of the mixture of the dental powder and the gaseous carrier medium;
• a branch line of said fluid supply line which is adapted for being connected to said separate fluid receptacle or bottle via a change-over directional valve which is adapted for being selectively switched to a control position in which the flushing or rinsing fluid is supplied to the jet or nozzle arrangement of the handpiece via a junction at a position downstream of said change-over directional valve at which said branch line further extends to a portion of said fluid supply line which terminates in said nozzle arrangement of the handpiece;
• and
• a suction pump which is arranged in said branch line at a position upstream of said change-over directional valve, the suction pump being switched-on when said change-over directional valve is adjusted to said control position so that the flushing or rinsing fluid will be sucked-off from said separate fluid receptacle or bottle for being supplied to said nozzle arrangement of the handpiece via said interconnected portion of the fluid supply line downstream of said change-over directional valve which then will interrupt said upstream portion of the fluid supply line.