Patent ID: 6935860
Filing Date: 2005-08-30
Classification: A61C,B24C

Abstract:
1. An apparatus for dental abrasive treatment of teeth, said apparatus comprising a hand piece, a means for establishing a flow of pressurised gas, and a chamber for mixing said pressurised gas with abrasive particles, said chamber having a top and a bottom, and sidewalls between said top and said bottom, said sidewalls having a circular cross-section and the bottom being intended for containing an amount of abrasive particles, and said chamber comprising a primary inlet for the pressurised gas, and an outlet for a mixture of pressurised gas and abrasive particles, the outlet extending to the exterior of the chamber, and the inlet extending along a tube or a pipe from outside of the chamber into the interior of the chamber and having an orifice directed tangentially to the circular cross-section for creating a vortex of particles in the chamber, and said chamber furthermore comprising an additional inlet for pressurised air, wherein the outlet has an orifice positioned in a vortex region of the chamber for extraction of particles directly from the vortex to the exterior.