A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
A61C 3/025 (2006.01) B24C 5/04 (2006.01) B24C 7/00 (2006.01)
Patent
CA 2463184
The invention relates to apparatuses for treating surfaces of teeth by using a mixture of pressurised gas, preferably pressurised air, and abrasive particles such as particles of aluminium oxide. A first apparatus comprises a chamber having at least a primary inlet and preferably an additional inlet and also having an outlet. The primary inlet establishes a vortex within the chamber and the additional inlet fluidises the abrasive particles lying in the bottom of the chamber. A second apparatus comprises a handpiece with a nozzle having an outlet provided with notches or holes. The notches or holes constitute additional discharge openings apart from an orifice in the nozzle. Both of the apparatuses ensure that the pressure needed for the treatment and the amount of abrasive particles for the treatment is minimised as much as possible.
L'invention concerne des appareils destinés à traiter la surface des dents au moyen d'un mélange de gaz pressurisé, de préférence de l'air pressurisé, et des particules abrasives, telles que des particules d'oxyde d'aluminium. Un premier appareil comprend une chambre dotée d'au moins une première entrée et, de préférence, d'une entrée additionnelle et d'une sortie. La première entrée forme un tourbillon dans la chambre et l'entrée additionnelle fluidise les particules abrasives déposées au fond de la chambre. Un second appareil comprend un outil associé à une buse comportant une sortie dotée d'encoches ou d'orifices. Les encoches ou les orifices constituent des ouvertures de décharge additionnelles, en plus d'un orifice dans la buse. Ces deux appareils garantissent que la pression et que la quantité de particules abrasives nécessaires au traitement soient réduites au maximum.
Gowling Lafleur Henderson Llp
Sandman Aps
LandOfFree
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