Ferton Holding S.a.

Alexandre Sierro

Lutz Beerstecher

A dental handpiece for use with a device for treatment of teeth by a jet of an abrasive powder mixed with air and water has a first one-way valve in a first supply line for pressurised air connected to an integrated powder container of a gripping sleeve and at least a first filter is further provided in this first supply line at a position upstream of the first one-way valve and downstream of a connecting end where the supply line connects with a common supply for air and water which is provided at the rearward end of the gripping sleeve. A second filter is provided at a position downstream of the first one-way valve in the first supply line and a second one-way valve is provided in a second supply line for water together with a third filter. The first and third filters each have a fine-meshed screen body. The second filter has a microporous sintered metallic body or a microporous plastic body.

Dental handpiece

A nozzle piece for a handpiece of a dental abrasive blasting apparatus comprises a gripping member for connection with a head portion of the handpiece whereby the gripping member has a closed surface with a thusly defined curvature on its upper and underneath visual surfaces that discharge openings of two discharge nozzles of the nozzle piece are located close to a visual plane which by definition includes a longitudinal axis of the handpiece and outside of which are located the crossing points of two supply ducts with a common central axis of the two discharge nozzles, whereby the two supply ducts extend in parallel and inclined with respect to the longitudinal axis of the handpiece for defining an inclined discharge angle of a working jet of the nozzle piece.

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Celigny, Switzerland

Alexandre Sierro