| abstract |
A nozzle head for the hand piece of a dental prophylactic apparatus comprises a connector having two members that are centered with respect to each other along an axis that is in common with the connecting end of an inner tube with a supply line for an abrasive powder material in mixture with air under pressure and also in common with the connecting end of an outer tube as fixed to the same connector member with a supply line for water under pressure through a transverse bore extending between the two connector members, the inner and outer tubes forming first and second orifices that preferably open towards a cup-shaped hollow space formed by a coaxially arranged circular collar. |