Abstract: The instrument to be ground is positioned lying on the brackets of a support, with its longitudinal axis horizontal and parallel to the plane of a base plate of the apparatus. A grinding stone, mounted on a carrier arranged in such manner as to be able to slide on the base plate is moved opposite the end of the blade of the instrument while rubbing lightly against the cutting face of this blade, thus acting to grind that face. The inclination of the grinding stone is adjustable according to the configuration of the instrument, a dial clinometer enabling this inclination to be checked and to determine it as a function of indications which will be furnished, to this end, by the manufacturer of the instrument.

Abstract: A syringe, such as used in dentistry to inject dental products, e.g. injection masses as so-called composites, cements, medicated pastes and the like into cavities. The syringe comprises a hollow cylinder, a piston axially movable in the cylinder, and a reservoir for the product to be injected. The piston fits into the reservoir which has at its front end a nozzle projecting out of the cylinder and at its back end an opening to receive the piston. At its front end the cylinder has a reduced inside diameter, so as to provide an abutment for the reservoir. The piston is removable from the cylinder so as to permit insertion of the piston into the back end of the reservoir, whereupon the piston with the reservoir attached to it can be inserted into the back end of the cylinder. Pressure on the piston forces the piston into the reservoir, so as to press the injection mass out of the nozzle of the reservoir.