Abstract: The invention relates to an endodontic instrument which can be fitted on a vibratory handpiece (1) for the treatment of a tooth canal or the retreatment thereof, wherein it is made up of a rigid proximal portion constituting the sleeve which allows it to be fixed to the vibratory handpiece (1), of a median portion (4) which is also rigid and whose axis forms an angle (x) with the proximal portion, and of a distal portion (5) whose axis at the end forms an angle (y) with the median portion in the direction opposite that of the proximal portion, said distal portion being of a general conical line and of a dimension at the tip permitting its penetration into the canal.

Abstract: A head for a dental contra-angle having an operating shaft is coupled to the operating shaft in the vicinity of the bend of the contra-angle. The head is produced principally from a synthetic material and comprises an element for fastening the head onto the contra-angle, a pinion engaging a drive shaft associated with the head, and a support for receiving a tool and for locking the tool in the head. These various elements are designed so that the head can be sterilized or disposed of after use.

Abstract: Scaler consisting of a body comprising at its proximal end a device of known type for rapid connection to the lead of the dental unit, and leaving its distal end a scaling curette, and at its inside a vibration-generation device, characterized in that the scaling curette forms an integral part of the vibration-transmission device, and in that it cannot be detached therefrom.

Abstract: A canal instrument intended to be mounted on the head of a vibrating handpiece and allowing the application in the dental canal of filling paste by applying successive layers in order either to produce a complete filling or to produce a thin layer on the walls of the canal with a view toward lubrication or blocking-out of the spaces which can be left free by condensed gutta-percha points, including a handle (1) of known type for its fastening to the vibrating handpiece and a blade (2) provided over a part of its length, starting from its distal end, with one or more helicoid grooves whose edges (3) are rounded in order to prevent any cutting effect, and therefore reaming the root canal.

Abstract: Liquids for cleaning, disinfecting and lubricating dentistry handpieces are distributed to the handpieces by a device which includes reservoirs for storing liquids for the cleaning, disinfection and lubrication procedures which are to take place, and a series of solenoid valves for sequentially opening at different stations according to a prescribed cycle. To this end, each liquid to be utilized is conveyed through each handpiece in actual liquid form, and not in an atomized form, and then atomized in the handpiece by compressed air entering through a conduit which is separate from the conduit for passing the liquids.

Abstract: A device for stepping down and/or stepping up the speed of rotation of a motor element, such as a dental micromotor, includes two toothed pinions with common axes of rotation and which are mounted in a support piece. The support piece can turn through an angle (.alpha.) with respect to the body o the motor element about an axis (A) parallel with an axis (o) of the input pinion of the device and offset with respect to the axis (o) by a distance (OA). The axis (A) is further offset with respect to the axis (O') of rotation of the output pinion by a distance (AO') equal to the distance (OA). As a result, in a first position, the axis (O') is merged with the axis (O), and a first one of the pinions (or a crown wheel) is meshed with elements upstream of the kinematic chain. In a second position, following rotation of the support piece through a defined angle (.alpha.

Abstract: A support for a dentistry handpiece or contra-angle is connected to a dental unit, such as a motor, including apparatus for the supply of water and air for spraying the working point of the supported handpiece of contra-angle and, if desired, apparatus for supplying electric current to bulbs situated in the head of the handpiece or contra-angle for lighting in the working point and/or fibre optics. The rear face of the support is provided with a projecting ring of insulating material and the motor includes an annular hollow form for receiving the ring when the support is mounted to the motor.

Abstract: A dental handpiece which can receive one of a number of vibrating instruments for applications in endodontics or periodontal treatment includes an elongate handpiece for defining a body enclosing a non-rotating axle excited mechanically in vibration, mounted in the body by semi-flexible supports which contribute to generating and localizing a vibration node towards the front of the handpiece and to retain the vibrating axle centrally with its housing. A flexible interconnection is provided between the axle and the rotating driven shaft of the operating motor, to develop the vibrations which are desired.

Abstract: Canal instrument used in endodontics, characterized in that its flexible blade is made at least partially of titanium or of titanium alloy.

Abstract: The cutting shank of an instrument to be received in the head of a contra-angle of a dentistry handpiece is clamped in position with a pushed-button control device which is displacable counter to a tensioning spring. The control device generally takes the form of at least one reversal element for receiving pressures responsive to movements of the push-button and for converting such movements into a traction movement exerted by the reversal element on the pusher which is used to control the collet chuck which receives the shank of the instrument.

Abstract: Atomizing process and device for dentistry handpieces or angle pieces, characterized in that it involves generating, in the region of the receptacle of the tool in the handpiece or angle piece, a suction effect putting the vicinity of the cutter receptacle under a slight vacuum under the effect of an air cone of which the apex is situated at the point where the tool is working, the other function of this air cone being to direct the cooling fluid by means of an effect of the COANDA type, thereby reducing the consequences of turbulences attributable to the rotation of the tool or instrument.

Abstract: Automatic apparatus for cleaning dental handpieces and turbines is in the form of a housing having a compartment with hinged door. Standard motor noses project down from the top of the compartment to receive handpieces or turbines to be cleaned. Cleaning fluids, namely water, a disinfectant and oil are supplied sequentially to the motor noses while internal shafts of the motor noses are rotated by a set of pinions to drive the handpieces or turbines while the fluids are passed through them. The hinged door has an inflatable tube seal.

Abstract: A tool holder is furnished for fastening a dentistry-type tool to be subjected to vibrations. A core is attached to a generator of vibrations and includes a housing for a tool. A locking assembly cap having a rear end is fitted onto a forward area of the core. A locking assembly sliding component is placed over a rear area of the core for contacting the rear end of the core with front end of the locking assembly cap. A compressive spring engages the core and the locking assembly sliding component for pushing the locking assembly sliding component in a forward direction.

Abstract: The handpiece comprises a speed reducer (34) formed by an interchangeable modular unit. This reducer (34) is mounted in a housing (15) equipped with bearings (16, 17) supporting the input shaft (1), and the output shaft (10) respectively. The housing is closed on the input side by a side plate (18) formed from a piece which has a fixed wheel (7), is concentric with respect to the input shaft and is equipped with radial toothing (6) facing the inside of the housing (15). The output shaft (10) comprises, at its rear end, an output wheel (9) having a radial toothing (8) facing the interior of the housing. A ball thrust bearing is provided between an internal shoulder (15a) of the housing and an external shoulder (9a) of the output shaft.

Abstract: A dental drill having an elongate drill body tapered to a conical tip. The drill body has a plurality of substantially identical barbs projecting outwardly from the drill body and arranged helically about the drill body. Each barb has an outer peripheral profile resembling a parabola in shape extending generally toward the tip of the drill body. Each barb has a flat surface contiguous with the flat surface of an adjacent barb at a point of juncture with the drill body. The barb flat surfaces are disposed in a common helical path about the drill body and each has a shape resembling a parabola. The barbs have a peripheral profile also resembling a parabola. Each resembles a paraboloid in which intersections by planes parallel to the corresponding flat surface thereof and spaced axially on the drill body resemble parabolas with the axes thereof decreasing in length as the intersections are made in a direction toward the tip of the drill body.

Abstract: A syringe is provided with a helical spring, which furnishes an upper limit to a pressure employed via a plunger to move a fluid or paste through an opening in a syringe. The plunger is maintained in a low compressing state versus the fluid with the helical spring. A toothed rack is attached to the plunger. The toothed rack is engaged by a ratchet forming part of a lever. The lever is hinged on an axially movable assembly. Actuation of the lever drives the ratchet and therewith toothed rack and plunger forward against the force of the spring. As more force is applied to the plunger the resilient force of the compression spring allows the axially movable assembly to move backward and thus to limit the pressure exerted by the plunger on the fluid. A second ratchet can be provided for preventing a backward motion of the toothed rack while the lever seeks a new point of engagement for the ratchet with the toothed rack.

Abstract: This packing case comprises a support provided with a plurality of separate parallel cavities adapted to receive the dental canal instruments and a protection cover consisting of a self-adhesive sheet. This sheet of thin transparent and flexible material has a gripping edge parallel to the longitudinal axis of the cavities and this edge projects laterally from the support surface. By raising the sheet by means of the gripping edge the user can uncover the cavities one by one and thus pick up a selected instrument by simply turning the case upside down, the other instrument being retained in the case. With this packing case it is possible to pack various types of dental instruments such as files, reamers, drills, Hedstroem files, nerve broaches, etc., and the cover may also be used as a label carrying inscriptions concerning the type of dental instrument contained in the case.

Abstract: This equipment for dental surgeons comprises a hand-piece incorporating at least one bulb for illuminating the treatment area and an endpiece housing a battery. This endpiece comprises on its front end a pair of springloaded contact studs adapted to engage with corresponding concentric tracks formed on the rear face of the handpiece for energizing the bulb. The battery is rechargeable by means of a device comprising two concentric tracks of same diameter as the handpiece tracks and connected to a circuit adapted to switch automatically between a quick-charging condition and a slow-charging condition according to the voltage developed across the battery terminals.

Abstract: This device comprises a dental handpiece (15), notably a contra-angle, detachably coupled to a socket (35) so that the handpiece can rotate freely relative to the socket, this socket incorporating a micromotor for driving the dental treatment tool. The handpiece comprises means for illuminating the treatment area and the electric power supply between the two elements is taking place by means of spring loaded contact pistons (19, 22) parallel to the handpiece axis and projecting from the front face of one of the two elements, the contact pistons being adapted, in the coupled condition, to be urged against corresponding annular electric tracks (18, 21) provided at the end of the other element, these tracks being insulated from each other by a ring (20).