Abstract: A precision injection system and method for intralignmental anesthesia and the like having a syringe with a tubular handle portion to which are removably connectable individually tubular headpieces as a longitudinal extension thereof. The headpieces receive a carpule cartridge with semi-solid contents therein or with liquid injection contents monitored during injections through elongate windows on opposite sides of the headpieces. Provision is also made for injection of known composite materials the viscosity of which cannot be determined by standard viscosity measurement methods. A dosing plunger housed in the tubular handle portion in a retracted start position is activated by a servo-dosing lever and advances incrementally axially into a mounted headpiece for delivery of metered quantities of the contents of the carpule cartridge each time the servo-dosing lever is actuated.

Abstract: A transmission device for use in a dental handpiece has a modular unit comprising an input shaft coaxial to and driven by the motor shaft, and an oblique shaft extending obliquely with respect to the input shaft and also to the tool driving shaft. Each end of the oblique shaft carries a bevel pinion, one bevel pinion meshing with a bevel wheel fixed to the input shaft and the other bevel pinion meshes with another bevel wheel fixed to the tool driving shaft. The input and oblique shafts are mounted in suitable bores formed in a socket, the oblique bore remaining without the peripheral limits of the socket. The socket is adapted to be forcibly fitted into the handle of the handpiece.

Abstract: A chuck for receiving a plain shank of a dental burr is rotatably mounted in the head of a dental handpiece and is driven by a pinion or by turbine vanes. The chuck comprises a sleeve adapted to receive the shank of a burr and provided with at least one elongate clamping claw which is movable radially between an inner clamping position and an outer releasing position. Facing grooves in the clamping claw and in an actuating member which is movable axially relative to the sleeve define a ramp way for a row of bearing balls. The ramp way extends in a direction which is generally axial but is inclined at an angle of 1.degree. to 4.degree. to the axis so that the clamping claw is moved radially by axial movement of the actuating member. The clamping claw is spring biased to clamping position and is movable to releasing position by a push button for moving the actuating member axially relative to the sleeve and thereby moving the clamping claw radially outwardly.

Abstract: A dental contra-angle handpiece composed of a front body having a tight fit onto a rear body. The fixing device between the two pieces consists of a key in the form of a segment of a circle which passes through slits cut in the front body, in the rear body and the inner sheath which supports the driving shaft. A ring in the form of a cap which is fitted onto the front body and onto the rear body locks the key. The invention is applicable to all kinds of dental handpieces.

Abstract: A dental handpiece comprises a front part with a head and a handle part. The head is provided with at least one miniature bulb mounted therein for illuminating the treatment area and the dental handpiece is provided with means for supplying electric power to the bulb. At the junction between the front part and the handle part of the handpiece is disposed an axially extending spring blade contact mounted in the handle part. When these parts are operatively connected, the spring blade contact is spaced from a fixed contact carried by the front part. A switch comprised of a push-knob is mounted on the handle part adjacent to the spring blade contact and operative to actuate the spring blade contact for closing the light circuit. The spring blade contact acts as a return spring to the push-knob so as to normally urge it to its open-circuit position. Thus, the dental surgeon can light the bulb only when required.

Abstract: The contra-angle is provided with means for illuminating the site of treatment. The light source is incorporated inside the body of the contra-angle, and in front of this light source is inserted an optical element arranged to deflect the light rays towards the site of treatment. This optical element comprises a total reflection prism embedded in a recess in the body of the contra-angle.

Abstract: This contra-angle head of a dental handpiece comprises means for axially locking the dental instrument, in the form of a hollow guide member enclosing the upper portion of the driving pinion inside the head casing, this guide member being mounted for axial movement in the casing and rotating with the pinion by means of at least two wedge members disposed in the guide member and adapted to engage an annular groove of the dental instrument and to bear against the upper edge of this groove. A spring constantly urges the guide member away from the casing so that the instrument is pushed inwardly in the pinion by the wedge members for engagement with a shoulder formed in the pinion bore and acting as a stop means, the wedge members thus exerting a constant play take-up function.

Abstract: System of coupling of the head of a drive unit to the body of a driven unit, characterized in that, the head bears a longitudinal key having two slopes inclined in relation to the axis of the head, and the body has a guiding or key-way groove for this key, this groove opening on an annular clearing in which a segment can be rotated against a spring and in which a pin is fastened radially, so that, while the key is engaged, this pin, by cooperation with the first of the slopes controls the rotation of the segment, then by cooperation with the second slope controls the blocking of the head in its driving position, and the segment can also be operated by hand so as to free the pin and allow the withdrawal of the head by drawing the key rearwardly.

Abstract: The invention relates to a dental drill.According to the invention, the drill has a triple helicoidal flute and progressive pitch, the free spaces between the cutting lips increasing from the tip (3) toward the shank (1) of the drill.Application: dental apparatus.

Abstract: A system for maintaining in the head of a vibratable dental tool holder a dental tool releasably held axially in fixed position in a transverse passage oblique to the longitudinal axis of the dental tool holder. The system comprises a first sleeve axially of the dental tool holder having a leading edge bearing against the dental tool. A second sleeve is threaded on the dental tool holder and it keeps the first sleeve in close contact with the dental tool keeping it from moving axially away from the dental tool in response to vibration of the dental tool holder during operation.

Abstract: A precision injection system for intralignmental anesthesia and the like having a syringe with a tubular handle portion which is removably connected a tubular headpiece as a longitudinal extension thereof. The headpiece receives a carpule cartridge with injection contents monitored during injections through elongate windows on opposite sides of the headpiece. A dosing plunger housed in the handle portion in a retracted start position is activated by a servo-dosing lever and advances incrementally axially into the headpiece for delivery of metered quantities of the contents of the carpule cartridge each time the servo-dosing lever is actuated. Provision is made for semiautomatic resetting of the dosing plunger to a retracted start position by depressing a resetting key and raising the syringe to a generally vertically raised position.

Abstract: A dental tool having a head with an output spindle to which are coupled dental treating devices such as a dental massaging brush. The output spindle is driven with a reciprocatory rotary motion imparted to it from a rotationally driven drive shaft coupled to the output spindle by a drive coupling device which converts the rotational motion of the drive shaft to reciprocatory rotary output of the output spindle. An O-ring effects a seal about the output spindle where it extends outwardly of the head. The drive coupling device has an eccentric stud fixed eccentrically to the drive shaft extending therefrom from one side to the other of a projection of the longitudinal axis of the drive shaft and making an angle with the projection of the axis. The eccentric stud is received in an axial slit in the output spindle for effecting the motion conversion.

Abstract: A device for supplying luminous energy to a dental instrument to illuminate the area of treatment on a tooth being treated. The luminous energy is applied from a bulb housed in the device through an optical fiber extending through the dental instrument and having an end disposed for receiving the luminous energy from the bulb. Provision is made for energizing the bulb when the device is mounted on an electrical supply cable. A contact arrangement of two conductive studs disposed in a bore of an insulating sleeve and axially biased by a conductive spring to extend from the bore provides for making contact between the bulb and supply cable when the device is mounted on the supply cable. A section of the bore of the sleeve between the ends of the sleeve defines shoulders limiting the axial travel of the studs which have enlarged ends for engaging the shoulders.

Abstract: A hand-held implement for removing dental scale provided with a rigid shaft to which is applied vibrations in a rotational or circumferential direction by a dynamically unbalanced air driven turbine. The rotor of the turbine is coupled to the shaft by a bearing and the shaft is restrained from rotating and restrained axially. Provision is made for supplying cooling water through the shaft to a dental scale removing tool mounted on a free end of the vibrated shaft.

Abstract: This dental canal rotary instrument comprises a handle having a hollow metal sleeve surrounding concentrically the inoperative end of the instrument shank; a suitable plastic material is cast into a mold so as to fill the gap left between the sleeve and the shank to form a plastic core embedding the shank, the latter protruding from at least one of the sleeve ends; a notch is formed in the sleeve for anchoring the sleeve and the plastic core, and a flat face is provided on the embedded shank end, in order to improve the adherence of the sleeve, core and shank to one another.

Abstract: Device for high-speed coupling between a dentistry appliance and an element to which it is connected during use by the practitioner, characterised in that it comprises essentially:(a) a collar (6) truncated over at least one segment (7) and fixed to the dentistry appliance;(b) a ring (12) fixed to said element, the end (14) of which is recessed to form a female shape into which the profile of said collar can fit, the connection being obtained as a result of the positioning of the collar (6), after it has penetrated into said recess (14), in a groove (15) in the ring as a result of relative rotation of the collar and the ring.Application to the connection of dentistry articles.