Abstract: The angle piece head drives an instrument for operating on dental roots and includes a body having a generally cylindrical cavity and an instrument-holding core in the cavity. The core is shaped to receive and hold the instrument and moves axially and pivotally. The instrument-holding core includes a groove having an offset engaging therewith. The offset engages with one or the other of the two edges of the groove such that the rotation thereof transmits an alternating axial movement to the instrument while enabling same to rotate about the axis of the instrument. The groove includes two portions that extend on either side of a median area. For each portion, the height, namely the distance that separates the two edges, increases from the median area to each end of the groove.

Abstract: A dental reamer root canal instrument has a working area that is substantially cylindrical or conical along a longitudinal axis, the instrument including X helical flutes forming X lips of helical cuts, a cut lip being formed by the intersection of two consecutive flutes, wherein X is equal to or greater than three. Over a cross-section of the instrument, the angles (?I, ?I, ?I) between two consecutive cut lips, measured relative to the longitudinal axis of the instrument, are all different. A method for producing the root canal instrument in a cylindrical or conical rod is also disclosed. The rod is made of a metal or metal alloy material selected for the mechanical bending strength and shape memory properties thereof. The method includes steps for using a grinding wheel to machine a flute to a predefined depth and steps for rotating the rod in front of the machining wheel.

Abstract: A novel apparatus is provided for moving tools used in surgery, in particular in dental surgery. The apparatus includes a head into which a tool is attached and a shaft onto which the head is attached, characterized in that said apparatus also includes a means for transmitting the movement of a motor to the tool, the transmission means including a first transmission axis, for transmitting a first movement at a first frequency, and a second transmission axis, for transmitting a second movement at a second frequency, the first frequency being different from the second frequency.

Abstract: A rotary rammer is provided which is suitable for the cold filling of a root canal. The rotary rammer includes an active zone having a shoulder and a point. The active zone has a generally conical form, an outer surface of which is smooth, a diameter of a section of the active zone in the vicinity of the point being less than a diameter of a section of the active zone in the vicinity of the shoulder. An end section is provided adjacent to the shoulder of the active zone. The end section has a means for connecting to a mandrel of a mechanical rotational driving device. The rotary rammer is applicable to the dental field.

Abstract: A handpiece includes a head for receiving a tool, a rear sleeve for coupling the handpiece to a motor, and a body connecting the head to the rear sleeve. The body includes a hollow sleeve in which mechanical members are mounted in order to transmit a rotating movement to the tool. The body also includes an over-molded casing made from a composite material, in which the hollow sleeve is encased. The handpiece is suitable for use in the dental and medical fields.

Abstract: A new reamer has a cut blade including a plurality of helical cutting lips, wherein a number of helical cutting lips varies along a longitudinal axis of the cut blade.

Abstract: A dental handpiece (1) includes mechanical components, in particular, a tool-holder assembly for the attachment and for the rotational driving of a dental instrument about a drive axis (6) and an assembly for the transmission of such movement. The mechanical components are mounted in the interior of a body (2) having a head (4) and a handle (3). The mechanical components of the handle and the head of the handpiece are electrically connected by an elastic and electrically conducting connecting device.

Abstract: A head assembly for attaching to a dental instrument has a body, a rotary shaft with a pinion thereon, at least one retractable catch latching lever and a retractable catch. The rotary shaft has a central bore suitable for receiving a shank of the dental instrument therein. The latching lever has a peg engageable with an annular latching groove of the shank of the dental instrument. The catch has a positioning plane coinciding with the drive flat of the instrument. The body has a circular opening closed off by a push button cooperative with the rotary shaft so as to release the shank of the dental instrument.

Abstract: The invention relates to a device for axial retention of a dental instrument shank and for transmitting the rotational driving of the instrument. The device is arranged in a head of a contra-angle or handpiece. The shank has an annular groove in which at least one stud is able to engage radially, and a flat permitting rotational driving of the shank. The rotational movement is communicated by an output pinion of a mechanical transmission assembly coupled to a drive motor and arranged in a sleeve joined to the head of the contra-angle. The device is formed by a shaft traversed axially by the instrument shank, at least one elastic lever, and at least one pin. There is cooperation of the pin or pins with the flat provided on the instrument shank.

Abstract: The invention relates to a protective device for dental equipment of the type including a straight handpiece or a contra-angle. The dental equipment is formed by a body enclosing a motor unit and/or members for transmitting movement and a tool-holder head bearing a tool. The protective device is a sleeve that has the general form of a glove finger, with an opening at one end and a closed base at the other end. The invention also relates to a sealed packaging for an insert formed by a tool-holder head bearing the tool and equipped with the protective device.

Abstract: A blank for use in producing an endodontic instrument using a grinding technique includes a cylindrical portion, and a generally conical portion which is to be machined by the grinding technique to form the active part of the endodontic instrument. The generally conical portion of the blank approximates, and is slightly larger than the envelope of the final shape given to the active part of the endodontic instrument after machining. A method is also provided for producing an endodontic instrument having at least one helical cutting edge using the blank.

Abstract: A dental power instrument, in particular, an endodontic instrument, has an operative part (2) at one end and a handle (3) at the opposite end. The handle (3) of the dental instrument is provided with a rotary drive (4) which, when mounted in the head (5) of a handpiece, can directly engage with a rotary drive (4?) upstream of the head. The rotary drive (4) can be inserted and withdrawn independently of the rotary drive (4?) associated with the head of the handpiece, and rotates in the same direction as the rotary drive (4?) associated with the handpiece. Also provided is a handpiece head (5) and a dispenser (30) for such dental power instruments.

Abstract: A sequence of canal instruments for performing an endodontic operating protocol uses a sequence of several instruments, for example, three such instruments with three cutting blades. The instruments have a progressive conicity, for example, 6%, 4% and 2%, and each instrument has an identical progressive pitch. The pitch further increases progressively from instrument to instrument as a function of the conicity of each instrument.

Abstract: The invention relates to a method for designing and producing a package intended for the protection and/or transportation of a product. All of the digital design steps for the package are integrated in the method for digitizing the product, which includes a step of laminating a virtual key form of the product used to define geometrical data of each layer of the package to be cut. Then, the cutting is carried out followed by the stacking of the layers of the package defined by the design steps for said package to form a real package. The invention also relates to the package obtained by the method.

Abstract: The invention concerns a device for locking a dental instrument having a rotating spindle, formed by a hollow spindle and adapted to receive the head of an instrument, and a locking spring formed by a lower ring extending on a common side by two branches or a plurality of elastic branches. Each branch is provided with a pin engaged in an annular groove provided in the head of the instrument. There is a push-button having, in its underside, a central conical pressure head adapted to space apart radially the branches of the locking spring to release the pins from the annular groove of the instrument. The locking branches are housed in the slots provided in the rotary spindle to lock in rotation the spring relative to the rotary spindle, the spring being moreover maintained axially between the push-button and a shoulder of the rotary spindle.

Abstract: Apparatus is disclosed for use in cleaning dental root canals using an endodontic file. The file is mounted in a drill head driven by an electric motor. The motor is normally driven in one, forward direction, but periodically, the motor rotation is reversed for a very short time. The duration of the motor reversal is so short that although the motor rotates in the reverse direction, the inertia and backlash in the transmission between the motor output shaft and the drill head is such that the direction of rotation of the file in the root canal is not changed.

Abstract: The invention relates to a contra-angle for implantology or surgery with a head for holding and rotating an instrument about its longitudinal axis, and a handpiece containing, in a non-limiting manner, a connection providing the connection with an external motor drive, and a reducing assembly with an output gear. The contra-angle is formed of removable subassemblies, and principally of a subassembly called the intermediate support, including an input gear meshing with the output gear of the reducing assembly and an end gear mounted on the same rotating shaft and inside a hollow cylindrical body. The intermediate support is mounted so as to slide freely along an axis inside a central part of a head body and enabling positioning in the head and rotational driving of a removable head cartridge, when all the subassemblies are mounted together to form the contra-angle.

Abstract: An instrument for reaming a root canal, in particular, in the apical zone, includes proximal portions for receiving a handle which allows the instrument to be used by hand or on the head of a dentist's contra-angle handpiece, and distal portions having a blade with a pointed tip of a known type. The active, cutting part of the blade has, from the pointed tip and continuing along the blade, two conical sections. In addition to the pointed tip, each of the conical sections has a greater conicity than the least distal part adjacent to it. The instrument is useful for reaming root canals using a sequence of instruments which avoid root weakening and the flow of filling material from the end of the canal.

Abstract: A catheterization device for preparing and filling a tooth endodontic cavity includes at least one root canal tool connected to a drive head. The tool is movable and has a base movably driven by the drive head about the reference axis of the base. A totally or partially eroded, filiform and elastic working part freely extends from the base and has an axis shifted in a parallel position with respect to the reference axis of the base.