Provided is a torque wrench for an implant procedure including: a first body having a predetermined length, and including a head portion having an end to which a torque wrench driver bit is coupled; at least one second body having a predetermined length, provided at one side of the first body, and including a coupling portion formed in a longitudinal direction thereof; and a second shaft rotatably coupled to the coupling portion of the second body, including a second gear provided at one end thereof and a knob provided at the other end thereof, and configured such that, in response to rotation of the knob, the second shaft transmits torque to the torque wrench driver bit through the first gear engaged with the second gear.

The present disclosure provides a dental screw (10) for fixing dental components (1, 2) to each other, the dental screw having a proximal end (11), a distal end (12), and a longitudinal axis (LS), wherein the dental screw further comprises a screw head (13) including a tool engaging interface (20) for engaging a fastening tool (30) at the proximal end and distally to the screw head a screw shank (14), the screw shank comprising a torque limiting portion (15) and distally to the torque limiting portion a threaded portion (16) for engaging a dental component (1, 2, 3), wherein the dental screw is configured to transfer a minimum torque from the tool engaging interface to the threaded portion of 26 Ncm and the torque limiting portion is configured to limit the torque transferable to a maximum torque for preventing damage to the threaded portion. The disclosure also provides a dental fastening tool, a dental fastening set, and a dental support set.

In some embodiments, the current invention relates to a method and/or system for using a standard dental handpiece for endodontic cleaning. For example, a dental adapter is disclosed having a fitting for a standard dental handpiece, a torque limiter and/or a mount for an endodontic file. For example, the adapter may be single use and/or multi use. In some embodiments, the mount includes the torque limiter. For example, an endodontic file may be connected to the mount with a friction fitting that allows rotation of the file with respect to the mount at high torque. Optionally the mount is positioned eccentrically with respect to the fitting.

A medical or dental device for determining a bone's quality by cutting a thread into the bone with a rotating threaded element comprises a control unit having a measurement circuit configured: (i) to determine values of the motor current via a first electrical contact device with which the motor drive is supplied for rotational drive of the threaded element that can be connected to the motor drive, the current values being a measure of the bone's quality; (ii) to monitor and/or to determine the penetration depth of the threaded element into the bone, and (iii) to generate measurement signals which show the relationship between the penetration depth and the determined current values or parameters derived therefrom, and to transmit these signals to a display unit, which displays the relationship between the determined current values or parameters derived therefrom, in particular the bone's quality, and the penetration depth.

A dental handpiece control apparatus including: a relay 17 that switches a polarity of a voltage applied to a motor 20, and thereby switches a rotation direction of the motor 20 to forward rotation and backward rotation, the motor 20 being incorporated in the dental handpiece to rotate a cutting tool (a file) mounted to the dental handpiece; and a control section 11 that controls the switching of the voltage polarity by the relay 17 based on a rotation angle θ.sub.F for forward rotation and a rotation angle θ.sub.R for backward rotation of the motor 20, the rotation angle θ.sub.F and the rotation angle θ.sub.R being associated with state information of the file.

A system and method for compensating for torque reaction forces in a medical, apparatus is disclosed. The astern may include a rotary element which rotates about an axis. A contra-rotating flywheel may be driven to rotate about the axis relative to the rotary element, wherein the flywheel is free to rotate and is accelerated and decelerated by a driver which is fixed to the rotary element. Contra-rotation of the flywheel may compensate for torque reaction forces when the rotary element is accelerated or decelerated.

The invention relates to a dental preparation instrument that includes a tool that rotates in an alternately reversible manner. The preparation instrument has a drive for the tool. The drive provides a continuous fully rotational motion, and a gearing is arranged before the tool. Said gearing converts the continuous fully rotational motion of the drive into an alternately reversing rotational motion, which is continuous as viewed over several reversals.

A torque wrench as a ratchet instrument for medical technology, including receiving opening which has head region, neck region adjoining head region, rod-shaped actuating lever fastened to neck region for application of torque to the head region, and enclosure forming receiving opening of head region. Furthermore, torque wrench includes spring clip and latching lug formed thereon. The latching lug in rest position of latching lug protrudes into receiving opening and in entraining portion of latching lug is intended to interact with counterpart surface of insertion instrument inserted into enclosure during rotation in tightening direction of actuating lever in entraining position. The latching lug is intended to move into release position during rotation contrary to tightening direction against force of spring clip, in order to provide free running between head region and insertion instrument. The enclosure has break extending over entire cross-section of enclosure and forms spring clip.

A reciprocating endodontic hand tool in which the torque applied to an instrument such as a debriding file can be set at or below an endurance limit of the file below which failure of the instrument will not occur. In preferred embodiments the tool can switch between settings in which the torque applied to the instrument is between the endurance limit of the file and an elastic limit of the file, by setting forward and reverse angles of rotation within specified limits. This reduces or eliminates opportunities for plastic distortion, fatigue and breakage of the file during the canal debriding/cleaning/shaping process in a root canal treatment or retreatment. In some embodiments the torque may be set to at or below a durability limit of the file below which failure of the instrument will not occur through repetitive strain over the course of a particular root canal treatment or retreatment.

A drill limit system includes a holder having drill stops removably coupled thereto and configured to receive a drill bit therethrough, and a platform coupled to the holder and configured to engage a tip end of the drill bits when received through the drill stops, wherein the holder and platform are movable relative to each other so that the position of the drill stops relative to the drill bits may be selectively varied. A method for attaching drill stops to a drill bit includes providing a holder and a platform movable relative to each other, the holder having a plurality of drill stops removably coupled thereto, inserting a plurality of drill bits through respective drill stops, moving the holder and platform relative to each other to select a desired height of the drill stops on the bits, and engaging the drill stops to the drill bits at the selected height.