Various aspects are directed to dental extraction and dental extraction devices. As may be implemented in accordance with one or more embodiments herein, a dental extraction apparatus includes an engagement component that extracts teeth from patients' mouths by engaging with and applying a torque to a tooth. An input torque component translates received input torque to the engagement component. A torque controller operates with the input torque component and the engagement component to limit the applied torque, relative to input torque provided via the input torque component.

The invention provides a unitary cordless dental drive apparatus with a cantilever arm extending outward and positioned to allow a dental nose cone to be connected. An activating switch is located at the free end of the cantilever arm in a position that is convenient for manipulation by a user. In a second embodiment, the switch is in the form of a contactor mounted below the cantilever arm to contact the nose cone when pressed. In a third embodiment, a foot pedal connected to a wireless transmitter is provided to send a signal to a receiver located within the handpiece for activating the handpiece.

A system for driving an electric handpiece in response to a pneumatic control signal may provide for fast interchange of handpieces, self-calibration and wide dynamic range of operation with precise speed control. The system may be incorporated into virtually any dental treatment center using traditional pneumatic drive handpieces, and a conversion kit may facilitate such conversion. The system may provide not only for controlling the speed and torque of a tool coupled to an electric drive handpiece responsive to a pneumatic control signal, it may also provide for coupling cooling air and treatment media, such as air and/or water to the handpiece. Coupling of a handpiece to an operating base of the system, including coupling of media lines and electrical connections may be made with a simple press and twist action using quick connection structure.

A root canal treatment apparatus includes a root canal treatment hand piece having a visible light camera which captures a visible light image of a tooth as a target of interest, and circuitry which detects a position of the root canal treating hand piece, and instructs display of three images corresponding to at least a tip position of a cutting tool attached to the root canal treating hand piece, an X-ray cross-sectional image of the tooth captured by X-ray CT image capturing beforehand, and the visible light image captured by the visible light camera such that the three images are displayed on a display in an overlapping manner in positional correspondence with one another, based on information on the position of the root canal treating hand piece detected by the circuitry.

A manually-wound or charged, powered toothbrush includes a winding mechanism, an energy storage element, and an output gear train to cause a rotating, oscillating or sweeping brush head to move, thus improving the efficacy of the user's oral-care regimen.

Various implementations include a surgical screwdriver that comprises a first rotating shaft configured to be rotated about a respective longitudinal axis, a second rotating shaft extending along a respective development axis transverse to the longitudinal axis of the first shaft and having a shaped end tip that can be inserted into the head of a screw, and a transmission member interposed between respective first ends of the shafts to transfer the rotation from the first shaft to the second shaft. The transmission member comprises a pair of hemispherical elements, hinged together about a respective junction axis that is perpendicular to the longitudinal axis of the first shaft, and each hemispherical element is in turn hinged to a first end of one of said shafts.

The invention provides a unitary cordless dental drive apparatus with a cantilever arm extending outward and positioned to allow a dental nose cone to be connected. An activating switch is located at the free end of the cantilever arm in a position that is convenient for manipulation by a user. In a second embodiment, the switch is in the form of a contactor mounted below the cantilever arm to contact the nose cone when pressed. In a third embodiment, a foot pedal connected to a wireless transmitter is provided to send a signal to a receiver located within the handpiece for activating the handpiece.

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.

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.

Described herein is a dental handpiece for the endodontic treatment of a root canal, including a chuck for attaching and holding an endodontic file, an electric motor having a shaft for driving the endodontic file, and a control unit for controlling the motor, which receives a stream of input data. While monitoring the stream of input data, the control unit determines the current absorbed by the electric motor, and controls the motor so that the file alternates the direction of rotation at a frequency of from 1 to 20 Hz between a first direction and a second direction opposite to the first direction, and whereby the control unit controls the electric motor so that the file continuously rotates in the second direction when the monitored data fulfils a predetermined torque threshold condition during rotation in the first direction.