An electric dental handpiece including a head engaging a handle and configured to rotatably support a tool. The handle includes a lower handle portion and an upper handle portion with the lower handle portion engaging the head and the upper handle portion having an attachment area configured for attachment to a power supply. An electric motor is positioned with a majority thereof within the lower handle portion and is configured to rotate the tool.

A dental preparation instrument having a pneumatic turbine (1) with a rotor (5) for driving a tool (1.1), wherein the rotor (5), which is mounted in a turbine chamber (18) for rotation about an axis of rotation (4), is impinged by compressed air from a compressed-air nozzle (22). A first radial partition (23) has an opening (17) via which an annular space (8) is in flow connection with an outlet duct (19).

The present invention relates to dental medical instruments, and specifically discloses an automatic grinding drill device for oral caries, including a mounting frame. Two retainers are arranged on the mounting frame, the bottom of the mounting frame is connected with a support plate through drive assemblies, a drill bit assembly is arranged at the bottom of the support plate, and a visual recognition module is also arranged on the support plate. The present invention has the advantage that the retainers keep a real-time relative static state with teeth of a patient during use, needing no frequent correction, so that operation steps are simplified.

A dental handpiece includes a barrel, an air turbine, a central shaft, a bearing and a seal. The barrel includes an axial open end. The air turbine is rotatably provided in the barrel. The central shaft is secured to the air turbine to rotate with the air turbine. The bearing is mounted in the barrel and supports the central shaft for rotation. The seal is trumpet-shaped and arranged between the open end of the barrel and the bearing. The seal includes a sealing portion sleeved over an outer cylindrical surface of the central shaft. The sealing portion is deformable to separate from the outer cylindrical surface of the central shaft or closely contact the outer cylindrical surface of the central shaft depending on a pressure difference between interior and exterior of the barrel.

Fluid-operated dynamoelectric converters for medical or dental devices are described. The dynamoelectric converters have: a fluid line which is designed in one piece with an outer sleeve of the dynamoelectric converter and protrudes at its end which faces away from the dynamoelectric converter beyond a connecting end of the medical or dental device; a fluid-operated impeller which is designed in one piece with a rotor sleeve receiving the magnetic element; a one-piece, sleeve-shaped magnetic return element which surrounds the rotor and the electric winding of the stator and has a magnetically conductive material.

A dental handpiece includes a barrel, an air turbine, a central shaft, a bearing and a seal. The barrel includes an axial open end. The air turbine is rotatably provided in the barrel. The central shaft is secured to the air turbine to rotate with the air turbine. The bearing is mounted in the barrel and supports the central shaft for rotation. The seal is trumpet-shaped and arranged between the open end of the barrel and the bearing. The seal includes a sealing portion sleeved over an outer cylindrical surface of the central shaft. The sealing portion is deformable to separate from the outer cylindrical surface of the central shaft or closely contact the outer cylindrical surface of the central shaft depending on a pressure difference between interior and exterior of the barrel.

The invention relates to a device for the controlled supply of compressed air to at least one pneumatically operated dental instrument (5, 5, 5, 5) from a supply and control unit (2), in which a dental instrument (5, 5, 5, 5) is connected by a supply hose (4, 4, 4, 4) for supplying compressed air with a valve mechanism (6) provided in the supply and control unit (2), the valve mechanism (6) having a plurality of pneumatic sliding valve units (9, 9, 9, 9). The pneumatic sliding valve units (9, 9, 9, 9) of the valve mechanism (6) are accommodated in at least one valve body (10) and the valve body (10) has a plurality of control connections (12, 12, 12, 12), whereby each pneumatic sliding valve unit (9, 9, 9, 9) corresponds to a control input (12, 12, 12, 12) and pressurization of a control input (12, 12, 12, 12) with switching compressed air opens the corresponding sliding valve unit (9) and locks the additional, closed sliding valve units (9, 9, 9).

Provided are an air turbine that may increase a rotational cutting force of a cutting tool, a dental handpiece and the like that uses the air turbine. An air turbine 2 includes a rotary blade 20 (rotor), an upper shaft member 21 coaxially disposed on an upper side of the rotary blade 20, a lower shaft member 22 coaxially disposed on a lower side of the rotary blade 20, and a cutting tool 24 that has a tapered, substantially cylindrical shape and that extends coaxially downward from the lower shaft member 22. The rotary blade 20 is formed of ceramics or metal having a specific gravity of 3.0 or more, or a combination thereof (including a composite material).

An object is to provide a medical instrument element, a medical instrument, a medical instrument component, and a medical handpiece processed in a complicated manner so as to provide a desired level of performance, and a method for producing the medical instrument element. A head housing (31) including a cooling path (50) permitting cooling water to flow therein and including a bent portion at which a flow direction of the cooling water is changed is formed by stack molding.

A disposable dental instrument of the compressed air drive type is disclosed for use in performing dental procedures on a workpiece. The disposable dental instrument is constructed from two mating shells and a core. Each shell incorporates a mating surface and the shells are joined using various bonding methods to ensure a waterproof, high quality dental instrument. An elongated body has conduits penetrating a base at one end of the body. The conduits allow entry of a light beam, a pressurized water stream, and a compressed air stream into the body. The base includes attachment threads for securing the body to a source of the light beam, pressurized water stream, and compressed air stream. Pluralities of passageways are in communication with the conduits for conducting the light beam, the water stream, and the air stream through the body. A head at the opposite end of the body rotatably mounts a turbine shaft on bearing surfaces which inhibit vibration and noise. The turbine shaft includes a turbine impeller and a clamping hole for removable attachment of a dental bur to the shaft. The air stream drives the impeller at a high speed for rotating the bur about a rotational axis. An opening in the body adjacent to the head allows release of the light beam, the pressurized water stream, and a portion of the compressed air stream in a direction toward the distal end of the bur so that the bur, the light beam, the water stream, and the air stream may all converge on the workpiece.