A dental handpiece of the present invention is provided with a head extending at substantially a right angle to said handpiece having a hollow therein. The head is also provided with a hollow vertically communicating with the hollow of the handpiece. A semispherical groove is cut into the hollow wall longitudinally and partially adjacent an orifice of the head. A cartridge having an elongated opening cut through at a mid-portion of a bottom thereof and also a small opening at a top wall near a lower orifice and at the same position as the semispherical groove is mounted into its hollow with a rotatable bushing through metal bearings inserted into a lower and upper orifices of the hollow. A gear is secured to the bushing at a position to form an entry into the elongated opening of the cartridge. Together with the spherical groove of the head and the small opening of the cartridge, a semispherical cavity cut into the lower metal bearing defines a spherical space for a metal ball. Accordingly, when the cartridge having a reamer is inserted into the head, the metal ball is fitted in a protruding fashion into the semispherical groove to prevent idling between the gear and metal bearings. The gear secured to the bushing can be easily adapted to mesh with a gear of the driving gear rotatably mounted within the handpiece, thus enabling the dentist to easily exchange the cartridge comprising the worn out parts.
A dental handpiece consisting of a driving sleeve which includes a driving arrangement, a base sleeve and a head sleeve including a dental work tool. At least the base sleeve and the head sleeve are detachably interconnected for the purpose of exchanging the head sleeve, and in which a shaft is supported within the base sleeve which is in rotational connection with the driving arrangement in the driving sleeve, and which is provided with a rotation-transmitting element for engagement with a shaft component supported within the head sleeve.
A dental apparatus for perforating the cortical plate of human maxillary and mandibular bones comprises a solid metal needle moulded into a plastic shank, the shank being formed with means for cooperation with a dental contra-angle or straight handpiece into which the shank may be inserted. The shank has a collar at its front end, and a hollow protective cap is removably fitted over the exposed needle and engages the collar.
The device comprises a tool 21 with a cutting part 23 and a shaft 25. The shaft 25 is provided with an annular catch groove 25d and carries a sleeve 31 which encloses it and comprises a catch projection 31c which engages in the catch groove 25d so as to be detachable, wherein the shaft 25 and the sleeve 31 are rotatable relative to one another. The sleeve 31 is provided with a coolant inlet 31d which opens into an annular duct 41 enclosing the shaft 25 and communicating with a passage 43. This duct 41 is connected with the passage 43 for guiding a coolant, which passage 43 extends through the tool 21 until its cutting part 23 and opens into the surroundings at the free end of the cutting part 23 or in the vicinity of the latter. The sleeve 31 can be secured against axial displacements by means of a catch projection 31c, which is engaged in a catch groove 25d, without separate connection parts and without taking up much axial space.
There is provided a dental tool for use with a reciprocating drive means and a sleeve member operatively connected to the drive means for reciprocating motion and designed to retain a dental tool, the dental tool comprising a crank portion designed to be retained for reciprocating movement by the sleeve member of the handpiece, and a dental blade, preferably with an abrasive surface, secured to one end of the shank; in one embodiment, the dental tool is preferably hollow and further comprises an axially extending channel, preferably extending along the full length of the shank and a plenum extending within the dental blade, and outlet perforations from the plenum extending through the blade, and in a second embodiment there is further provided means secured to the shank portion for applying pressure within the channel to force any fluid material within the channel and plenum out through the outlet perforations through the blade. Finally, there is provided means for dispensing fluid material, e.g., a cleaning paste, into the shank channel comprising syringe means having a reservoir into the shank of the tool. Preferably, the tool further comprises rotation restraining means, such as an elastically deformable stop member, for providing limited resistance to rotation of the dental tool while it is being subjected to reciprocating motion and the application of axial force during dental therapy.
A dental and surgical handpiece with disposable cartridge of the present invention includes a reusable handpiece and a disposable cartridge. The disposable cartridge contains all the major moving parts that provide torque and RPM for high speed dental drilling. The disposable cartridge fits into a receptacle in the head of the reusable handpiece. The handpiece can be heat sterilized after the disposable cartridge is removed. The performance of the handpiece is not reduced by the sterilization since the turbine and bearings are contained in the disposable cartridge.
