An endodontic instrument comprises three principal parts: a sleeve-shaped housing (1) one end of which is closed with a nut (2) provided with a straight-through hole; a movable bolt (3) situated axially in the housing (1); and a replaceable working nosepiece with a coupling attachment (4) to which, at the other end of the housing (1), permanently joined is a cannula (5) with the diameter of 0.30-0.35 mm inside which two thin wires with the diameter of 0.07-1.5 mm are placed to form a loop (6) outside the cannula (5), said wires being joined permanently with each other outside the attachment (4) with the use of a fastener (7). The housing (1) has, on its side surface and in its portion adjacent to the working nosepiece, a longitudinal slit (8) is provided with a width exceeding slightly the thickness of the wire which, on a portion of its length, has a recess (9) with a size exceeding slightly the size of the fastener (7), and the a movable bolt (3), on its working nosepiece side, has a properly shaped groove (10) with a shape analogous to this of the longitudinal slit (8) in the housing (1), in which there are ends of the wire fastened in a fastener (7). The fastener (7) is further situated in a widened portion of the groove (10) provided in the bolt (3) with a screw (11) screwed into opposite side of the bolt (3) for provisional adjustment of position of the bolt (3) with a knob protruding outside the nut (2) screwed onto end portion of the housing (1), whereas there is a spring (13) between the nut (2) and a seat (12) formed on the bolt (3). Side surface of the housing (1) is provided with a longitudinal recess (14) for a screw (15) used to move the bolt (1) manually and thus to draw the wire loop (6), said screw being screwed into a threaded hole provided in the bolt (3) perpendicularly to its axis.

An endodontic instrument comprises three principal parts: a sleeve-shaped housing (1) one end of which is closed with a nut (2) provided with a straight-through hole; a movable bolt (3) situated axially in the housing (1); and a replaceable working nosepiece with a coupling attachment (4) to which, at the other end of the housing (1), permanently joined is a cannula (5) with the diameter of 0.30-0.35 mm inside which two thin wires with the diameter of 0.07-1.5 mm are placed to form a loop (6) outside the cannula (5), said wires being joined permanently with each other outside the attachment (4) with the use of a fastener (7). The housing (1) has, on its side surface and in its portion adjacent to the working nosepiece, a longitudinal slit (8) is provided with a width exceeding slightly the thickness of the wire which, on a portion of its length, has a recess (9) with a size exceeding slightly the size of the fastener (7), and the a movable bolt (3), on its working nosepiece side, has a properly shaped groove (10) with a shape analogous to this of the longitudinal slit (8) in the housing (1), in which there are ends of the wire fastened in a fastener (7). The fastener (7) is further situated in a widened portion of the groove (10) provided in the bolt (3) with a screw (11) screwed into opposite side of the bolt (3) for provisional adjustment of position of the bolt (3) with a knob protruding outside the nut (2) screwed onto end portion of the housing (1), whereas there is a spring (13) between the nut (2) and a seat (12) formed on the bolt (3). Side surface of the housing (1) is provided with a longitudinal recess (14) for a screw (15) used to move the bolt (1) manually and thus to draw the wire loop (6), said screw being screwed into a threaded hole provided in the bolt (3) perpendicularly to its axis.

A dental electronic device for universal application with controlled thrust includes an elongated body inside which is positioned a battery supplying an electric motor for driving a thrust pin arranged to cooperate with a connection tip selected from a range of connection tips and being locked inside the elongated body of the pen, each tip including a fastening element for retaining the fastening element inside the elongated body and a recognition element which is activated during the connection of the tip and allowed to initialize one of the control programs previously integrated in an electronic card housed inside the body and connected to a control button placed on an outer face of the elongated body for controlling the electric motor based on the given control program of the tip so as to drive the tip.

A dental electronic device for universal application with controlled thrust includes an elongated body inside which is positioned a battery supplying an electric motor for driving a thrust pin arranged to cooperate with a connection tip selected from a range of connection tips and being locked inside the elongated body of the pen, each tip including a fastening element for retaining the fastening element inside the elongated body and a recognition element which is activated during the connection of the tip and allowed to initialize one of the control programs previously integrated in an electronic card housed inside the body and connected to a control button placed on an outer face of the elongated body for controlling the electric motor based on the given control program of the tip so as to drive the tip.

An instrument for removing fractured root canal instruments, comprising an instrument housing formed hollow at least at its front end portion, a slide which is non-rotatably held on the instrument housing but guided for translational movement in an axial direction, a threaded rod which is fixed to the slide and is engaged with a counter thread of the instrument housing or a counter member held on the instrument housing, so that a relative rotational movement between the threaded rod on the one hand and the instrument housing and/or the counter member on the other hand results in an axial displacement of the slide, and fastening means for fastening a wire to the slide, wherein the hollow instrument housing is open towards its front side, so that a wire can be guided through the open front side into the instrument housing and therein to the fastening means.

An instrument for removing fractured root canal instruments, comprising an instrument housing formed hollow at least at its front end portion, a slide which is non-rotatably held on the instrument housing but guided for translational movement in an axial direction, a threaded rod which is fixed to the slide and is engaged with a counter thread of the instrument housing or a counter member held on the instrument housing, so that a relative rotational movement between the threaded rod on the one hand and the instrument housing and/or the counter member on the other hand results in an axial displacement of the slide, and fastening means for fastening a wire to the slide, wherein the hollow instrument housing is open towards its front side, so that a wire can be guided through the open front side into the instrument housing and therein to the fastening means.

A medical tool and a method for using the medical tool removes tooth fragments, in particular tooth roots and/or remainders of tooth roots, from a tooth socket or an alveole in the region of the jaw. The medical tool includes a base and a needle disposed on the base. The needle has a retentive section and a drilling section.

A medical tool and a method for using the medical tool removes tooth fragments, in particular tooth roots and/or remainders of tooth roots, from a tooth socket or an alveole in the region of the jaw. The medical tool includes a base and a needle disposed on the base. The needle has a retentive section and a drilling section.

The cutting tool for removing a broken endodontic instrument is an attachment for a low rpm dentist's drill. The cutting tool is a hollow shaft having a drill attachment end adapted for attachment to the head of the dentist's drill and a tooth-engaging end. The tooth-engaging end of the hollow shaft has a plurality of cutting teeth for removing dentin, pulp, and other material in the area around the broken endodontic instrument. The cutting teeth may extend axially from the end of the hollow shaft or may extend laterally from the end of the hollow shaft. The cutting teeth may be sharp on both sides or edges so that the hollow shaft may be rotated either clockwise or counterclockwise, as needed. The hollow shaft is preferably made from a flexible, biocompatible material, such as a nickel-titanium alloy.

The cutting tool for removing a broken endodontic instrument is an attachment for a low rpm dentist's drill. The cutting tool is a hollow shaft having a drill attachment end adapted for attachment to the head of the dentist's drill and a tooth-engaging end. The tooth-engaging end of the hollow shaft has a plurality of cutting teeth for removing dentin, pulp, and other material in the area around the broken endodontic instrument. The cutting teeth may extend axially from the end of the hollow shaft or may extend laterally from the end of the hollow shaft. The cutting teeth may be sharp on both sides or edges so that the hollow shaft may be rotated either clockwise or counterclockwise, as needed. The hollow shaft is preferably made from a flexible, biocompatible material, such as a nickel-titanium alloy.