A nickel-titanium file root canal preparation instrument, including a nickel-titanium preparation system and a water flushing system. The nickel-titanium preparation system includes a nickel-titanium file, a handheld device head, a handheld device body, an electric motor, and a power controller; the water flushing system includes a conduit, a conduit fixing device, a liquid pump, and a liquid pump controller. The existing theory and study regarding root canal preparation has misled people about the root canal preparation method, and this leads to the result that the existing nickel-titanium root canal preparation is implemented in a dry-drilling manner. By providing a water flow to perform flushing during the root canal preparation of the nickel-titanium file root canal preparation instrument, the service life of the nickel-titanium file is prolonged.

Provided are a dental apparatus and a dental system using the dental apparatus, the dental apparatus including a signal detector configured to detect an electrical signal varying according to a distance between a file inserted into a tooth and an apical foramen, and a controller configured to execute a first mode for calculating the distance between the apical foramen and the file by using the electrical signal and for displaying the distance on a screen, and configured to execute a second mode for displaying root canal working length information and identification information received through a communication part or input part, on the screen, for generating identified root canal working length information by using the root canal working length information and the identification information, and for transmitting the identified root canal working length information to the external device through the communication part according to the input signal.

Provided are a dental apparatus and a dental system using the dental apparatus, the dental apparatus including a signal detector configured to detect an electrical signal varying according to a distance between a file inserted into a tooth and an apical foramen, and a controller configured to execute a first mode for calculating the distance between the apical foramen and the file by using the electrical signal and for displaying the distance on a screen, and configured to execute a second mode for displaying root canal working length information and identification information received through a communication part or input part, on the screen, for generating identified root canal working length information by using the root canal working length information and the identification information, and for transmitting the identified root canal working length information to the external device through the communication part according to the input signal.

To reliably follow a tip end portion of a root canal and prevent biting into a root canal wall. A dental root canal treatment tool includes a shaft portion (A), a transition portion (D) formed continuously to the shaft portion, and a working portion (B) formed continuously to the transition portion. The working portion is formed in such a tapered shape that the working portion is narrowed from the transition portion to a tip end. A cross section (IIa) of the working portion closest to a shaft portion side is in a parallelogram shape having a pair of opposing long sides (1a), a pair of opposing short sides (2a), sharp edges (5a) formed on a long diagonal line (3a), and obtuse edge (6a) formed on a short diagonal line (4a). A cross section (IIb) of the working portion in the vicinity of the tip end thereof is in a shape having a pair of sides (1b) formed continuously from the long sides (1a), a pair of sides (2b) formed continuously from the short sides (2a), lands (7) formed continuously from the sharp edges on the long diagonal line (3b) and increasing in length from the shaft portion side to the vicinity of the tip end, and obtuse edges (6b) formed continuously to the obtuse edges on the short diagonal line (4b).

To reliably follow a tip end portion of a root canal and prevent biting into a root canal wall. A dental root canal treatment tool includes a shaft portion (A), a transition portion (D) formed continuously to the shaft portion, and a working portion (B) formed continuously to the transition portion. The working portion is formed in such a tapered shape that the working portion is narrowed from the transition portion to a tip end. A cross section (IIa) of the working portion closest to a shaft portion side is in a parallelogram shape having a pair of opposing long sides (1a), a pair of opposing short sides (2a), sharp edges (5a) formed on a long diagonal line (3a), and obtuse edge (6a) formed on a short diagonal line (4a). A cross section (IIb) of the working portion in the vicinity of the tip end thereof is in a shape having a pair of sides (1b) formed continuously from the long sides (1a), a pair of sides (2b) formed continuously from the short sides (2a), lands (7) formed continuously from the sharp edges on the long diagonal line (3b) and increasing in length from the shaft portion side to the vicinity of the tip end, and obtuse edges (6b) formed continuously to the obtuse edges on the short diagonal line (4b).

A dental treatment tool guiding device (1) is a device for guiding a dental treatment tool (3) to a treatment target position (g) of a tooth (a) to be treated. The dental treatment tool guiding device (1) is provided with a guiding tool (2) that has an inlet port (2a), a hollow portion (2b), and an outlet port (2c) for inserting the dental treatment tool (3) therethrough, and that guides the dental treatment tool (3). The outlet port (2c) is open in a direction different from the introducing direction of the dental treatment tool (3). The hollow portion (2b) extends in a direction from the inlet port (2a) to the tip of the guiding tool (2), and has a tip side curved in the direction of the outlet port (2c).

A dental treatment tool guiding device (1) is a device for guiding a dental treatment tool (3) to a treatment target position (g) of a tooth (a) to be treated. The dental treatment tool guiding device (1) is provided with a guiding tool (2) that has an inlet port (2a), a hollow portion (2b), and an outlet port (2c) for inserting the dental treatment tool (3) therethrough, and that guides the dental treatment tool (3). The outlet port (2c) is open in a direction different from the introducing direction of the dental treatment tool (3). The hollow portion (2b) extends in a direction from the inlet port (2a) to the tip of the guiding tool (2), and has a tip side curved in the direction of the outlet port (2c).

Methods for manufacturing an endodontic instrument or device, such as an endodontic file for use in performing root canal therapy on a tooth, are disclosed. The method may include the steps of: (a) providing a wire or wire blank comprising a nickel titanium alloy that has been heat-treated at a heat-treat temperature and has an angle greater than 5 degrees of permanent deformation after torque at 45 degrees of flexion tested in accordance with ISO Standard 3630 Part 1: General requirements and test methods and (b) removing material from the wire or wire blank to form an endodontic instrument or device. The method may include the steps of: (a) providing a wire or wire blank comprising a nickel titanium alloy at a first temperature; and (b) removing material from the wire or wire blank at a second temperature above the first temperature to form an endodontic instrument or device.

Methods for manufacturing an endodontic instrument or device, such as an endodontic file for use in performing root canal therapy on a tooth, are disclosed. The method may include the steps of: (a) providing a wire or wire blank comprising a nickel titanium alloy that has been heat-treated at a heat-treat temperature and has an angle greater than 5 degrees of permanent deformation after torque at 45 degrees of flexion tested in accordance with ISO Standard 3630 Part 1: General requirements and test methods and (b) removing material from the wire or wire blank to form an endodontic instrument or device. The method may include the steps of: (a) providing a wire or wire blank comprising a nickel titanium alloy at a first temperature; and (b) removing material from the wire or wire blank at a second temperature above the first temperature to form an endodontic instrument or device.

The invention relates to a root canal instrument having a shank and a working area attached to the shank, wherein the working area consists of a nickel-titanium alloy comprising 38 to 46 at % nickel, 46 to 53 at % titanium and 5.5 to 8.8 at % copper. The invention relates to a root canal instrument having a shank and a working area attached to the shank, wherein the working area consists of a nickel-titanium alloy comprising 38 to 46 at % nickel, 46 to 53 at % titanium and 5.5 to 8.8 at % copper.