JPH10165415A - Root canal expanding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a root canal expanding device which can easily fair a reverse cone-shaped root canal, and which hardly damages the top of a cutting tool. SOLUTION: This device consists of a cutting tool 3 such as a reamer or a file and an ultrasonic beat vibrating member 4 to give ultrasonic beat vibration to the cutting tool 3. A root canal of a tooth is expanded by inserting the cutting tool 3 into it given beat vibration by the ultrasonic beat vibrating member 4. The vibrating member 4 may be detachably attached to the head 2 of a hand-piece 1 or may be integrally engaged in the head 2. The vibrating member 4 and the cutting tool 3 may be either integrally formed or separately formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a root canal enlargement device, and more particularly to a root canal enlargement device for expanding a root canal using a cutting tool such as a reamer or a file in dental treatment.

[0002]

2. Description of the Related Art FIG. 4 is a schematic diagram showing a main part of an example of a conventional flexible root canal enlarging device. In the drawing, reference numeral 30 denotes a handpiece, and 31 denotes a handpiece. Ultrasonic transducer (for example, magnetostrictive or electrostrictive transducer), 32
Is a horn member for transmitting the vibration of the ultrasonic transducer,
Reference numeral 40 denotes a root canal enlargement tool (for example, a file) which is detachably connected to the horn member 32 by, for example, a screw connection or the like. As is well known, the file 40 is inserted into the root canal 51 of the tooth 50, The root canal 51 is enlarged and shaped.

[0003]

However, in the root canal enlargement device as described above, the ultrasonic vibrator 31 vibrates in the direction of arrow A, and the vibration is transmitted to the file 40 through the horn member 32. Vibrates in the direction of arrow B, and the amplitude of the vibration increases at the leading end (free end) of the file 40.

[0004] Root canal enlargement involves a wide root canal opening,
Ideally, the shape is formed into an inverted conical shape (a concentric flare shape) with a narrow inner portion. However, in the conventional root canal enlargement device using flexural vibration, as described above, the amplitude of the tip of the file 40 is reduced. Is large, the root canal diameter at the back of the root canal becomes large, and as shown by the broken line 52, a cylindrical hole is formed.

Further, as described above, the amplitude of the file tip is large, so that a large force is applied to the tip of the file 40 during the root canal enlarging operation, and the file tip breaks.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstance, and makes it easy to form an inverted conical root canal.
An object of the present invention is to provide a root canal enlargement device in which the tip of the cutting tool is less likely to be broken.

[0007]

The invention according to claim 1 comprises a cutting tool such as a reamer or a file, and an ultrasonic vibrator for ultrasonically vibrating the cutting tool, wherein the cutting tool is mounted on a handpiece. In a root canal enlargement device that inserts into the root canal of a tooth and expands the root canal by vibrating with the ultrasonic transducer,
It has a torsional vibrating member, characterized in that the cutting tool is torsionally vibrated by the torsional vibrating member, thereby facilitating flare-like root canal formation,
This reduces concerns about breakage of the cutting tool.

According to a second aspect of the present invention, in the first aspect of the present invention, the cutting tool further includes a longitudinal vibration member for applying an axial vibration, so that the cutting efficiency of the cutting tool is improved. It was made.

A third aspect of the present invention is characterized in that, in the first or second aspect of the present invention, the torsional vibration member and the cutting tool are integrally formed.

A fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the vibrator is a magnetostrictive vibrator or an electrostrictive vibrator.

According to a fifth aspect of the present invention, in the first aspect of the invention, the ultrasonic transducer and the reamer or the file are coaxial with each other, and the ultrasonic transducer and the handpiece holding portion are at an angle of 100 ° or less. It is characterized in that it is attached to the handpiece at an angle of 130 °.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, there is provided a measuring electrode lead wire having a tip apex position detecting terminal at the tip thereof for contacting the cutting tool, and a counter electrode for contacting the lip. And an apex position detecting means for detecting an apical position based on a change in electrical resistance between the electrodes, and the cutting based on an output signal of the apex position detecting means. When the tip of the tool approaches the apical position, the vibration power of the ultrasonic vibrator is reduced or stopped.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing a main part of a root canal enlargement device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a handpiece, 2 denotes a head, and 3 denotes a file. ,
With a cutting tool such as a reamer, the cutting tool 3 is detachably mounted on the head 2 of the handpiece 1. The cutting tool 3 is provided with a torsional vibration member 4, and the head portion 2 is provided with a coil 5 for driving the torsional vibration member 40. The coil 5 is, for example, 20 KH.
By exciting at a frequency of z to 300 KHz, the torsional vibration member 4 performs torsional vibration, and the cutting tool 3 performs torsional (rotational) vibration. Reference numeral 18 denotes a lead wire for detecting an apex position, which will be described later. At the tip of the lead wire 18, a measurement electrode 16 that is detachably contacted with the cutting tool 3 is attached.

The handpiece 1 is straight or
90 ° to 160 ° as shown, preferably 100 °
This is a contra-type handpiece having an angle (θ) of up to 130 °, and the cutting tool 3 has a linear shape so as to be able to take a vertical position with respect to the dentition. When a certain force or more is applied to the cutting tool during the operation, the vibration is stopped or the operator is warned, as is well known.

FIG. 2 is a view showing an example of a cutting tool used for carrying out the present invention. FIG. 2A shows a structure in which the cutting tool 3 and the torsional vibration member 40 have different structures. In which the cutting tool 3 can be detachably attached to the head part 2 in advance, as shown in FIG.
FIG. 2C shows an example in which the cutting tool 3 and the torsional vibration member 4 are integrally formed, and the integrated structure is detachably mounted on the head unit 2. FIG. Member 4
a and the torsional vibration member 4b are provided so that the longitudinal vibration and the torsional vibration can be simultaneously applied to the cutting tool 3 (in this case, of course, both the separated type and the integrated type are conceivable.

FIG. 3 is a configuration diagram of a main part for explaining an example of an apex position detecting device. In the figure, reference numeral 11 denotes an apex hole position (or root canal length) measurement file, and 50 denotes an apical position (or apical position). Root canal length)
, A root canal, 14 is a stopper, 15 is a lip, 16 is a measurement electrode (file holder), 17 is a counter electrode, 18 is a measurement electrode lead wire communicating with the measurement electrode 16, and 19 is a tooth. A lead wire for the counter electrode connected to the counter electrode 17 hooked on the lip 15, a measuring device 20 to which these lead wires 18 and 19 are connected, and a reference numeral 21 for an apical hole position detection display unit, as is well known When the measurement needle 11 is inserted into the root canal 51 with the file holder (measurement electrode) 16 in contact with the needle (file) 11, the measurement needle is set from the pointer position of the apical hole position detection display unit 21. 1
When the tip of the file 1 reaches the apex position, the stopper 14 is moved to a position where it contacts the tooth 50 and taken out of the oral cavity, and the length from the tip of the file to the stopper is measured with a ruler. When the pointer approaches the tip of the cutting tool (file) 11, the pointer of the measuring instrument 21 starts to fluctuate, so that it is possible to know that the tip 11 of the file approaches the apex position. (As for a method of electrically detecting the apical hole position, a number of publications have been disclosed, including Japanese Patent Publication No. 62-2187, and the details thereof are omitted.)

In FIG. 1, a lead 18 and a terminal 16
Works in the same manner as the lead wire 18 and the measuring terminal 16 shown in FIG. 3, and the lead wire 18 and the terminal 16 are provided on the handpiece 1 as shown in FIG. If it is possible to detect the apical position, it can be understood that the file (cutting tool) 3 has approached the apical position. In that case, the vibration power of the ultrasonic transducer is weakened, or Try to stop. This way,
There is no danger of files being inserted beyond the apex.

[0018]

As is apparent from the above description, according to the present invention, the root canal can be expanded more safely and effectively than the conventional root canal enlargement device using flexural vibration.・ Concentric conical uniform enlargement, which was difficult with the conventional flexural vibration ultrasonic root canal enlargement device, can be easily performed. ・ Concentric circle by using a tapered file or reamer as a cutter. The flare can be easily formed, and the breakage of the cutting tool can be greatly reduced as compared with the conventional ultrasonic root canal enlargement device using flexural vibration.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a main part for explaining an example of a root canal enlargement device according to the present invention.

FIG. 2 is a view showing an example of a cutting tool used for carrying out the present invention.

FIG. 3 is a main part configuration diagram for explaining an example of an apical position detection device.

FIG. 4 is a schematic diagram of a main part for explaining an example of a conventional flexible root canal enlarging device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hand piece, 2 ... Head part, 3 ... Cutting tool, 4 ... Torsion vibration member, 4a ... Longitudinal vibration element, 4b ... Torsion vibration element, 5 ... Drive coil, 11 ... Position of apical hole (or root canal) Long)
Measurement file, 14 ... stopper, 15 ... lips, 16 ...
Measurement electrode (file holder), 17 ... counter electrode, 18
... lead wire for measurement electrode, 19 ... lead wire for counter electrode, 2
0: measuring instrument, 21: apical hole position detection display unit, 30: handpiece, 31: ultrasonic transducer, 40: file, 50
... teeth, 51 ... root canal.

Claims (6)

[Claims] 1. A cutting tool such as a reamer or a file, and an ultrasonic vibrator for ultrasonically vibrating the cutting tool. The cutting tool is attached to a handpiece and inserted into a root canal of a tooth. A root canal enlargement device for enlarging a root canal by vibrating with an ultrasonic vibrator, comprising a torsional vibrating member, wherein the torsion vibrating member causes the cutting tool to torsionally vibrate. Magnifying device. 2. The root canal enlargement device according to claim 1, wherein the cutting tool further includes a longitudinal vibration member for applying vibration in an axial direction. 3. The root canal enlargement device according to claim 1, wherein the torsional vibration member and the cutting tool are integrally formed. 4. The root canal enlargement device according to claim 1, wherein the vibration member is a magnetostrictive vibrator or an electrostrictive vibrator. 5. The ultrasonic vibrator and the reamer or file are coaxial with each other, and the handpiece gripping part is 10 mm.
The root canal enlargement device according to any one of claims 1 to 4, wherein the root canal enlargement device is attached to the handpiece at an angle of 0 ° to 130 °. 6. A lead wire for a measurement electrode having a tip at an apex position detection terminal contacting the cutting tool, and a lead wire for a counter electrode having a tip electrode opposed to a lip,
Apical position detecting means for detecting an apical position based on a change in electrical resistance between these electrodes, and when the tip of the cutting tool approaches the apical position by an output signal of the apical position detecting means, The root canal enlargement device according to any one of claims 1 to 5, wherein the vibration power of the sonic vibrator is reduced or stopped.