JPH10165416A - Root canal treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the drive power of a file of a root canal treatment device before the file reaches the apex of a tooth and stop the drive of the file by installing an apex position detection means on the device to know the the top of the file comes near to the apex. SOLUTION: This device has a power part 1 with a built-in motor, and a head part 2 with a chuck mechanism rotated by the motor. A cutting tool 3 is detachably attached to the chuck mechanism to expand a root canal of a tooth. The cutting tool 3 has an ultrasonic twisting vibrator and the head part 2 has a drive means to rotate the ultrasonic twisting vibrator. The head part 2 also has an apex position detecting means 20 to detect the position of an apex by the electric resistance between a measuring electrode 4 and the opposite electrode 5. When the apex position detecting means 20 detects that the top of the cutting tool 3 comes near to a prescribed distance before the apex, a control device 10 stops the rotation of the motor, so that the device is driven only by the ultrasonic twisting vibrator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a root canal treatment device, and more particularly to a root canal treatment device suitable for use in dental root canal enlargement work in dental treatment.

[0002]

2. Description of the Related Art In dental treatment, a root canal of a tooth is cut and the root canal is sequentially enlarged to a depth reaching an apical position to insert a drug into the root canal, or to perform treatment or cleaning. For example, the casting restoration part is filled. For such a root canal enlargement of a tooth, a sharp needle-shaped root canal file is used. Conventionally, files have been driven by electromagnetic drives. For example, a file mounted on a motor-driven handpiece is cut while rotating, or a compound motion method is used in which a micro-vibration that vibrates in the axial direction of the file is superimposed on the file in addition to the rotary motion to increase cutting efficiency. Was being attempted.

As means for microvibrating the file in the axial direction, for example, an ultrasonic generating member integrally formed by stacking a large number of piezoelectric element plates polarized in the thickness direction is used. A high-frequency power supply of several tens of KHz was applied, and micro-vibration due to piezoelectric strain was transmitted to a file.

[0004]

However, in the above-mentioned root canal treatment apparatus, it is not known that the tip of the file has reached the apical position, and the overinstrument inserts the file past the apical position. There was a danger of mentation and it was very dangerous.

[0005] The present invention has been made in view of the above-mentioned circumstances, and in particular, a root apex position detecting device is provided in the above-mentioned root canal treatment device, and it is anticipated that the file tip approaches the apical position. Before the file reaches the apex position, the driving force of the file is reduced, and the over-instrumentation of the file is more effectively performed by using the ultra-long wave torsional vibration instead of the conventional ultrasonic longitudinal vibration. This is to prevent it.

[0006]

According to a first aspect of the present invention, there is provided a power unit including a motor and a head unit having a chuck mechanism rotated by the motor, and a cutting tool is detachably attached to the chuck mechanism. Attached to the cutting tool, further comprising an ultrasonic oscillator in the cutting tool, the head portion is a root canal treatment device for performing root canal enlargement and the like of teeth having a driving means for vibrating the ultrasonic oscillator, The root canal treatment device has a lead wire having a measurement electrode terminal and a lead wire having a counter electrode terminal to be hooked on the lip, characterized in that these leads are connected to apical position detection means, Thus, the root canal treatment device is provided with an apical position detection function, so that the root canal treatment operation can be performed more effectively.

According to a second aspect of the present invention, in the first aspect of the present invention, the lead wire for the measuring electrode terminal and the lead wire for the counter electrode terminal are detachable from the head portion or the power portion. Thus, the measurement electrode terminal and the counter electrode terminal are easily sterilized by an autoclave or the like.

According to a third aspect of the present invention, in the first aspect of the present invention, when the apical position detecting means detects that the cutting tool has approached a desired distance from the apical position, the rotation of the motor is reduced. The invention is characterized in that the drive is stopped and the drive is switched to the drive of only the ultrasonic vibrator, thereby preventing the risk of over-instrumentation.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the ultrasonic vibrator is an ultrasonic torsional vibrator, whereby torsional vibration is added to the cutting tool. In addition, the cutting efficiency is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing a main part of a root canal treating apparatus according to an embodiment of the present invention. In FIG. A head part 3 having a built-in chuck mechanism rotated by the motor is a cutting tool detachably mounted on the chuck mechanism, and these are conventionally known as micro-engines in the field of dental treatment. Things,
Further, in the root canal enlargement, as described above, the cutting tool 3
(Root canal file) is provided with an ultrasonic longitudinal vibrator, and a drive unit for driving the ultrasonic vibrator is provided in the head unit 2 so that micro vibration by the ultrasonic vibrator is added to rotation by the motor. I have to.

The present invention relates to a root canal treatment device as described above,
In addition to the apical position detecting device, the apical position is detected while performing a root canal enlargement operation. When the tip of the cutting tool (file) approaches the apical position, the rotation of the motor is stopped and the Only the ultrasonic vibration is used, and when the file tip approaches the apical position, the ultrasonic vibration is also stopped. In the figure, 4 is used to detect the apical position as described above. A measurement electrode terminal 5 is a counter electrode terminal used by hooking the patient's lips or the like, and a lead wire 6 connected to the measurement electrode terminal 4 through a handpiece (power unit and vibration unit) as shown in the figure. And a lead wire 7 and the like connected to the counter electrode terminal 5. The measurement electrode terminal lead wire 6 and the counter electrode terminal lead wire 7 are detachably attached to a handpiece via a connection jack 8. It is to be connected, Tokurebu is to be able to easily. The lead wire 6 for the measurement electrode terminal is shown in FIG.
As shown by a broken line inside, the head portion 2 may be taken out through the handpiece.

The motor provided in the power unit 1 and the ultrasonic vibrator driving means (excitation coil) provided in the head unit 2 are controlled by a motor rotation control and ultrasonic vibration control device 10. The control device 10 is also supplied with detection signals from the apical position measurement leads 6 and 7 described above,
The motor and the ultrasonic vibrator are driven based on the detection signal. In addition, 20 is a display unit that displays the apical position detected as described above,
Further, a warning sound such as a buzzer may be generated when the leading end of the file approaches the apical position.

FIG. 2 is a view showing details of the root canal part.
Reference numeral 30 denotes a tooth, 31 denotes a root canal, 32 denotes an apical stenosis, and 33 denotes an apical hole (here, these apical stenosis and apical hole are collectively referred to as apical position without distinction. ), For example, the tip of the cutting tool (file) 3 is 3 m from the apex position.
Until the m-position is reached (area A), rotation by a motor (10 to 1000 rgm) and torsional vibration by ultrasonic waves are applied. When approaching 3 mm from the apical position, the rotation of the motor is stopped and ultrasonic torsional vibration is applied. The control unit 10 controls so that only (region B) is set.

FIG. 3 is a diagram showing the configuration of a main part for explaining an example of an apical position detecting apparatus. In the figure, reference numeral 3 denotes a file for measuring apical hole position (or root canal length) (the torsion is superimposed on the head). The ultrasonic transducer 3a is provided integrally), 30 is a tooth whose apical position (or root canal length) is to be measured, 31 is a root canal, 14
Is a stopper, 15 is a lip, 4 is a measurement electrode terminal, 5 is a counter electrode terminal, 6 is a lead wire for a measurement electrode terminal communicating with the measurement electrode terminal 4, and 7 is a communication with the counter electrode terminal 5 hooked on the lip 15. A counter electrode terminal lead wire, 20 is a measuring instrument to which these leads 6 and 7 are connected, 21 is an apical hole position detection display unit, and the measurement electrode terminal 4 is brought into contact with the file 3 as is well known. When the file 3 is inserted into the root canal 31 in the state, it is known that the tip of the file 3 has reached the apical position from the pointer position of the apical position detection display unit 21, and in that state, the stopper 14 Is moved out of the oral cavity by moving it to the position where it hits the tooth 30, and there is a measuring instrument that measures the length from the tip of the file to the stopper, but when the tip of the cutting tool (file) 3 approaches the apical position, the measurement is taken Guide of container 20 Since it starts to shake, it can be known from this that the leading end 3 of the file has approached the apical position. (As a method of electrically detecting the apical hole position, for example, Japanese Patent Publication No. Sho 62-2187, Since many publications have been published, their details are omitted).

[0015]

According to a first aspect of the present invention, there is provided a power unit including a motor, and a head unit having a chuck mechanism rotated by the motor. A cutting tool is detachably mounted on the chuck mechanism. Further, the cutting tool is provided with an ultrasonic vibrator, and the head portion is a root canal treatment apparatus for performing root canal enlargement or the like of a tooth having a driving means for vibrating the ultrasonic vibrator, wherein the root canal treatment is performed. The apparatus has a lead wire having a measurement electrode terminal and a lead wire having a counter electrode terminal hooked to the lip, and connects these leads to apical position detecting means. Since the detection function is provided, the root canal processing operation can be performed more effectively.

According to a second aspect of the present invention, in the first aspect, the measuring electrode terminal lead wire and the counter electrode terminal lead wire are detachable from the head portion or the power portion. The terminal and the counter electrode terminal can be easily sterilized in an autoclave or the like.

According to a third aspect of the present invention, in the first aspect of the present invention, when the apex position detecting means detects that the tip of the cutting tool is approaching a desired distance before the apex position, the motor is controlled by the motor. Since the rotation is stopped and the driving is switched to the driving of only the ultrasonic vibrator, the risk of over-instrumentation can be prevented.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the invention, the ultrasonic vibrator is an ultrasonic torsional vibrator, and the ultrasonic vibration torsion vibration is added to the rotation of the motor to the cutting tool. As a result, the cutting efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of a main part for describing an embodiment of a root canal treatment apparatus according to the present invention.

FIG. 2 is a view for explaining a state of a root canal part.

FIG. 3 is a diagram for explaining an example of an apex position measuring device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power part of handpiece, 2 ... Head part, 3 ... Tooth cutting tool (faal), 4 ... Apical position measuring electrode terminal, 5 ... Counter electrode terminal, 6, 7 ... Lead wire, 8 ... Jack, 10 ...
Control device, 20: Apical position display unit, 30: Tooth, 31 ...
Root canal.

Claims (4)

[Claims] 1. A power unit having a built-in motor and a head unit having a chuck mechanism rotated by the motor, wherein a cutting tool is detachably mounted on the chuck mechanism,
Further, the cutting tool is provided with an ultrasonic vibrator, and the head portion is a root canal treatment apparatus for performing root canal enlargement or the like of a tooth having a driving means for vibrating the ultrasonic vibrator, wherein the root canal treatment is performed. The apparatus has a lead wire having a measurement electrode terminal and a lead wire having a counter electrode terminal to be hooked on the lip, and connects these leads to apical position detecting means. apparatus. 2. The root canal treatment apparatus according to claim 1, wherein the lead wire for the measurement electrode terminal and the lead wire for the counter electrode terminal are detachable from the head portion or the power portion. 3. The rotation of the motor is stopped when the tip of the cutting tool detects that the tip of the cutting tool has approached a desired distance from the apex position by the apex position detection means, and only the ultrasonic vibrator is used. 2. The root canal treatment device according to claim 1, wherein the device is switched to driving. 4. The root canal treatment device according to claim 1, wherein the ultrasonic transducer is an ultrasonic torsional transducer.