JP2013172838A - Dental treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dental treatment device which reduces a user's operation of discriminating between cutting tools and which can select drive appropriate for a shape of the cutting tool.SOLUTION: A dental treatment device 100 includes a hand piece 1, a power source (micromotor 7), a drive unit (motor driver 13), and a control unit 11. The hand piece 1 makes a head part 2 drivably hold a cutting tool 5. The power source drives the cutting tool 5. The drive unit drives the cutting tool 5 in such a manner that first drive for driving the cutting tool 5 in a normal-rotation state and second drive for driving the cutting tool 5 by repeating normal rotation and reverse rotation in a predetermined pattern can be switched, in the case where a rotation direction of making the cutting tool 5 cut a cutting object is a normal-rotation direction and where a rotation direction opposite to the normal-rotation direction is a reverse-rotation direction. The control unit 11 switches between the first drive and the second drive in the drive unit on the basis of information obtained from the cutting tool 5.

Description

  The present invention relates to a dental treatment apparatus including a handpiece, and more particularly, to a cutting tool for cutting and enlarging an inner wall of a root canal of a tooth or a dental treatment apparatus for driving the cutting tool.

  2. Description of the Related Art Some dental treatment apparatuses including a handpiece perform a treatment for cutting and expanding a tooth root canal by attaching and driving a cutting tool to a head portion of a handpiece. Various driving controls are disclosed in Patent Documents 1 to 3 in order to prevent damage caused by a load applied to the cutting tool when the dental treatment device drives the cutting tool to enlarge the root canal of the tooth. Has been.

  The dental treatment device disclosed in Patent Document 1 includes a detection unit that detects a load applied to the cutting tool, and a control unit that reverses the cutting tool driving motor when the detected load reaches a preset reference. It has.

  The dental treatment apparatus disclosed in Patent Document 2 includes a driving unit that drives a cutting tool, a load detection unit that detects a load applied to the cutting tool, and a root canal length that measures the root canal length using the cutting tool. Measuring means, reference load setting means for arbitrarily setting a reference load in advance, and control means for controlling the drive means are provided. When the detected load detected by the load detecting unit exceeds the reference load, the control unit stops driving the cutting tool, decreases the driving amount, reverses rotation, rotates so that the load applied to the cutting tool is reduced. The driving means is controlled by either the forward rotation or the reversal operation. Further, the control means controls the driving means so as to reduce the driving amount of the cutting tool as the distance from the cutting tool to the apex becomes smaller, based on the measured value of the root canal length by the root canal length measuring means.

  The dental treatment device disclosed in Patent Document 3 is based on a driving means for driving a cutting tool, a root canal length measuring means for measuring a root canal length, and a measured value of the root canal length by the root canal length measuring means. Control means for controlling the drive means so that the drive force of the cutting tool changes. The control means includes rotation speed control means for controlling the rotation speed of the cutting tool. The rotation speed control means controls the drive means so as to decrease the rotation speed of the cutting tool as the distance from the cutting tool to the apex decreases based on the measured value of the root canal length by the root canal length measurement means.

  In addition to cutting tools that have blades shaped to cut teeth by rotating in one direction, in recent years, teeth are cut by alternately rotating in one direction and the opposite direction. Some of them have a blade shape. And the dental treatment apparatus which drives the cutting tool which rotates one direction and a reverse direction alternately is disclosed by patent document 4. FIG.

  In the dental treatment device disclosed in Patent Document 4, the cutting tool is rotated clockwise or counterclockwise by a desired first rotation angle, and then the instrument is continuously referred to as the first rotation angle. Rotate in the opposite direction by a second rotation angle. The first rotation angle is larger than the second rotation angle so that the cutting piece is discharged upward from the surface of the root canal.

Japanese Patent No. 3264607 Japanese Patent No. 3676753 Japanese Patent No. 3615209 Special table 2003-504113 gazette

  However, the cutting tool has a needle shape with a length of about several tens of millimeters, and a shape in which a blade is formed so as to cut teeth by rotating in one direction (normal shape), and a direction opposite to one direction. It is difficult for the user to distinguish the shape (twist shape) in which the blade is formed so as to cut the tooth by alternately rotating and.

  In addition, since a normal-shaped cutting tool and a twist-shaped cutting tool can be held in the head part of the handpiece, the user can use a normal-shaped cutting tool and a twist-shaped cutting tool. They are replaced as needed.

  For this reason, in clinical sites where dental treatment devices are used, there are cases where normal-shaped cutting tools and twist-shaped cutting tools are mixed, and the user performs normal-shaped cutting tools and twist-shaped cutting tools during treatment. The operation of identifying the tool was complicated.

  Also, when a normal-shaped cutting tool is erroneously driven to rotate alternately in one direction and the opposite direction, or a twist-shaped cutting tool is erroneously rotated in one direction. In such a case, the dental treatment apparatus has a problem that a necessary cutting ability cannot be obtained or an excessive cutting ability is obtained.

  Therefore, the present invention has been made to solve the above-described problems, and it is possible to reduce the work of the user who identifies the cutting tool and to select an appropriate drive suitable for the shape of the cutting tool. An object of the present invention is to provide a dental treatment apparatus.

  In the dental treatment device according to the present invention, a handpiece that holds the cutting tool in a drivable manner, a power source for driving the cutting tool, and a rotational direction in which the cutting tool cuts the cutting object are aligned on the head portion. When the reverse rotation direction of rotation and forward rotation is reversed, the first drive that drives the cutting tool by rotating it forward and the second drive that drives the cutting tool by repeating forward rotation and reverse rotation in a predetermined pattern A drive unit that drives the cutting tool and a control unit that switches between the first drive and the second drive in the drive unit based on information obtained from the cutting tool are provided.

  Preferably, the information processing apparatus further includes a notification unit that notifies the user whether the control switched by the control unit is the control of the first drive or the second drive.

  Preferably, the information obtained from the cutting tool is used to identify driving information indicating a driving state of the cutting tool and whether the first cutting tool suitable for the first driving or the second cutting tool suitable for the second driving. At least one of the identification information.

  Preferably, the cutting tool has an identification tag or an identification shape for identifying whether the cutting tool is the first cutting tool or the second cutting tool, and the control unit obtains identification information from the identification tag or the identification shape of the cutting tool. Based on the read and identification information, the drive is switched to the first drive or the second drive before the cutting tool is driven.

  Preferably, a load detection unit that detects a load applied to the driving cutting tool is further provided, and the control unit uses the load detected by the load detection unit as drive information, and drives the cutting tool by the first drive to be cut. The first drive or the second drive based on the difference between the load of the cutting tool generated when cutting an object and the load of the cutting tool generated when the cutting tool is driven by the second drive to cut the object to be cut Switch to driving with.

  Preferably, the control unit switches the control from the first drive to the second drive or from the second drive to the first drive when the load becomes equal to or higher than a predetermined reference load.

  Preferably, further comprising a root canal length measurement unit that electrically measures the position of the tip of the cutting tool in the root canal, and the control unit uses the position of the tip of the cutting tool measured by the tube length measurement unit as drive information, Based on the difference between the change in position when cutting the cutting object by driving the cutting tool with the first drive and the change in position when cutting the cutting object by driving the cutting tool with the second drive. The driving is switched to the first driving or the second driving.

  Preferably, the control unit switches the control from the first drive to the second drive or from the second drive to the first drive when the position of the tip of the cutting tool reaches a predetermined reference position.

Preferably, the notification unit is a display unit and is provided on the handpiece.
Preferably, the power source is an electric drive motor.

  Since the dental treatment apparatus according to the present invention switches between the first drive and the second drive in the drive unit based on information obtained from the cutting tool, it is possible to select an appropriate drive that matches the shape of the cutting tool. It is possible, and a user's operation | work which identifies a cutting tool can be reduced. In addition, the dental treatment apparatus according to the present invention can prevent the cutting tool from being damaged by switching between the first drive and the second drive in the drive unit based on information obtained from the cutting tool, The object to be cut can be cut safely.

It is the schematic which shows the structure of the external appearance of the root canal treating device which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the function of the root canal treating device which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows the circuit structure of the root canal treating device which concerns on Embodiment 1 of this invention. It is the schematic diagram which showed the rotation direction of the cutting tool in the case of carrying out normal drive, and the case of carrying out twist drive. It is a figure which shows the example of a display of the liquid crystal display panel provided in the display part shown in FIG. 5 is a flowchart for explaining a method of selecting an appropriate drive that matches the shape of the cutting tool held in the head part in the root canal treating device according to the first embodiment of the present invention. 6 is a flowchart showing an example of switching of driving of a cutting tool in the root canal treating device according to the second embodiment. 10 is a flowchart illustrating another example of switching of driving of a cutting tool in the root canal treating device according to the second embodiment. It is the schematic which shows the structure of a cordless type root canal treatment device.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
(Embodiment 1)
The dental treatment apparatus according to Embodiment 1 of the present invention is a root canal treatment device including a root canal enlargement and root canal length measurement system incorporating a dental root canal treatment handpiece. However, the dental treatment device according to the present invention is not limited to a root canal treatment device, and can be applied to a dental treatment device having a similar configuration.

  FIG. 1 is a schematic diagram showing an external configuration of a root canal treating device according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing a functional configuration of the root canal treating device according to the first embodiment of the present invention. A root canal treatment device 100 shown in FIG. 1 includes a handpiece 1, a motor unit 6, and a control box 9 for dental root canal treatment.

  A dental root canal treatment handpiece 1 includes a head portion 2, a narrow neck portion 3 connected to the head portion 2, and a grip portion 4 connected to the neck portion 3 and gripped by fingers. Yes. A motor unit 6 for rotationally driving the cutting tool 5 held by the head portion 2 is detachably connected to the base portion of the grip portion 4. A dental instrument 10 is configured with the motor unit 6 connected to the handpiece 1.

  As shown in FIG. 2, the motor unit 6 has a built-in micromotor 7 and a power supply lead wire 71 for supplying power to the micromotor 7 and a signal for transmitting a signal to a root canal length measuring circuit 12 described later. It is connected to the control box 9 through a hose 61 having a lead wire 8 and the like. Here, the signal lead 8 is part of a conductor that is electrically connected to the cutting tool 5 through the motor unit 6 and the handpiece 1 and transmits an electric signal. The cutting tool 5 serves as one electrode of the root canal length measurement circuit 12.

  The control box 9 includes a control unit 11, a root canal length measurement circuit 12, a motor driver 13, a reference setting unit 14, an operation unit 15, a display unit 16, a notification unit 17, and the like. As shown in FIG. 1, the control box 9 has a holder 10a attached to the side of the main body to hold the instrument 10 when not in use. In addition, a foot controller 18 is connected to the control box 9, and a lead wire 19 that is electrically connected to the root canal length measuring circuit 12 is further connected. The lead wire 19 may take the form of branching from the middle of the hose 61. An oral electrode 19a hung on the patient's lips is attached to the distal end of the lead wire 19 in an electrically conductive state. The oral electrode 19a serves as the other electrode of the root canal length measurement circuit 12.

  The control unit 11 controls the entire root canal enlargement and root canal length measurement system, and the main part is composed of a microcomputer. A root canal length measurement circuit 12, a motor driver 13, a reference setting unit 14, an operation unit 15, a display unit 16, a notification unit 17, and a foot controller 18 are connected to the control unit 11. When the rotation direction in which the cutting tool 5 cuts the object to be cut is normal rotation and the reverse rotation direction of normal rotation is reverse rotation, the control unit 11 performs reverse rotation drive and normal rotation drive. Reverse drive can be switched. Furthermore, the control unit 11 performs normal driving (first driving) for driving the cutting tool 5 by normal rotation, and twist driving (first driving) for driving the cutting tool 5 by repeating normal rotation and reverse rotation in a predetermined pattern. 2 drive).

  The root canal length measurement circuit 12 forms a closed circuit with the cutting tool 5 inserted into the root canal of the tooth as one electrode and the oral electrode 19a hung on the patient's lip as the other electrode. Then, the root canal length measurement circuit 12 applies a voltage between the cutting tool 5 and the oral electrode 19a, and measures the impedance between the cutting tool 5 and the oral electrode 19a, thereby detecting the root apex position of the tooth. The distance to the tip of the cutting tool 5 can be measured. When the root canal length measurement circuit 12 detects that the tip of the cutting tool 5 has reached the apex position, the amount of insertion of the cutting tool, that is, the distance from the root canal opening to the tip of the cutting tool is set as the root canal length. Can do. In addition, the electrical root canal length measuring method for measuring the impedance between the cutting tool 5 and the oral electrode 19a and measuring the root canal length is a known method, and the root canal according to Embodiment 1 of the present invention. All known methods for measuring the electrical root canal length can be applied to the treatment device 100.

  The motor driver 13 is connected to the micromotor 7 via a power supply lead wire 71 and controls the power supplied to the micromotor 7 based on a control signal from the control unit 11. The motor driver 13 controls the power supplied to the micro motor 7 to control the rotation direction, rotation speed, rotation angle, etc. of the micro motor 7, that is, the rotation direction, rotation speed, rotation angle, etc. of the cutting tool 5. Can do.

  The reference setting unit 14 sets a reference for switching the driving of the cutting tool 5. For example, the reference setting unit 14 uses the root canal length measurement circuit 12 to set in advance the apex position or a position at a predetermined distance from the apex position as the reference position, and the tip of the cutting tool 5 is set to this reference position. When reached, the drive of the cutting tool 5 is automatically switched. Further, the reference setting unit 14 sets in advance a load that the cutting tool 5 allows as a reference load, and automatically switches the driving of the cutting tool 5 when the load of the cutting tool 5 reaches the reference load. The driving of the cutting tool 5 to be switched may include driving for stopping or reversely rotating. The operation unit 15 can select whether or not to perform such control as automatic switching.

  The operation unit 15 can select whether or not to perform control such as automatic switching, and can also set whether or not to perform root canal length measurement. Further, the operation unit 15 can manually perform switching between normal rotation driving and reverse rotation driving and switching between normal driving and twist driving.

  As will be described later, the display unit 16 displays the position of the tip of the cutting tool 5 in the root canal, the rotation direction, the number of rotations, and the rotation angle of the cutting tool 5. Furthermore, information for the notification unit 17 to notify the user can be displayed on the display unit 16.

  The notification unit 17 notifies the drive state of the cutting tool 5 currently performed by the control unit 11 by light, sound, vibration, or the like. Specifically, the notification unit 17 is provided with an LED (Light Emitting Diode), a speaker, a vibrator, or the like as necessary in order to notify the driving state of the cutting tool 5 and emits light in normal driving and twist driving. Change the color of the sound or change the sound output from the speaker. In addition, the notification part 17 does not need to provide LED, a speaker, a vibrator | oscillator, etc. separately, when the display part 16 can display the drive state of the cutting tool 5 with respect to a user.

  The foot controller 18 is an operation unit that performs drive control of the cutting tool 5 by the micromotor 7 by a stepping operation. The drive control of the cutting tool 5 by the micromotor 7 is not limited to the foot controller 18, and an operation switch (not shown) is provided in the grip portion 4 of the handpiece 1. May be used to control the driving of the cutting tool 5. In addition, for example, when the foot controller 18 is being stepped on, the root canal length measurement circuit 12 detects that the cutting tool 5 has been inserted into the root canal, and the rotation of the cutting tool 5 is performed. May be started.

  In addition, although the control box 9 of the root canal treatment device 100 has been described with respect to a configuration in which the control box 9 is placed and used on a tray table or a side table installed on the side of a dental examination table, the present invention is not limited thereto. Alternatively, the control box 9 may be incorporated in the tray table or side table.

  Next, the circuit configuration of the root canal treating device 100 that performs drive control of the cutting tool 5 will be described in more detail. FIG. 3 is a circuit diagram showing a circuit configuration of the root canal treating device 100 according to Embodiment 1 of the present invention. In the root canal treatment device 100 shown in FIG. 3, the micromotor 7, the control unit 11, the root canal length measurement circuit 12, the motor driver 13, and the reference setting unit 14 related to the drive control of the cutting tool 5 are illustrated. is there.

  Further, the motor driver 13 includes a transistor switch 13a, a transistor driver circuit 13b, a rotation direction changeover switch 13c, and a load detection resistor 13d. The reference setting unit 14 includes a variable resistor 14a for setting a reference load, a variable resistor 14b for setting a duty, and a variable resistor 14c for setting a reference position. The reference setting unit 14 is connected to the main power source 20 and the main switch 21 of the root canal treating device 100. Although not shown, the cutting tool 5 is held by the micromotor 7 via an appropriate gear mechanism or the like.

  The transistor driver circuit 13b is operated by a control signal output from the port 11a of the control unit 11, and drives the micro motor 7 by controlling on / off of the transistor switch 13a. The micromotor 7 rotates normally or reversely according to the state of the rotation direction changeover switch 13c. When the control signal output from the port 11a of the control unit 11 is, for example, a pulse waveform repeated at a constant cycle, the pulse width, that is, the duty ratio is adjusted by the variable resistance 14b for setting the duty of the reference setting unit 14 Is done. The micromotor 7 rotationally drives the cutting tool 5 in accordance with this duty ratio.

  The rotation direction change-over switch 13c is a control signal output from the port 11b of the control unit 11, and switches whether the cutting tool 5 is driven to rotate normally or is driven to rotate backward. The controller 11 detects the load applied to the cutting tool 5 by inputting the resistance value of the load detection resistor 13d to the port 11c. Further, the control unit 11 inputs the root canal length measured by the root canal length measuring circuit 12 to the port 11d. With the above configuration, the micromotor 7 and the cutting tool 5 are driven by various driving methods such as normal driving only for normal rotation, normal driving only for reverse rotation, and twist driving for repeating normal rotation and reverse rotation at a predetermined angle.

Next, the relationship between the shape of the cutting tool 5 and drive control will be described.
In the cutting tool 5, the shape of the blade (normal shape) formed so as to cut the inner wall of the root canal of the tooth by normal rotation, and the root of the tooth by alternately rotating forward and reverse. There is a shape (twist shape) in which the blade is formed so as to cut the inner wall of the tube. The user can freely exchange the normal-shaped cutting tool 5 and the twist-shaped cutting tool 5. Therefore, in the clinical field, there are cases where the normal-shaped cutting tool 5 and the twist-shaped cutting tool 5 are mixed, and the user determines whether the normal-shaped cutting tool 5 is the twist-shaped cutting tool 5 during the operation. It was necessary to identify and select an appropriate drive suitable for the shape of the cutting tool 5.

  FIG. 4 is a schematic diagram showing the rotation direction of the cutting tool 5 in the case of normal driving and in the case of twist driving. FIG. 4A shows the rotation direction of the cutting tool 5 in the case of normal driving, and FIG. 4B shows the rotation direction of the cutting tool 5 in the case of twist driving. In the normal drive shown in FIG. 4A, the cutting tool 5 is rotated clockwise toward the tip direction of the cutting tool 5, and this rotation is normal rotation. The root canal treatment device 100 can appropriately cut the inner wall of the root canal of the tooth by performing the normal driving shown in FIG. .

  On the other hand, in the twist drive shown in FIG. 4B, the forward rotation that rotates the cutting tool 5 clockwise and the reverse rotation that rotates counterclockwise are performed alternately facing the tip direction of the cutting tool 5. In the twist drive, for example, a rotation of 90 degrees in the forward rotation direction and a rotation of 90 degrees in the reverse rotation direction are alternately performed. The root canal treating device 100 can appropriately cut the inner wall of the tooth root canal by performing the twist driving shown in FIG. 4B when the twist-shaped cutting tool 5 is held in the head portion 2. .

  Next, the display of the liquid crystal display panel provided in the display unit 16 shown in FIG. 1 will be described. FIG. 5 is a diagram showing a display example of a liquid crystal display panel provided in the display unit 16 shown in FIG.

  The display unit 16 shown in FIG. 5 is a liquid crystal display panel. The display unit 16 includes a dot display unit 52 including a number of elements for displaying the measured root canal length in detail, and displays the root canal length in zones in stages. A zone display unit 54 for displaying the boundary, a boundary display unit 56 indicating the boundary of each zone, and an arrival rate display unit 58 for displaying the arrival rate to the apex.

  The dot display unit 52 displays elements in order from top to bottom as the tip of the cutting tool 5 approaches the apex. The position of the scale “APEX” represents the position of the apex, and when the element reaches the scale, it indicates that the tip of the cutting tool 5 has almost reached the position of the apex.

  In addition, the display unit 16 includes a dot display unit 60 including a large number of elements for displaying the load detected by the load detection resistor 13d, and a zone display unit 62 for displaying the load in zones and in stages. Are provided. The dot display unit 60 displays elements in order from top to bottom as the load detected by the load detection resistor 13d increases.

  For example, on the dot display unit 60, the load of the cutting tool 5 applied when cutting a tooth is displayed by an element 60a indicated by diagonal lines. The dot display unit 60 may have a peak hold function to prevent frequent display switching, and may display the maximum load value detected within a predetermined time for a certain period of time.

  Further, the dot display unit 60 may display an element 60b corresponding to the reference load set by the reference load setting variable resistor 14a. By displaying the element 60b on the dot display unit 60, it is possible to visualize how much margin is present in the load detected by the load detection resistor 13d with respect to the reference load.

  Further, the display unit 16 displays a numerical value display unit 64 that displays numerical values of the rotational speed of the cutting tool 5 and the load applied to the cutting tool 5, the rotation direction (forward S, reverse R) of the cutting tool 5, and the cutting tool. A rotation display unit 68 for displaying the magnitude of the number of rotations of 5 is provided.

  Next, a configuration in which the root canal treating device 100 according to the first embodiment switches between normal driving and twist driving based on information obtained from the cutting tool 5 will be described. First, the case where the identification information for identifying a cutting tool is utilized as information obtained from the cutting tool 5 is shown. Specifically, identification tags 5a and 5b for identifying whether the cutting tool 5 is a normal-shaped cutting tool (first cutting tool) or a twist-shaped cutting tool (second cutting tool) as shown in FIG. The case of having

  The identification tag 5a is, for example, an IC tag, and the cutting tool 5 has a normal shape and information such as a manufacturing number is written therein. Similarly, the identification tag 5b is also an IC tag, for example, and the cutting tool 5 has a twisted shape and information such as a manufacturing number is written therein. When the cutting tool 5 having the identification tags 5a and 5b is held in the head unit 2 as shown in FIG. 4, an IC tag reading sensor (not shown) provided in advance in the head unit 2 is used for the cutting tool 5. The information of the shape of the cutting tool 5 is read from the identification tags 5a and 5b. The IC tag reading sensor outputs the read information on the shape of the cutting tool 5 to the control unit 11, and the control unit 11 performs control so that the drive control of the cutting tool 5 is switched to normal driving or twist driving.

  The identification information for identifying whether the cutting tool is a normal shape or a twist shape is not limited to an IC tag, and may be a two-dimensional bar code, a magnetic tag, or the like. Furthermore, it is good also as identification information by changing the shape of the holding | maintenance part of the cutting tool 5 by whether it is a normal-shaped cutting tool or a twist-shaped cutting tool (identification shape). For example, in the case of a normal-shaped cutting tool, it is shaped so as not to come into contact with a certain contact provided in the head part 2 when held in the head part 2, but in the case of a twist-shaped cutting tool, it is held in the head part 2. In some cases, the contact portion is in contact with a certain contact provided in the head portion 2.

  Next, a case where drive information representing the drive state of the cutting tool is used as information obtained from the cutting tool 5 will be described. Specifically, the shape of the held cutting tool 5 is determined by utilizing the difference between the load applied when the cutting tool 5 held in the head unit 2 is driven by normal driving and the load applied when driven by twist driving. Identify.

  FIG. 6 is a flowchart for explaining a method of selecting an appropriate drive suitable for the shape of the cutting tool 5 held by the head unit 2 in the root canal treating device 100 according to the first embodiment of the present invention. First, the controller 11 determines whether or not the cutting tool 5 has an identification tag (step S61). When it is determined that the cutting tool 5 has an identification tag (step S61: YES), the control unit 11 determines whether or not the shape of the cutting tool 5 is a twist shape based on the identification information read from the identification tag. Is determined (step S62).

  When it is determined in step S62 that the shape of the cutting tool 5 is a twisted shape (step S62: YES), the control unit 11 drives the cutting tool 5 held on the head unit 2 by twist driving (step S63). On the other hand, when it determines with the shape of the cutting tool 5 not being a twist shape in step S62 (step S62: NO), the control part 11 drives the cutting tool 5 hold | maintained at the head part 2 by normal drive (step S64).

  Returning to step S61, when the control unit 11 determines that the cutting tool 5 does not have an identification tag (step S61: NO), the control unit 11 performs driving (determination driving) for determining the shape of the cutting tool 5. Implement (step S65). In addition, although the example which implements the drive for determination when the cutting tool 5 does not have an identification tag is demonstrated, you may implement the drive for determination when the cutting tool 5 has an identification tag. Here, the determination drive may be performed using a dedicated cutting object or may be performed using the inner wall of the root canal of the tooth to be treated. Further, when the determination drive is performed using the inner wall of the root canal of the tooth to be treated, a part of the period of cutting the tooth, for example, a certain period after the start of cutting is used as the determination drive. Also good.

  Here, the shape of the held cutting tool 5 is identified using the difference between the load applied when the cutting tool 5 held on the head unit 2 is driven by normal driving and the load applied when driven by twist driving. The principle that can be done will be described. The cutting tool 5 having a normal shape has a blade formed so as to cut an object to be cut when it is driven by normal driving (during normal rotation). The load applied to is reduced. On the other hand, the twist-shaped cutting tool 5 is formed with a blade so that the object to be cut can be cut by alternately rotating forward and reverse, so that the twist-shaped cutting tool 5 is rotated forward compared to the normal-shaped cutting tool 5. The load applied to is small, and the load applied during reverse rotation is large.

  Therefore, when the shape of the cutting tool 5 held in the head unit 2 is a normal shape, the difference between the load applied when driven by normal drive and the load applied when driven by twist drive is compared to the case of twist shape. Become bigger. Therefore, whether or not the difference between the load applied when the cutting tool 5 held in the head unit 2 is driven by normal driving and the load applied when driven by twist driving is equal to or greater than a predetermined reference value, The shape of the held cutting tool 5 can be identified.

  As a result of the determination drive performed in step S65, the control unit 11 determines that there is a difference between the load applied when the cutting tool 5 held in the head unit 2 is driven by normal driving and the load applied when driven by twist driving. Then, it is determined whether or not it is equal to or greater than a predetermined reference value (step S66).

  When the control unit 11 determines that the difference between the load applied when driving by normal driving and the load applied by driving by twist driving is greater than or equal to a predetermined reference value (step S66: YES), the head The cutting tool 5 held in the part 2 is driven by normal driving (step S67).

  On the other hand, when the control unit 11 determines that the difference between the load applied when driving by normal driving and the load applied by driving by twist driving is less than a predetermined reference value (step S66: NO). Then, the cutting tool 5 held on the head unit 2 is driven by twist drive (step S63).

  Here, in the flowchart shown in FIG. 6, it is clearly shown that the drive for determining the shape of the cutting tool 5 (determination drive) is performed in step S <b> 65, but the user who uses the root canal treatment device 100. Does not necessarily need to be aware of this step. That is, the user simply starts cutting the inner wall of the root canal of the tooth to be treated without being aware of step S65, and the root canal treating device 100 automatically performs the determination drive, and the head The shape of the cutting tool 5 held in the part 2 may be determined, and an appropriate drive that matches the shape of the cutting tool 5 may be selected.

  As described above, in the root canal treating device 100 according to the first embodiment of the present invention, the user can switch the normal drive and the twist drive based on the information obtained from the cutting tool 5, so that the user can It is possible to identify whether the held cutting tool 5 has a normal shape or a twist shape, and to select an appropriate drive that matches the shape of the cutting tool 5. Specifically, the information obtained from the cutting tool 5 includes identification information such as an identification tag or an identification shape, and drive information indicating a driving state of the cutting tool 5 such as a load applied to the cutting tool 5.

  The drive information obtained from the cutting tool 5 is the difference between the load applied when the cutting tool 5 held in the head unit 2 shown in FIG. 6 is driven by normal driving and the load applied when driven by twist driving. It is not limited to. Other driving information obtained from the cutting tool 5 includes, for example, a change in position when the cutting tool 5 is driven by normal driving to cut the cutting object, and a cutting object is driven by driving the cutting tool by twist driving. It may be a difference from a change in position when cutting. The position of the cutting tool 5 can be electrically measured by the root canal length measuring circuit 12.

  Here, when the cutting tool 5 held by the head unit 2 is driven by normal driving to cut the cutting object, the position change when the cutting tool 5 is driven by twist driving to cut the cutting object. The principle by which the shape of the held cutting tool 5 can be identified using the difference from the change in position will be described. The normal-shaped cutting tool 5 has a blade formed so as to cut the object to be cut during forward rotation and move forward in the cutting direction. Retreat with respect to the cutting direction. On the other hand, the twist-shaped cutting tool 5 is formed with a blade so that the object to be cut can be cut by alternately rotating forward and reverse, so that the twist-shaped cutting tool 5 is rotated forward compared to the normal-shaped cutting tool 5. The distance that moves forward with respect to the cutting direction is short, and the distance that moves backward with respect to the cutting direction during reverse rotation is also short.

  Therefore, when the shape of the cutting tool 5 held in the head part 2 is a normal shape, the position change when the cutting target is cut by driving with a normal drive, and the cutting tool 5 is driven with a twist drive to drive the cutting target. The difference from the change in position when cutting an object is larger than in the case of a twist shape. Therefore, a change in position when the cutting tool 5 held by the head unit 2 is driven by normal driving to cut the cutting object, and a position when the cutting tool 5 is driven by twist driving to cut the cutting object. The shape of the held cutting tool 5 can be identified by whether or not the difference from the change is equal to or greater than a predetermined reference value. The root canal treating device 100 can be similarly changed by changing the determination in step S66 shown in FIG. 6 to whether or not the difference in the change in the position of the cutting tool 5 is equal to or greater than a predetermined reference value. In addition, it is possible to select an appropriate drive suitable for the shape of the cutting tool 5.

(Embodiment 2)
In the root canal treating device 100 according to the first embodiment, before cutting the object to be cut, the shape of the cutting tool 5 held by the head unit 2 is identified, and driving is performed by appropriately switching between normal driving and twist driving. The configuration to be described has been described. On the other hand, in the root canal treating device according to the second embodiment, a configuration in which the cutting tool 5 is driven by appropriately switching between normal driving and twist driving while cutting the cutting object will be described.

  Since the root canal treating device according to Embodiment 2 uses the same configuration as root canal treating device 100 according to Embodiment 1 shown in FIGS. 1 to 3, detailed description will not be repeated using the same reference numerals.

  In the cutting tool 5, a highly flexible nickel / titanium alloy or the like is used in order to cut and expand a curved root canal. However, since the cutting tool 5 is damaged when an excessive load is applied, it is necessary to drive the cutting tool 5 so that an excessive load is not applied to the cutting tool 5. Therefore, the root canal treating device 100 according to the second embodiment has a configuration in which normal driving and twist driving are appropriately switched by a load applied to the cutting tool 5.

  FIG. 7 is a flowchart showing an example of switching of driving of the cutting tool 5 in the root canal treating device 100 according to the second embodiment. First, when the shape of the cutting tool 5 held in the head unit 2 is a normal shape, the root canal treating device 100 identifies the shape of the cutting tool 5 and switches to normal driving as shown in the first embodiment. Then, the cutting tool 5 is driven (step S71).

  The control unit 11 determines whether or not the load detected by the load detection resistor 13d is greater than or equal to the reference load (step S72). The reference load is, for example, the upper limit value of the load allowed by the cutting tool 5, and is set in advance using the variable resistance 14a for setting the reference load of the reference setting unit 14. The reference load is displayed as an element 60b on the display unit 16 shown in FIG.

  When it is determined that the load detected by the load detection resistor 13d is equal to or higher than the reference load (step S72: YES), the controller 11 switches the normal drive to the twist drive and drives the cutting tool 5 (step S73). Thereby, the root canal treating device 100 reduces the load applied to the cutting tool 5 and can prevent the cutting tool 5 from being damaged.

  On the other hand, when it is determined that the load detected by the load detection resistor 13d is less than the reference load (step S72: NO), the control unit 11 maintains the normal drive and drives the cutting tool 5 (step S74).

  In addition, the structure which switches appropriately a normal drive and a twist drive with the load added to the cutting tool 5 is not limited to the above-mentioned structure. For example, when the shape of the cutting tool 5 held in the head unit 2 is a twist shape, the root canal treating device 100 drives the cutting tool 5 by twist drive at the start of driving, but when the load falls below a certain value. The cutting tool 5 may be driven by switching from twist drive to normal drive. As a result, the root canal treating device 100 can efficiently cut the cutting object by switching to the normal driving when the cutting object cannot be sufficiently cut by the twist drive. Moreover, it is good also as a structure which sets multiple reference values. In that case, for example, when it is determined that the load applied to the cutting tool 5 is greater than or equal to the first reference value, the normal drive is switched to the twist drive, and when it is determined that the load is greater than or equal to the second reference value, only the reverse rotation from the twist drive is performed. Further switching to normal driving is possible.

  Next, since the root canal treatment device 100 needs to be carefully cut in the vicinity of the apex, the root canal treatment device 100 has a configuration in which normal driving and twist driving are appropriately switched depending on the position of the cutting tool 5.

  FIG. 8 is a flowchart showing another example of switching of driving of the cutting tool 5 in the root canal treating device 100 according to the second embodiment. First, when the shape of the cutting tool 5 held in the head unit 2 is a normal shape, the root canal treating device 100 identifies the shape of the cutting tool 5 and switches to normal driving as shown in the first embodiment. Then, the cutting tool 5 is driven (step S81).

  The controller 11 determines whether or not the position of the tip of the cutting tool 5 measured by the root canal length measurement circuit 12 has reached the reference position (step S82). The reference position is, for example, a position away from the apex position by a certain length, and is set in advance using the reference position setting variable resistor 14 c of the reference setting unit 14. Further, the reference position may be displayed on the dot display unit 52 in the display unit 16 shown in FIG.

  When it is determined that the position of the tip of the cutting tool 5 measured by the root canal length measurement circuit 12 has reached the reference position (step S82: YES), the control unit 11 switches the normal driving to the twist driving and changes the cutting tool 5 to the cutting tool 5. Drive (step S83). Thereby, the root canal treating device 100 can cut the vicinity of the apex more carefully.

  On the other hand, when it determines with the position of the front-end | tip of the cutting tool 5 measured with the root canal length measurement circuit 12 not reaching the reference position (step S82: NO), the control unit 11 maintains the normal drive and the cutting tool 5 is maintained. Is driven (step S84).

  In addition, the structure which switches appropriately a normal drive and a twist drive according to the position of the cutting tool 5 is not limited to the above-mentioned structure. For example, when the shape of the cutting tool 5 held by the head unit 2 is a twist shape, the root canal treating device 100 drives the cutting tool 5 by twist drive at the start of driving, but the position of the cutting tool 5 is present. When within the range, the cutting tool 5 may be driven by switching from the twist drive to the normal drive. As a result, the root canal treating device 100 can efficiently cut the cutting object by switching the range in which the cutting object cannot be sufficiently cut by the twist drive to the normal driving. Moreover, it is good also as a structure which sets two or more reference positions. In that case, for example, when it is determined that the tip of the cutting tool 5 has reached the first reference position, the normal drive is switched to the twist drive, and it is determined that the second reference position closer to the root apex is reached than the first reference position. In this case, it is possible to further switch from the twist drive to the normal drive with only reverse rotation.

  As described above, the root canal treating device 100 according to the second embodiment appropriately switches between the normal drive and the twist drive depending on the load applied to the cutting tool 5 and the position of the cutting tool 5, so that the cutting tool 5 is damaged. Can be prevented, and the root canal can be safely cut.

  In the root canal treatment device 100 according to the first and second embodiments, the configuration in which the handpiece 1 is coupled to the control box 9 via the hose 61 has been described, but the present invention is limited to this. It may be configured as a cordless type root canal treatment device. FIG. 9 is a schematic view showing the configuration of a cordless type root canal treatment device. The cordless type root canal treatment device shown in FIG. 9 has a control system corresponding to a battery pack, a micromotor, and a control box incorporated in the grasping portion 4 of the handpiece 1, and various operation portions are provided on the surface of the grasping portion 4. . Further, the cordless type root canal treatment device is provided with a display unit 16 in the grip unit 4. Therefore, the user can confirm whether the cutting tool 5 is driven by normal driving or twist driving without greatly changing the line of sight. Although not shown, the lead wire 19 for the oral electrode 19 a may be led out from the grip portion 4.

  In the root canal treatment device 100 according to the first and second embodiments, the case where the micromotor 7 is used as a power source for driving the cutting tool 5 has been described. However, the present invention is not limited to this, and the air Another drive source such as a turbine may be used.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Handpiece, 2 Head part, 3 Neck part, 4 Gripping part, 5 Cutting tool, 5a, 5b Identification tag, 6 Motor unit, 7 Micro motor, 8 Signal lead wire, 9 Control box, 10 Instrument, 10a Holder, 11 Control unit, 11a to 11d Port, 12 Root canal length measurement circuit, 13 Motor driver, 13a Transistor switch, 13b Transistor driver circuit, 13c Rotation direction changeover switch, 13d Load detection resistor, 14 Reference setting unit, 14a to 14c variable resistance, 15 operation unit, 16 display unit, 17 notification unit, 18 foot controller, 19 lead wire, 19a oral electrode, 20 main power source, 21 main switch, 52, 60 dot display unit, 54, 62 zone display unit, 56 boundary display section, 58 reach display section, 60 , 60b element 61 hose, 64 numerical display unit, 68 rotation display unit, 71 power supply leads, 100 root canal treatment instrument.

Claims (10)

A handpiece that holds the cutting tool in a drivable manner on the head part;
A power source for driving the cutting tool;
A first drive that drives the cutting tool in the forward direction when the rotational direction in which the cutting tool cuts the object to be cut is normal and the reverse rotational direction of the forward rotation is reverse; A drive unit that drives the cutting tool such that the second drive that repeatedly drives the forward rotation and the reverse rotation in a predetermined pattern can be switched; and
A dental treatment apparatus comprising: a control unit that switches between the first drive and the second drive in the drive unit based on information obtained from the cutting tool.   The dental treatment apparatus according to claim 1, further comprising a notification unit that notifies a user whether the control switched by the control unit is the control of the first drive or the second drive.   The information obtained from the cutting tool identifies drive information indicating a driving state of the cutting tool and whether the first cutting tool is suitable for the first drive or the second cutting tool is suitable for the second drive. The dental treatment device according to claim 1 or 2, wherein at least one of identification information for performing the operation is included. The cutting tool has an identification tag for identifying whether it is the first cutting tool or the second cutting tool, or an identification shape,
The control unit reads the identification information from the identification tag or the identification shape of the cutting tool, and drives the first drive or the second drive before driving the cutting tool based on the identification information. The dental treatment device according to claim 3, wherein the dental treatment device is switched to. A load detection unit for detecting a load applied to the cutting tool being driven;
The control unit uses the load detected by the load detection unit as the driving information, and the load of the cutting tool generated when the cutting tool is driven by the first drive to cut the cutting object; Based on a difference from the load of the cutting tool that is generated when the cutting tool is driven by the second drive to cut the object to be cut, the driving is switched to the driving by the first driving or the second driving. The dental treatment device according to claim 3.   The control unit according to claim 5, wherein the control unit switches control from the first drive to the second drive or from the second drive to the first drive when the load is equal to or higher than a predetermined reference load. Dental treatment device. A root canal length measuring unit for electrically measuring the position of the tip of the cutting tool in the root canal;
The control unit uses the position of the tip of the cutting tool measured by the root canal length measuring unit as the drive information, and drives the cutting tool by the first drive to cut the cutting object. Based on the difference between the change in position and the change in position when the cutting tool is driven by the second drive to cut the object to be cut, the drive in the first drive or the second drive is performed. The dental treatment device according to claim 3, wherein the dental treatment device is switched.   The control unit according to claim 7, wherein when the position reaches a predetermined reference position, the control unit switches control from the first drive to the second drive or from the second drive to the first drive. Dental treatment device.   The dental treatment apparatus according to claim 2, wherein the notification unit is a display unit and is provided on the handpiece.   The dental treatment apparatus according to claim 1, wherein the power source is an electric drive motor.

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