JPH0675577B2 - Dental treatment equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dental treatment apparatus, and in particular, prevents “potter drop” in which water droplets or the like drop from the tip of a dental treatment grip when the dental treatment work is stopped. Dental treatment device.

(Problems to be Solved by the Related Art and Invention) Conventionally, an air turbine handpiece at the end of dental treatment,
As a means for preventing water droplets from falling from the tip of a dental treatment gripping tool such as a triple syringe, that is, a “potter drop”, a dental treatment apparatus having a suction device in a pressurized water supply pipe system of the dental treatment instrument is known. Has been.

However, in a dental treatment apparatus including such a conventional suction device, saliva or the like of the patient is sucked into the dental treatment gripping tool at the end of the dental treatment, and the saliva or the like is transferred to the oral cavity of the subsequently examined patient. As a result, in some cases, there is a risk of causing a disease infection due to pathogenic bacteria, virus and the like.

(Means for Solving Problems) The present invention has been made in view of the above-mentioned points, and is a "potter" such as a liquid drop from the tip of the gripping tool 6 or 6'when the treatment work is completed by the gripping tool 6 or 6 '. It is a dental treatment device that prevents `` falling down '', that is, at least the compressed air supply line 3a,
In the dental treatment apparatus in which two conduits 3'a and the pressurized water supply conduits 5a, 5'a are connected to the dental treatment grippers 6, 6 ', in the middle of the pressurized water supply conduits 5a, 5'a A compressed air supply conduit 4a is connected to the gripping tool 6 for dental treatment,
When the dental treatment work by 6'is completed and at least the pressurized water supply lines 5a and 5'a are closed, the pressurized water supply line
A dental treatment apparatus characterized in that a pressurized air reverse injection control device is provided in the middle of 5a, 5'a so that the pressurized air from the pressurized air supply conduit 4a is reversely injected. is there.

In the present invention, the pressurized water supply line 5a of the dental treatment device,
Since the pressurized air supply conduit 4a is connected in the middle of 5'a, the pressurized air supply conduit 5a, 5'a is closed when the dental treatment work by the gripping tool is completed, etc. Pipeline 4a
The compressed air is reversely jetted from the pressurized water supply pipes 5a, 5'a to the water jet nozzle at the tip of the gripping tool, and the water in the pipeline is removed. As a result, there is no residual water near the tip of the gripping tool. Lost. Therefore, “dropping” of water droplets from the tip of the gripping tool does not occur, and since it is not a suction type like the conventional device, the saliva etc. of the patient is sucked and adsorbed by the water jet nozzle part at the tip of the gripping tool or the water drop. Problem does not occur.

Further, generally, for example, when the driving of the air turbine handpiece as the gripping tool is suddenly stopped and the compressed air supply conduit 3a is rapidly closed, a negative pressure is generated in the air turbine head due to inertial rotation of the air turbine rotor blade. Therefore, a phenomenon occurs in which saliva, pathogenic bacteria and the like in the patient's mouth are sucked into the air turbine head, but in a preferred embodiment of the present invention, at that time, low pressure air is discharged from the exhaust air discharge conduit 6a to the handpiece. This is prevented by being configured to feed back to the head and supply.

Further, the pressurized air reverse injection control device is configured so that the pressurized water supply line 5a
The compressed air supply line 3a may be closed in synchronization with the closing of the above.

Furthermore, the compressed air supply line 3a is provided in the grip for dental treatment.
In addition to the pressurized water supply pipeline 5a, the exhaust air discharge pipeline 6a may be further connected.

In such a case, the prevention of "pottering" is effectively achieved in conjunction with the end of the dental treatment work by the gripping tool.

(Operation) In the device of the present invention, at least the compressed air supply pipe lines 3a, 3 '
In the dental treatment apparatus in which two conduits a and the pressurized water supply conduits 5a, 5'a are connected to the dental treatment grippers 6, 6 ', the pressurized water supply near the dental treatment grippers 6, 6' Pipeline 5
A compressed air supply pipe line 4a is provided in the middle of a and 5'a, and when the dental treatment work by the gripping tool is completed and at least the pressurized water supply pipe lines 5a and 5'a are closed, A pressurized water supply line 5a near the dental treatment grippers 6, 6 ',
At the end of the dental treatment work by the gripping tool, a compressed air reverse injection control device is provided in the middle of 5'a so that the compressed air from the compressed air supply pipeline 4a is reversely injected. When the pressurized water supply pipelines 5a, 5'a are closed, the pressurized air is reversely jetted from the pressurized air supply pipeline 4a to the pressurized water supply pipelines 5a, 5'a, and the water jet nozzle at the tip of the gripping tool. As a result of the elimination of residual water in the conduit from the section, there is no water near the gripper tip.

Therefore, "pottering" from the tip of the gripping tool does not occur, and there is no problem that the saliva of the patient is adsorbed to the water jet nozzle section or the water droplets at the tip of the gripping tool.

Further, if the compressed air reverse injection control device is also designed to close the compressed air supply pipe 3a in synchronization with the closing of the pressurized water supply pipe 5a, the "potato Fall prevention is effectively achieved.

Furthermore, for example, when the drive of the air turbine handpiece is suddenly stopped and the compressed air supply line 3a is suddenly closed,
If the low pressure air is supplied from the exhaust air discharge conduit 6a to the tip of the gripping tool, negative pressure is prevented from being generated in the air turbine head.

(Examples) Some examples of the present invention will be described below with reference to the drawings.

1 to 6 are operations of pressurized air and pressurized water at the end of tooth cutting work and at the time of cutting work by a dental air turbine handpiece having a pressurized air reverse injection control device of Examples 1 to 3. FIG. 7 to FIG. 12 are circuit diagrams showing the state, and FIG. 7 to FIG. 12 show pressurized air at the end of work such as tooth washing and drying by a triple syringe having the pressurized air reverse injection control device of Embodiments 4 to 6 and at the time of the same work. FIG. 3 is a circuit diagram showing an operating state of pressurized water.

Embodiment 1 In FIG. 1, reference numeral 6 is an air turbine handpiece which is one of gripping tools, to which a compressed air supply pipe line 3a for introducing compressed air for driving is coupled, and further driven. An exhaust air discharge pipe line 6a for discharging exhaust air that is discharged from the air turbine later is connected.

In the compressed air supply pipeline 1a and the compressed air supply pipeline 3a that connect the compressed air supply source 1 and the air turbine handpiece 6, first, the compressed air supply pipeline 1a is branched from the pipelines 1b and 1c. Then
Subsequently, a switching valve 3 with a throttle valve, which is a 4-port valve with an atmosphere opening port, which constantly supplies low-pressure pressurized air decompressed by the throttle valve, is provided between the pipeline 1a and the pipeline 3a. The throttle valve-equipped switching valve 3 is connected to a pressurized air supply line by turning on and off the control pressurized air input from the petal-type control main valve 2.
1a to the pressurized air supply line 3a, and exhaust air discharge line 6a
Is to be opened to the atmosphere.

An exhaust air discharge conduit 6a and a compressed air supply conduit 3a are connected in parallel on the output side of the throttle valve-equipped switching valve 3.

Further, a main valve 2 for petal control, which is a normally closed 3-port valve with an atmosphere opening port, is connected to the pipeline 1b, and a pipeline 2b and a pipeline 2c are connected to the pipeline 2a at the end. Is provided and connected to the pilot ports of the switching valve with throttle valve 3, the reverse injection switching valve 4 and the on / off valve 5 for supplying pressurized water.

Furthermore, a pressurized water supply source 7, a pressurized water supply pipeline 7a, a normally closed two-port valve, a pressurized water supply switching valve 5, and a pressurized water supply pipeline 5a are connected in this order, and finally, the above-mentioned 6 air turbine handpieces are connected. Connected to the end.

Further, the pipe line 1c, the normally open two-port valve reverse injection switching valve 4, the throttle valve 8 ', and the pressurized air supply pipe line 4a are sequentially connected, and the end of the pipe line 1c is pressurized air. The end of the pressurized air supply pipeline 4a is connected to the supply source 1 in the middle of the pressurized water supply pipeline 5a.

As shown in FIG. 2, when the petal-type control main 2 is pressed for tooth cutting work, the control injection pressurized air derived from the valve 2 closes the reverse injection switching valve 4,
Pressurized air from the conduit 1c is not supplied to the pressurized water supply conduit 5a.

Further, the switching valve with throttle valve 3 is the main valve 2 for petal type control.
From the compressed air supply pipeline 1a to the compressed air supply pipeline 3a.
Further, the exhaust air discharge conduit 6a is switched to the atmosphere opening port.

As a result, compressed air is injected into the air turbine handpiece 6, and the air after injection is discharged from the atmosphere opening port of the valve 3 via the exhaust air discharge pipe line 6a. Then, the pressurized water supply switching valve 5 becomes conductive by the pressurized pressurized air for control input from the petal-type control main valve 2 via the conduit 2b, and the pressurized water is discharged from the air turbine handpiece 6.

After the tooth cutting work is completed, when the pressing of the petal-type control main valve 2 is released, as shown in FIG. 1, the pipe lines 2a, 2b,
Pressurized control air in 2c is discharged from the atmosphere opening port of the petal-type control main valve 2 and the throttle valve-equipped switching valve 3, the pressurized water supply switching valve 5 and the reverse injection switching valve 4 are returned to the old positions. Let

As a result, the switching valve 5 for supplying pressurized water is closed to stop the supply of pressurized water.

Further, the reverse injection switching valve 4 is turned on to make the pressurized water supply pipe line.
Low-pressure pressurized air is supplied in the middle of 5a to discharge and eliminate water remaining in the pipe 5a from the tip of the air turbine handpiece 6.

Further, the switching valve 3 with the throttle valve is restored so that the pressurized air supply pipeline 1a is switched to the exhaust air discharge pipeline 6a and the compressed air supply pipeline 3a is switched to the closed state, and the pressure is reduced by the throttle valve. The low-pressure pressurized air is sent back to the air turbine and is discharged outside from the pores of the head part, so that the inside of the head part is always positive pressure, so that "suction and adsorption of saliva etc." of the patient is prevented. .

Embodiment: 2 Another embodiment of the device will be described below with reference to FIGS. 3 and 4.

The device of this example has the basic configuration of the circuit (FIG. 1) of the first embodiment. In FIG. 3, a reverse injection switching auxiliary valve 4 ', an air tank 9, a throttle valve 8', and a reverse injection switching valve 4 are provided between the pressurized air supply source 1 and the conduit 5a on the output side of the switching valve 5 for supplying pressurized water. Main valve for petal control 2
Pipe lines 2c 'and 2c on the output side are connected to the reverse injection switching auxiliary valve 4'and the auxiliary valve of the reverse injection switching valve 4, respectively.

As shown in FIG. 4, when the petal-type control main valve 2 is pressed for the tooth cutting operation, the control pressurized air is input to the pipe lines 2a, 2b, 2c ', 2c and the normally closed reverse injection is performed. The switching auxiliary valve 4'and the normally-open type reverse injection switching valve 4 are made conductive and closed, respectively, and the compressed air inputted through the line 1c, the reverse injection switching auxiliary valve 4'and the line 4'a is an air tank. It is stored in 9.

When the pressing of the petal-type control main valve 2 is released at the end of the tooth cutting work, as shown in FIG. 3, the pipe lines 2a, 2b, 2'c,
Pressurized control air in 2c is discharged from the atmosphere opening port of the valve 2 to restore the reverse injection switching auxiliary valve 4'and the reverse injection switching valve 4.

As a result, the reverse injection switching valve 4 and the reverse injection switching auxiliary valve 4 '
Are brought into conduction and blockage, respectively, and the pressurized air in the air tank 9 is gradually supplied to the pipe line 5a for a certain time while being pressurized by the throttle valve 8 ', and the water remaining in the pipe line 5a is evacuated. It is discharged from the turbine handpiece 6.

Further, as in the case of the first embodiment, since the low-pressure pressurized air sourced by the throttle valve-equipped switching valve 3 with a forward / reverse reversal function is supplied to the air turbine handpiece 6, the inside of the air turbine head is positively pressurized. It is retained and “suction and adsorption of saliva etc.” is prevented.

Example: 3 The apparatus of this example will be described below with reference to FIGS. 5 and 6.

The apparatus of this example also has the basic configuration of the circuit of Example 1 (FIG. 1). In Fig. 5, a normally closed type reverse injection switching auxiliary valve 4'and a normally open type reverse injection switching valve 4 are sequentially connected between the pressurized air supply source 1 and the pressurized water supply line 5a, and the petal position is set. The main passage 2c 'on the output side of the control main valve 2 is used as a sub valve of the reverse injection switching auxiliary valve 4'through a time-limit return circuit including a check valve (speed control valve) 8 with a throttle valve and an air tank 9. ,
Further, the output side pipe lines 2c are respectively connected to the sub valves of the reverse injection switching valve 4.

As shown in FIG. 6, when the petal-type control main valve 2 is pressed for the tooth cutting operation, the pipe lines 1a, 2a,
The compressed air for control input from 2c ′ and 2c is
c ', the normally closed reverse injection switching auxiliary valve 4'is pressed through the time-returning time limit circuit composed of the speed control valve 8 and the air tank 9 to bring the valve 4'in the conducting state and at the same time into the air tank 9. Store compressed air.

Further, the pressurized control air presses the reverse injection switching valve 4 through the conduit 2c to close it.

When the pressing of the control main valve 2 is released after the tooth cutting work is completed, the control pressurized air in the conduits 2a, 2b, 2c is released from the atmosphere opening port of the valve 2 as shown in FIG. The reverse injection switching valve 4 becomes conductive.

Then, the compressed air in the air tank 9 which has pressed the sub valve of the reverse injection switching auxiliary valve 4 ', the throttle valve 8'of the time delay reset circuit 8,
It is gradually released from the atmosphere opening port of the valve 2 through the pipe lines 2c ', 2c, 2a, and keeps the reverse injection switching auxiliary valve 4'in a conductive state for a certain time.

As a result, the pressurized air is injected into the pressurized water supply pipeline 5a via the pipelines 1a, 1c, 4'a, 4a, and the water remaining in the pipeline 5a is discharged from the air turbine handpiece 6 to the outside. release,
Exclude.

Further, since the low pressure compressed air is constantly supplied to the air turbine handpiece 6 as in the first and second embodiments,
"Suction and adsorption of saliva etc." is prevented.

Example: 4 The device of this example is a triple syringe having the circuit shown in FIGS. 7 and 8.

In FIG. 7, the pressurized air supply line 1a connecting the pressurized air supply source 1 and the triple syringe 6'is first provided with a line.
1b and 1c are branched, and then a changeover valve 3'with a push-button type throttle valve consisting of a 2-port valve is connected.

Further, a normally closed two-port pushbutton type pressurized water supply switching valve 5 is connected between the conduits 7a and 5'a from the pressurized water supply source 7 to the base end of the triple syringe 6 '. .

A normally-closed three-port valve with an atmosphere opening port, which is a push-button control main valve 2 ', is connected to the pipeline 1b, and a pipeline 2'c ahead of the push-button control main valve 2'is connected to the auxiliary injection valve 4a. The valve is connected.

In the device of this embodiment, a reverse injection switching valve 4 which is a normally open two-port valve which is closed by pressurized air for control input from the main valve 2'and a throttle valve 8'are connected in sequence, and The line 1c is connected to them via the line 4a in the middle of the pressurized water supply line 5'a. The push-button type control main valve 2'and the push-button type pressurized water supply switching valve 5'have a circuit structure in which pressing operations are synchronized.

In FIG. 8, when the push-button type switching valve with throttle valve 3'is pressed for the purpose of treatment work, compressed air is ejected from the triple syringe 6'through the conduits 1a and 3'a.

Further, when the push button type pressurized water supply switching valve 5'and the push button type control main valve 2'is pressed synchronously, the reverse injection switching valve 4 is pressed by the control pressurized air input via the conduit 2'c. Then, the closed state is established, and at the same time, the push button type pressurized water supply switching valve 5 is brought into a conductive state and pressurized water is supplied to the triple syringe 6 '.
Is jetted from.

As shown in FIG. 7, when the pushbutton type switching valve 3'with a throttle valve 3'is released and returned to the old position after the completion of the treatment work such as cleaning, the pressurized air constantly depressurized by the throttle valve 3 It is supplied to the triple syringe 6'through'a and constantly positive pressure is applied to the inside of the head to prevent "suction and adsorption of saliva etc.".

When the push button type control main valve 2'and the pressurized water supply switching valve 5'are released, the valves 2'and 5'are closed and the supply of water to the triple syringe 6'is stopped.

As a result, the pressurized control air in the pipe line 2'c on the side of the reverse injection switching valve 4 is released from the atmosphere opening port of the push button type control main valve 2 ', and the reverse injection switching valve 4 becomes conductive. The pressurized air decompressed by the throttle valve 8'is supplied to the pipe line 5'a, and the water remaining in the pipe line 5'a is discharged from the triple syringe 6 '.

Example: 5 The apparatus of this example will be described below with reference to FIGS. 9 and 10.

In this device, as shown in FIG. 9, a reverse injection switching auxiliary valve 4 ', an air tank 9, a throttle valve 8'and a reverse injection switching valve 4 are provided in order between the pressurized air supply source 1 and the pressurized water supply line 5'a. The reverse injection switching auxiliary valve 4'and the auxiliary valve of the reverse injection switching valve 4 are connected and the auxiliary valve 2'of the push button type control main valve 2'is connected.
c'and the conduit 2'c, respectively.

When the push-button type control main valve 2'and the push-button type cleaning on-off valve 12 are pressed for the purpose of treatment work, as shown in FIG. 10, the pressurized control air is supplied to the pipelines 1a, 1b, 2'c '. 2'c, the normally closed type reverse injection switching auxiliary valve 4'is pressed to bring it into conduction, and the normally open type reverse injection switching valve 4 is pressed to make it closed.

Then, the compressed air is stored in the air tank 9 through the pipelines 1a, 1c, 4 ', 4'a. After the completion of treatment work such as cleaning, when the push button type control main valve 2'and the push button type pressurized water supply switching valve 5'are released, the pipe line 2'is as shown in FIG.
Pressurized control air in the valves c and 2'c 'is discharged from the atmosphere opening port of the valve 2', and the reverse injection switching valve 4 and the reverse injection switching auxiliary valve 4'are returned to the conductive and closed states, respectively. Become.

As a result, the compressed air in the air tank 9 is gradually decompressed by the throttle valve 8'and is supplied to the pressurized water supply pipe 5'a for a certain time, and the water remaining in the pipe 5'a is triple syringe. Discharge from the tip.

Further, similarly to the fourth embodiment, the push-button type switching valve with throttle valve 3 '
When the pressure is released, the low-pressure air decompressed by the throttle valve is supplied to the triple syringe 6 ', and the head is always kept at positive pressure to prevent "suction and adsorption of saliva etc.".

Example: 6 The apparatus of this example will be described below with reference to FIGS. 11 and 12.

In the apparatus of this example in FIG. 11, the normally closed reverse injection switching auxiliary valve 4'and the normally open reverse injection are provided between the pressurized air supply source 1 and the conduit 5a on the output side of the pressurized water supply switching valve 5. The switching valves 4 are connected in order, and the conduit 2'c 'on the output side of the push button type control main valve 2'is provided with a time-return circuit composed of a check valve (speed control valve) 8 with a throttle valve and an air tank 9. Is connected to the sub valve of the reverse injection switching auxiliary valve 4'and the pipe line 2'c is connected to the sub valve of the reverse injection switching valve 4.

As shown in FIG. 12, when the push button type control main valve 2'is pressed for the purpose of treatment work, the control pressurized air input through the conduit 2'c presses the reverse injection switching valve 4. To close it, and press the normally closed type reverse injection switching auxiliary valve 4'to conduct it through the time-returning circuit consisting of the speed control valve 8 and the air tank 9 from the pipelines 1a, 1b, 2'c '. .

Then, the pressurized air for control is stored in the air tank 9.

After the completion of the treatment work such as washing, as shown in FIG. 11, when the push on the push button type control main valve 2'is released, the conduit 2 '
Pressurized control air in c, 2'c 'is discharged from the atmosphere opening port of the piece 2', and the reverse injection switching valve 4 is made conductive. Also,
Pressurized control air in the air tank 9 is gradually discharged from the throttle valve 8'through the conduits 2'c 'and 2'c and from the atmosphere opening port of the valve 2', and the reverse injection switching auxiliary valve 4'is kept constant. Press for a period of time to maintain a conductive state.

As a result, the pressurized air is injected into the conduit 5'a for a certain period of time through the conduits 1a and 1c, the reverse injection switching auxiliary valve 4'and the reverse injection switching valve 4, and remains in the conduit 5'a. The water to be ejected is ejected from the tip of the triple syringe 6 '.

Further, when the push button type throttle valve-equipped switching valve 3'is released as in the case of the above embodiment, the low-pressure pressurized air decompressed by the throttle valve is constantly supplied to the triple syringe 6 ', so that "saliva, etc." Suction and adsorption "are prevented.

(Effects of the Invention) As described in detail in the above embodiments and the like, in the present invention, since the pressurized air supply pipeline is connected in the middle of the pressurized water supply pipeline of the dental treatment apparatus, it is possible to use the air turbine handpiece or the like. When the pressurized water supply line is closed, such as when the dental treatment work with the gripping tool is completed, pressurized air is back-injected from the pressurized air supply line to the pressurized water supply line, and from the water injection nozzle section at the tip of the gripping tool. As a result of the elimination of water in the conduit, there is no residual water near the tip of the gripper. Therefore, “dropping” of water droplets from the tip of the gripping tool does not occur, and since it is not a suction type like the conventional device, the saliva etc. of the patient is sucked and adsorbed by the water jet nozzle part at the tip of the gripping tool or the water drop. Problem does not occur.

Further, when the circuit configuration is such that low-pressure pressurized air is sent back from the exhaust air discharge conduit to the handpiece head at the end of the treatment work by the dental gripping tool, for example, in the case of an air turbine handpiece as a gripping tool. Negative pressure does not occur in the turbine head even when the drive is suddenly stopped and the compressed air supply line is suddenly closed, so there is a risk that spattered saliva and pathogenic bacteria in the patient's mouth will be sucked into the air turbine head. Does not occur.

Also, the pressurized air reverse injection control device is installed in the pressurized water supply line.
If the compressed air supply line 3a is also closed in synchronization with the closing of 5a, the prevention of "pottering" can be effectively achieved in conjunction with the end of the dental treatment work by the gripping tool.

[Brief description of drawings]

1 to 6 show the operating states of pressurized air and pressurized water at the end of tooth cutting work and at the time of cutting work by a dental air turbine handpiece having a pressurized air reverse injection control device of Examples 1 to 3. The circuit diagram shown in FIGS. 7 to 12 is the fourth embodiment.
FIG. 6 is a circuit diagram showing an operating state of pressurized air and pressurized water at the end of work such as tooth cleaning and drying by a triple syringe having the pressurized air reverse injection control device of 6 and at the same time. 1: pressurized air supply source, 2 and 2 ': main valve for control, 3 and 3': switching valve with throttle valve, 4: reverse injection switching valve, 4 ': reverse injection switching auxiliary valve, 5 and 5': Pressurized water supply switching valve, 6, 6 ': gripper for dental treatment, 7: pressurized water supply source, 8: speed control valve, 8': throttle valve, 9: air tank, 6 ': triple syringe, 3a, 3' a: Compressed air supply line, 4a: Pressurized air supply line, 5a, 5'a: Pressurized water supply line, 6a: Exhaust air discharge line

Claims (6)

[Claims] 1. A dental treatment apparatus in which at least two compressed air supply lines 3a, 3'a and pressurized water supply lines 5a, 5'a are connected to dental treatment grippers 6, 6 '. In the above, the pressurized air supply conduits 5a, 5'a are connected to the pressurized air supply conduit 4a, and further, the dental treatment work by the dental treatment grippers 6, 6'is completed, and at least the pressurized water supply conduit Road 5a,
Pressurized water supply lines 5a, 5'a when 5'a is closed
A dental treatment apparatus characterized in that a compressed air reverse injection control device is provided in the middle of which the compressed air from the compressed air supply pipe line 4a is reversely injected. 2. A dental treatment gripper 6 from a pressurized water supply source 7,
In the middle of the pressurized water supply pipelines 5a and 5'a leading to 6 ', a pressurized water supply switching valve 5 consisting of a normally closed 2-port valve interlocked with the operation of the control main valves 2, 2'is provided. The dental treatment device according to claim 1. 3. A compressed air reverse injection control device is provided with a reverse injection switching valve 4 provided in the middle of a compressed air supply conduits 1c, 4a led from a compressed air supply source 1, and a control main valve 2. 2 ',
The dental injection according to claim 1 or 2, further comprising: a pilot pipe 2c, 2'c for controlling the reverse injection switching valve, which is derived from the main valve 2, 2 '. Treatment device. 4. A pressurized air reverse injection control device comprises a normally closed reverse injection switching auxiliary valve 4 ', an air tank 9 and a throttle valve 8'between the pressurized air supply source 1 and the reverse injection switching valve 4. The dental treatment device according to any one of claims 1 to 3, characterized in that the dental treatment device is connected to the. 5. A reverse injection auxiliary switching valve 4'provided between a compressed air supply source 1 and a reverse injection switching valve 4 by a compressed air reverse injection control device.
And a throttle valve with a check valve (speed control valve) 8 and an air tank 9 are connected between the output side of the control main valves 2, 2'and the pilot of the reverse injection switching auxiliary valve 4 '. The dental treatment apparatus according to any one of claims 1 to 4, further comprising a pilot control pipe. 6. The compressed air reverse injection control device closes the compressed air supply conduit 3a in synchronism with the closing of the pressurized water supply conduit 5a. The dental treatment device according to any one of item 5.