JP6788242B2 - Handpiece cleaning and disinfecting device - Google Patents

Description

The present invention relates to a handpiece cleaning and disinfecting device used in dentistry.

In dental treatment, a treatment instrument called a handpiece for cutting teeth is used. This handpiece is equipped with a cutting blade that is rotationally driven at high speed by an air turbine, and during treatment, blood adheres to the cutting blade and saliva adheres to the head and handle. Therefore, when the treatment of one patient is completed and the next patient is treated, it is necessary to wash the blood and saliva adhering to the handpiece in advance and sterilize them.

The autoclave sterilization method is widely used for cleaning and disinfecting these handpieces. That is, after the dental treatment is completed, the oil for maintenance is injected into the handpiece, and then the oil is stored in the device and sterilized in a high temperature and high pressure environment for a predetermined time.

However, the autoclave is extremely expensive, the operation such as oil injection is complicated, and it takes a long time for sterilization. In addition, there is a problem that the portion to which the blood clot or the like is attached is not sterilized, and further, it causes deterioration of the handpiece, so that there are many problems in practice. Further, in the autoclave, there is a problem that the injected oil elutes because the environment is filled with high temperature steam at high pressure.

Therefore, there are various washing and sterilizing devices that can replace the autoclave, and for example, those disclosed in Patent Documents 1 to 3 are known.

Patent Document 1 (Japanese Unexamined Patent Publication No. 7-67893) is configured so that the handpiece can be stored in a closed container that can accommodate the handpiece and decompressed so that the disinfectant can be supplied and discharged for a short time. Discloses a device capable of simultaneously sterilizing the outside and the capillary section.

Further, Patent Document 2 (Japanese Unexamined Patent Publication No. 2005-65991) describes an apparatus provided with a cleaning tank capable of evacuating the inside and performing ultrasonic cleaning in a state where the cleaning liquid is stored.

Further, Patent Document 3 (Japanese Unexamined Patent Publication No. 2003-2000174) describes a device provided with a cartridge connected to a handpiece and disinfected by injecting a cleaning solution containing a chlorine-based compound or hydrochloric acid from the cartridge. ..

Japanese Unexamined Patent Publication No. 7-67893 JP-A-2005-65991 Japanese Unexamined Patent Publication No. 2003-200174

However, in the devices of each of the above patent documents, it is necessary to inject oil after washing and sterilization, and the sterilized state is released during this operation. On the other hand, if cleaning is performed after injecting oil, the oil will flow out and the handpiece will be poorly maintained, and the handpiece before sterilization will be set in the oil injector, which may cause bacterial growth in the lubricator. was there.

In addition, the pressure is reduced to make it easier to inject the cleaning sterilizing solution into the inside of the handpiece, but in this state, the cleaning sterilizing solution simply enters the inside, and the dirt inside is sufficiently cleaned and removed. It was difficult to do.

Further, since the cleaning sterilizing solution is injected into the inside of the handpiece in each case, it is necessary to remove the cleaning solution from the inside after use, and there is a problem that the sterilized state is released during this operation.

Therefore, the technical problem to be solved by the present invention is handpiece cleaning which can surely remove various stains, maintain a sterilized state, and can appropriately lubricate oil. To provide a sterilizer.

The present invention provides a handpiece cleaning and sterilizing apparatus having the following configuration in order to solve the above technical problems.

According to the first aspect of the present invention, a casing that can be sealed by opening and closing the lid member, an ultrasonic cleaning tank that is provided in the casing and can store the cleaning liquid, and an ultrasonic cleaning tank that can store the cleaning liquid.
A gas filling member that fills the casing with sterilizing gas,
An oil tank for storing oil for maintenance of the handpiece and
A nozzle unit having a nozzle having an opening at the tip and having a flow path capable of sending a fluid into the handpiece mounted on the tip, and a nozzle unit.
A nozzle operating portion provided above the ultrasonic cleaning tank, which supports the nozzle and moves the nozzle up and down so that the handpiece attached to the nozzle can be taken in and out of the ultrasonic cleaning tank,
Wherein the cleaning liquid, wherein the sterilizing gas filled in the casing by the gas-filled member, to flow the flow paths the fluid by switching at a predetermined timing and a oil in the oil tank, ejected from the nozzle tip Equipped with a fluid control device
Wherein the nozzle actuating unit, the sterilizing gas, the timing of flowing the oil, characterized Rukoto moving the handpiece to the outside of the cleaning liquid of the ultrasonic cleaning tank, providing a handpiece cleaning and sterilizing apparatus.

According to the second aspect of the present invention, the sterilizing gas is ozone gas.
The gas filling member provides the handpiece cleaning and sterilizing apparatus of the first aspect, characterized in that it is an ozone generating lamp provided in the casing.

According to a third aspect of the present invention, the casing includes an ozone gas decomposer that decomposes the ozone gas and an exhaust gas means that sends the ozone gas stored inside to the ozone gas decomposer. The second aspect of the handpiece cleaning and sterilizing apparatus is provided.

According to the fourth aspect of the present invention, the nozzle actuating portion has a rod-like shape rotatably configured around a rotation axis extending horizontally along the peripheral edge of the ultrasonic cleaning tank.
The first feature is that the fluid control device operates so as to immerse the handpiece mounted on the nozzle in the cleaning liquid in the ultrasonic cleaning tank at the timing of flowing the cleaning liquid into the flow path . To provide a handpiece cleaning and sterilizing apparatus according to any one of the third aspects.

According to the fifth aspect of the present invention, the flow path includes a supply pipe for flowing the cleaning liquid, the sterilizing gas, and the oil, respectively, and the supply pipe is switched by a pipe switching valve to nozzle the cleaning liquid, ozone, and oil, respectively. Provided is a handpiece cleaning and sterilizing apparatus according to any one of the first to fourth aspects, which is configured to discharge from a tip .

According to the sixth aspect of the present invention, the fluid control device removes residual oil by flowing the cleaning liquid, the sterilizing gas, and oil in order in the flow path, and then flowing the sterilizing gas again. Provided is a handpiece washing and sterilizing apparatus according to any one of the first to fifth aspects .

According to the seventh aspect of the present invention, there is provided a handpiece washing and sterilizing apparatus according to any one of the first to sixth aspects, wherein the washing liquid is a protein lysate having a pH of 12 or higher .

According to the eighth aspect of the present invention, there is provided the handpiece washing and sterilizing apparatus according to any one of the first to seventh aspects, wherein the washing liquid is electrolytically functional water having a pH of 12 or higher .

According to the present invention, dirt such as proteins and blood clots attached to the surface of the handpiece can be removed by immersing in the cleaning liquid, and the cleaning liquid and sterilizing gas are discharged from the tip of a common nozzle. , Internal cleaning and sterilization is possible. Moreover, since oil is discharged from the same nozzle, it is possible to lubricate in a sterilized state. Further, since these operations are performed in a sealed casing, the sterilized state is maintained even after the operations.

According to the second aspect of the present invention, by using ozone gas as the sterilizing gas, the casing can be filled relatively easily, and a sufficient degree of bactericidal effect can be ensured. Further, after the operation of the apparatus, in order to process the ozone gas, the ozone gas can be decomposed by passing the ozone gas through the ozone gas decomposer by the exhaust gas means.

According to the fourth aspect of the present invention, the handpiece can be easily taken in and out by rotating around a rotation axis extending horizontally along the peripheral edge of the ultrasonic cleaning tank, and a plurality of nozzles are provided. In some cases, the same operation can be performed at the same time.

According to the fifth aspect of the present invention, the outside and the inside of the handpiece can be cleaned at the same time by immersing the cleaning liquid in the cleaning liquid in the ultrasonic cleaning tank at the timing of flowing the flow path, and the cleaning liquid is sucked by the sackback. It is possible to effectively sterilize the inside of the handpiece.

According to the sixth aspect of the present invention, since the cleaning liquid is discharged at the timing of sending the sterilizing gas or oil, the fluid can be sufficiently sent to the inside of the handpiece, and the effects of ozone sterilization and lubrication can be improved. it can.

According to the seventh aspect of the present invention, it is possible to switch and discharge three types of fluids from a common nozzle, and it is possible to save time and effort such as replacement of a handpiece.

According to the eighth aspect of the present invention, the cleaning liquid, the sterilizing gas, and the oil are flowed in order in the flow path, and the oil is lubricated after the cleaning and sterilization so that the oil does not flow out during the cleaning. In addition, since the liquid and gas are switched and discharged, the residual liquid can be removed by flowing the sterilized gas after the liquid is discharged, and a sufficient cleaning step and lubrication step are performed while maintaining the sterilized state. Can be carried out.

According to the 9th and 10th aspects of the present invention, since it is harmless and exhibits a bactericidal action while dissolving the protein without coagulating the protein, it is suitably used as a useful bactericidal agent for washing and sterilizing handpieces. be able to.

It is a figure which shows the appearance structure of the handpiece washing and sterilizing apparatus which concerns on embodiment of this invention. It is a schematic diagram which shows the internal structure of the handpiece washing and sterilizing apparatus of FIG. It is a figure which shows the structural example of the opening part of a nozzle. It is a figure which shows the structure of the flow path of the handpiece washing sterilizer. It is a figure which shows the operation flow of the handpiece washing and sterilizing apparatus which concerns on this embodiment.

Hereinafter, the handpiece washing and sterilizing apparatus according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an external configuration of a handpiece washing and sterilizing device according to an embodiment of the present invention. FIG. 2 is a diagram showing an internal configuration of the handpiece cleaning and sterilizing device of FIG.

The handpiece cleaning and sterilizing device 1 according to the present embodiment includes a casing 2 having an opening 4 on the front surface 3, and various members for cleaning and sterilizing the handpiece 100 are arranged in the storage space 5 of the casing 2. There is.

Various switches 7 are provided in the lower part of the front surface 3 of the casing 2 to start fully automatic operation of the handpiece cleaning and sterilizing device 1 according to the present embodiment, perform manual operation, and the like.

The opening 4 of the casing 2 can be sealed by the lid member 6. As shown by the arrow 90, the lid member 6 is configured to be able to open and close the opening by rotating around the upper side of the opening 4.

As shown in FIG. 2, the storage space 5 in the casing is divided into an operation area 5a and a circuit area 5b by a partition wall 11 so that a cleaning liquid or the like used for cleaning does not leak into the circuit area 5b. It has become.

The operation area 5a is provided with an ultrasonic cleaning unit 8, a plurality of nozzle units 9 to which the handpiece 100 can be mounted, and an ozone generation lamp 10.

The ultrasonic cleaning unit 8 includes an ultrasonic cleaning tank 12 and an oscillation base 13 that generates ultrasonic vibrations in the ultrasonic cleaning tank 12. As will be described later, the ultrasonic cleaning tank 12 uses electrolytically functional water, which is a protein dissolving solution, as a cleaning solution, and performs ultrasonic vibration to clean the handpiece 100 immersed in the cleaning solution. Since protein stains such as blood clots are attached to the surface of the handpiece, these can be removed by performing the ultrasonic cleaning.

The nozzle unit 9 includes a nozzle 14 to which the handpiece 100 can be mounted, and a nozzle operating portion 15 for moving the handpiece mounted on the nozzle 14 so as to be taken in and out of the ultrasonic cleaning tank 12. As shown in FIG. 3, the nozzle 14 is provided with two sets of openings (discharge ports) 16a and 16b that can communicate with the internal mechanism inside the handpiece 100 when the handpiece 100 is mounted. For example, an air turbine type hand. Connect with the air supply pipe inside the piece.

In addition to the air turbine type handpiece, the nozzle 14 can also be mounted with a contra-angle type, and is configured so that the shape of the opening differs depending on the type and structure of the handpiece to be sterilized. .. For example, depending on the structure of the handpiece, an attachment to be connected to the handpiece may be provided. Further, of the paired openings, one opening discharges a fluid and the other opening sucks a fluid.

The nozzle operating portion 15 is a cylindrical member horizontally arranged above the ultrasonic cleaning tank 12, and supports the nozzle operating portion 15 in a state where four nozzles 14 are arranged on the surface. The nozzle operating portion 15 can be rotated around a horizontal axis by a motor (not shown), and the nozzle 14 can be moved up and down as shown by an arrow 91.

A flow path, which will be described later, passes through the inside of the nozzle operating portion 15, and an electromagnetic valve or the like provided in the middle of the flow path is housed.

The ozone generation lamp 10 is an example of the gas filling member of the present invention, and two ozone generation lamps 10 are provided on the upper side of the upper wall of the operation region 5a. The ozone generation lamp 10 creates ozone gas as an example of sterilization gas from the air in the storage space 5, and fills the storage space 5 with a concentration satisfying the sterilization specified value. The casing 2 is provided with a pressure regulator 10a for adjusting the pressure in the storage space 5, so that the outside air can be taken in or discharged so that the ozone gas has a predetermined concentration or more. ing.

The circuit region 5b is provided with a control device 20, an oil tank 21, an oil pump 22, a cleaning liquid tank 23, a cleaning liquid pump 24, an air pump 25, an exhaust blower 26, and a drainage pump 27.

The control device 20 is a program sequencer and controls the operation of the above-mentioned various parts.

The oil tank 21 is a tank for storing the oil to be lubricated to the handpiece, and the oil in the tank 21 is sent by the oil pump 22 and discharged from the opening at the tip of the nozzle 14 through a flow path described later. To do.

The cleaning liquid tank 23 stores the cleaning liquid stored in the ultrasonic cleaning tank 12. The cleaning liquid pump 24 circulates the cleaning liquid in the cleaning liquid tank 23. The cleaning liquid in the cleaning liquid tank 23 is discharged from the opening at the tip of the nozzle 14 through the flow path.

In this embodiment, electrolytic functional water, which is an example of a protein dissolving solution, is used as the cleaning solution. The electrolytically functional water is electrolytically reduced water having a pH of 12 or more, is harmless, and has remarkable bactericidal activity in a short time. In addition, since it exhibits a bactericidal action while melting proteins, it is useful as a cleaning sterilizing solution for handpieces. This makes it possible to dissolve and remove blood clots and the like composed of proteins, and to sterilize and disinfect the parts covered with blood clots.

The air pump 25 takes in the sterilizing gas in the storage space 5, passes it through the flow path, and discharges it from the opening at the tip of the nozzle 14. As described above, since the storage space 5 is filled with ozone at a concentration equal to or higher than the specified concentration by the ozone generation lamp 10 during operation, the gas containing ozone flows in the flow path.

The exhaust blower 26 corresponds to an example of exhaust gas means, and is a pump for preparing exhaust gas of residual ozone gas in the storage space 5 of the casing 2 when the cleaning and sterilizing operation of the handpiece cleaning and sterilizing device is completed. is there. The exhaust blower 26 is connected to the ozone gas decomposer 28 and circulates the gas in the storage space 5 so as to pass through the ozone gas decomposer 28.

The ozone gas decomposer 28 is a gas filter in which an ozone decomposing agent is filled therein, and the ozone gas is decomposed when the ozone gas passes through the inside. As the ozone decomposing agent, for example, alumina silica gel or the like can be used.

The drainage pump 27 is a pump for discharging the cleaning liquid in the ultrasonic cleaning tank 12 to the outside of the tank. The water intake of the drainage pump 27 can be opened in the ultrasonic cleaning tank 12 to drain the cleaning liquid stored in the ultrasonic cleaning tank.

FIG. 4 is a diagram showing a configuration of a flow path of the handpiece washing and sterilizing device. The cleaning and sterilizing apparatus according to the present embodiment is provided with a flow path 30 for guiding and discharging the cleaning liquid, ozone gas, and oil to the tip of the nozzle 14.

The flow path 30 has two systems, a cleaning system path 30a through which a cleaning liquid, ozone gas and the like, and a sterilizing fluid flow, and an oil path 30b through which oil flows. This makes it possible to prevent the oil and the cleaning liquid from being mixed with each other.

As described above, the cleaning system path 30a circulates the cleaning liquid and ozone gas in the flow path and guides them to the tip of the nozzle 14. Specifically, the cleaning liquid and ozone gas sent from the cleaning liquid pump 24 and the air pump 25 are switched by the three-way solenoid valve 31, and the first solenoid valve 30 is opened to guide the fluid to the nozzle unit 9.

The oil path 30b circulates oil in the flow path and guides it to the tip of the nozzle 14. Specifically, the second solenoid valve 29 is opened to guide the oil sent from the oil pump 22 to the nozzle unit 9.

A block solenoid valve 32 is provided in the nozzle unit 9 to open only the nozzle 14 to which the handpiece 100 is mounted and prevent the fluid from being discharged from the nozzle 14 to which the handpiece 100 is not mounted. ..

Since the internal path of the handpiece 100 is configured to allow reflux, the fluid that passes through the handpiece and returns to the nozzle falls into the ultrasonic cleaning tank 12.

As described above, the cleaning liquid pump 24 conveys the cleaning liquid stored in the cleaning liquid tank 23 in the flow path 30a. Further, in the air pump 25, since the pump intake port 33 is open in the storage space 5, the ozone gas in the storage space 5 is taken in and conveyed in the flow path 30a.

Further, the oil pump 22 conveys the oil stored in the oil tank 21 into the flow path 30b.

FIG. 5 is a diagram showing an operation flow of the handpiece cleaning and sterilizing apparatus according to the present embodiment. In these operation flows, the control device 20 controls the operation of various members at appropriate timings, and the rear lid member in which the cleaning liquid is stored in the ultrasonic cleaning tank 12 and the handpiece 100 is attached to the nozzle 14. By closing 6 and operating the switches 7 on the front surface 3 of the casing 2, the following series of operations are automatically performed.

First, the nozzle unit 9 is lowered (# 1), the handpiece 100 is immersed in the ultrasonic cleaning tank 12, and ultrasonic cleaning is performed. As a result, dirt such as blood clots adhering to the outside of the handpiece can be removed.

Next, the first solenoid valve 30 is opened and the second solenoid valve 29 is closed (# 2). This prevents the fluid from the cleaning system path 30a from flowing into the oil path 30b. Further, the three-way solenoid valve 31 of the cleaning system path 30a is switched to the cleaning liquid side (# 3).

Next, the fluid pump 24 is operated to flow the cleaning liquid in the cleaning liquid tank 23 into the cleaning system path 30a (# 4). As described above, the cleaning liquid is discharged from the openings 16a and 16b at the tip of the nozzle 14 and passes through the handpiece 100 to clean the inside of the handpiece 100. The cleaning liquid that has passed through the inside of the handpiece and returned to the nozzle 14 is discharged into the ultrasonic cleaning tank 12.

The operation of the ultrasonic cleaning tank 12 is also started, and the handpiece 100 is ultrasonically cleaned in the tank. After performing ultrasonic cleaning for a predetermined time, the operation of the cleaning liquid pump and the ultrasonic cleaning tank is stopped.

Next, the nozzle unit 9 is raised (# 5), and the handpiece is taken out from the ultrasonic cleaning tank. In addition, the three-way solenoid valve 31 is switched to the ozone side (# 6).

In this state, the air pump 25 is operated to flow the ozone gas in the storage space 5 into the cleaning system path 30a (# 7). Ozone gas is discharged from the tip of the nozzle 14 to remove the cleaning liquid remaining in the handpiece and sterilize the inside of the handpiece with ozone.

After performing ozone sterilization for a predetermined time, the air pump 25 is stopped, the first solenoid valve 30 is closed, and the second solenoid valve 29 is opened (# 8). As a result, the oil path 30b is communicated with the nozzle unit 9. Next, the oil pump 22 is operated to lubricate the handpiece 100.

When the lubrication is completed, the first solenoid valve 30 is opened and the second solenoid valve 29 is closed (# 10), and the cleaning system path 30a. Is connected to the nozzle unit 9. Next, the air pump 25 is operated to circulate ozone in the handpiece 100 (# 11) to remove excess oil and sterilize bacteria and the like attached by the oil after lubrication.

All of these series of operations are completed in about 10 minutes, and a series of operations of cleaning, sterilization, and lubrication can be automatically performed in a short time.

When the above operation is completed, the drainage pump 27 is operated to drain the cleaning liquid stored in the ultrasonic cleaning tank (# 12). Next, the exhaust blower 26 is operated to pass the gas in the casing 2 through the ozone decomposer 28 to decompose the residual ozone gas (# 13). After the residual ozone gas is sufficiently decomposed, the gas in the casing is exhausted.

By the above operation, cleaning and sterilization of the inside and outside of the handpiece 100 are completed, and lubrication is also performed in a sterilized state. Therefore, the sterilized state can be maintained even after the treatment until the casing is opened.

As described above, by immersing in the cleaning liquid, stains such as proteins and blood clots attached to the surface of the handpiece can be removed, and further, by discharging the cleaning liquid and ozone from the tip of a common nozzle. , Internal cleaning and sterilization is possible. Moreover, since oil is discharged from the same nozzle, it is possible to lubricate in a sterilized state. Further, since these operations are performed in a sealed casing, the sterilized state is maintained even after the operations.

In addition, cleaning and sterilization are performed by flowing the cleaning liquid and ozone gas in this order in the flow path, and oil is lubricated after cleaning and sterilization so that oil does not flow out during cleaning. Further, since the liquid and the gas are switched and discharged, the residual liquid can be removed by flowing the ozone gas after the liquid is discharged, and sufficient cleaning work and lubrication work can be performed.

The present invention is not limited to the above embodiment, and can be implemented in various other aspects. In this embodiment, for example, ozone gas is exemplified as an example of sterilizing gas, but ethylene oxide and the like which have been conventionally used can be used. In this case, ethylene oxide can be stored in a tank or the like and sent into the casing by a pump or the like to be filled.

1 Handpiece cleaning and sterilizing device 2 Casing 3 Front 4 Opening 5 Storage space 5a
5b
6 Lid member 7 Various switches 8 Ultrasonic cleaning unit 9 Nozzle unit 10 Ozone lamp 11 Partition wall 12 Ultrasonic cleaning tank 13 Oscillation board 14 Nozzle 15 Nozzle operating parts 16a, 16b Opening 20 Control device 21 Oil tank 22 Oil pump 23 Cleaning liquid Tank 24 Cleaning liquid pump 25 Air pump 26 Exhaust blower 27 Drainage pump 28 Ozone decomposer 29 Second solenoid valve 30 First solenoid valve 31 Three-way solenoid valve

Claims (8)

A casing that can be sealed by opening and closing the lid member, an ultrasonic cleaning tank that is provided inside the casing and can store cleaning liquid, and
A gas filling member that fills the casing with sterilizing gas,
An oil tank for storing oil for maintenance of the handpiece and
A nozzle unit having a nozzle having an opening at the tip and having a flow path capable of sending a fluid into the handpiece mounted on the tip, and a nozzle unit.
A nozzle operating portion provided above the ultrasonic cleaning tank, which supports the nozzle and moves the nozzle up and down so that the handpiece attached to the nozzle can be taken in and out of the ultrasonic cleaning tank,
Wherein the cleaning liquid, wherein the sterilizing gas filled in the casing by the gas-filled member, to flow the flow paths the fluid by switching at a predetermined timing and a oil in the oil tank, ejected from the nozzle tip Equipped with a fluid control device
Wherein the nozzle actuating unit, the sterilizing gas, the timing of flowing the oil, characterized Rukoto moving the handpiece to the outside of the cleaning liquid of the ultrasonic cleaning tank, the handpiece cleaning and sterilizing apparatus. The sterilizing gas is ozone gas,
The handpiece cleaning and sterilizing apparatus according to claim 1, wherein the gas filling member is an ozone generating lamp provided in the casing. The handpiece cleaning and sterilization according to claim 2, wherein the casing includes an ozone gas decomposer for decomposing the ozone gas and an exhaust gas means for sending the ozone gas stored inside to the ozone gas decomposer. apparatus. The nozzle operating portion has a rod-like shape rotatably configured around a rotation axis extending horizontally along the peripheral edge of the ultrasonic cleaning tank.
The present invention is characterized in that the fluid control device operates so as to immerse the handpiece mounted on the nozzle in the cleaning liquid in the ultrasonic cleaning tank at the timing of flowing the cleaning liquid in the flow path. The handpiece cleaning and sterilizing apparatus according to any one of 1 to 3. The flow path is provided with supply pipes for flowing the cleaning liquid, sterilizing gas, and oil, respectively, and the supply pipe is switched by a pipe switching valve so that the cleaning liquid, ozone, and oil are discharged from the tip of the nozzle, respectively. The handpiece cleaning and sterilizing apparatus according to any one of claims 1 to 4, wherein the handpiece cleaning and sterilizing apparatus is characterized. The fluid control device is characterized in that, after flowing the cleaning liquid, the sterilizing gas, and oil in order in the flow path, the sterilizing gas is flowed again to remove residual oil. The handpiece cleaning and sterilizing apparatus according to any one of 5 to 5. The handpiece washing and sterilizing apparatus according to any one of claims 1 to 6, wherein the washing liquid is a protein dissolving liquid having a pH of 12 or higher. The handpiece cleaning and sterilizing apparatus according to any one of claims 1 to 6, wherein the cleaning liquid is electrolytically functional water having a pH of 12 or higher.

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