WO2007034612A1 - Powder jet device for dental treatment - Google Patents

Abstract

A powder jet device for dental treatment which is provided with a powder tank (1) for holding powder, a junction (2) for feeding pressurized gas, a mixing chamber (5) for mixing pressurized gas with powder, a powder jetting nozzle (8) for jetting a mixture of powder with pressurized gas, and a powder feeding mechanism (6) for feeding powder to the mixing chamber (5). The junction (2) and the powder jetting nozzle (8) are connected through the mixing chamber (5) by hollow pipes (21, 22, 23), while the powder tank (1) and the mixing chamber (5) are connected through the powder feeding mechanism (6). The powder feeding mechanism (6) quantitatively transfers powder held in the tank (1) to the mixing chamber (5). According to the invention, powder can be stably jetted from the nozzle (8) in a constant quantity substantially independent of the quantity of powder held in the tank (1) or the pressure of the pressurized gas, and the quantity of powder jetted can be controlled.

Description

 Powder injection device for dental treatment

 Technical field

 The present invention relates to a powder injection device in the dental field. In particular, the present invention relates to a powder injection device used for treatments such as tooth grinding (or cutting), tooth caries removal, and tooth surface cleaning.

 Background art

 Conventionally, a rotary grinding apparatus using an air turbine, a micromotor, or the like as a power source has been mainly used for cutting teeth or removing carious portions of teeth in dental treatment. However, the rotary grinding machine generated heat, vibration, and noise, causing patient discomfort.

In recent years, powder injection devices have come to be used in place of rotary grinding devices. In a powder spray device, generally, compressed air mixed with powder for grinding (or cutting) is blown to a treatment site of a patient's tooth. The compressed air causes the powder to collide with the tooth surface at a sufficiently high speed, and the tooth surface is shaved. The powder injection device does not generate heat, vibration, or noise unlike the rotary grinding device, so it can reduce the pain given to the patient. Powder injection devices are used for treatments such as tooth grinding (or cutting), caries removal, and tooth surface cleaning.

 An example of such a powder injection apparatus is disclosed in Japanese Patent Application Laid-Open No. 2000-42001.

 Disclosure of the invention

 Problems to be solved by the invention

[0005] However, in the conventional powder injection device described above, the amount of powder injection depends on the amount of powder stored in the powder tank and the pressure fluctuation of the supplied pressurized gas. There was a problem that the injection amount of the powder was not stable.

[0006] When the amount of powder sprayed is less than the desired amount, the cutting ability becomes insufficient. For example, in the cutting of a tooth, there is a problem that the cutting time becomes long.

[0007] In addition, if the powder injection amount is unstable, the removal of the carious part of the tooth cannot keep the cutting ability constant, and thus it is impossible to selectively remove the softened part of the tooth. The problem of becoming was there. Further, since the cutting ability cannot be set accurately in the cleaning of the tooth surface, there is a problem in removing a healthy tooth part of the tooth.

 [0008] When performing treatments such as tooth grinding (or cutting), tooth caries removal, tooth surface cleaning, etc. with a powder injection device, the powder is selected according to the purpose of treatment and the shape and position of the treatment site. It is necessary to adjust the injection amount of the body.

[0009] According to the present invention, the amount of powder stored in the powder tank and the injection amount of powder that is hardly affected by the pressure fluctuation of the supplied pressurized gas can be stabilized and adjusted. An object of the present invention is to provide a powder injection device that can be used.

 Means for solving the problem

[0010] The dental treatment powder injection apparatus of the present invention mixes and injects powder used in dental treatment with a pressurized gas. The powder injection device for dental treatment includes a powder tank for storing the powder, a pressurized gas supply connection portion into which the pressurized gas is introduced, and a mixture for mixing the pressurized gas and the powder. A chamber, a powder injection unit that injects a mixture of the powder and the pressurized gas, and a powder supply mechanism that supplies the powder to the mixing chamber. The pressurized gas supply connection part and the powder injection part are connected by a hollow tube through the mixing chamber, and the powder tank and the mixing chamber are connected through the powder supply mechanism. Being! RU The powder supply mechanism quantitatively conveys the powder in the powder tank to the mixing chamber. The invention's effect

 [0011] According to the present invention, since the powder supply mechanism quantitatively conveys the powder in the powder tank to the mixing chamber, the amount of powder stored in the powder tank and the pressurized gas supplied Therefore, the amount of powder injection with the power of the powder injection portion that is hardly affected by the pressure fluctuation of the powder can be stabilized and adjusted.

 Brief Description of Drawings

 FIG. 1 is a schematic view of a powder injection device according to an embodiment of the present invention.

 FIG. 2 is a cross-sectional view schematically showing a powder supply mechanism in the powder injection device according to the embodiment of the present invention.

 FIG. 3 is a cross-sectional view taken along line III-III in FIG.

[FIG. 4A] FIG. 4A shows a powder feeder in a powder injection apparatus according to an embodiment of the present invention. It is the elements on larger scale which showed an example of the crevice formed in the rotating body of a structure.

 FIG. 4B is a partially enlarged development view showing another example of a recess formed in the rotating body of the powder supply mechanism in the powder injection device according to one embodiment of the present invention.

 FIG. 4C is a partially enlarged development view showing still another example of the recess formed in the rotating body of the powder supply mechanism in the powder injection device according to one embodiment of the present invention.

 FIG. 4D is a partially enlarged development view showing still another example of the concave portion formed in the rotating body of the powder supply mechanism in the powder injection device according to one embodiment of the present invention.

 FIG. 4E is a partially enlarged development view showing still another example of the concave portion formed in the rotating body of the powder supply mechanism in the powder injection device according to the embodiment of the present invention.

 FIG. 5 is a cross-sectional view showing an example of a clogging prevention mechanism in the powder injection device according to one embodiment of the present invention.

 FIG. 6 is a cross-sectional view showing another example of the clogging prevention mechanism in the powder injection device according to the embodiment of the present invention.

 BEST MODE FOR CARRYING OUT THE INVENTION

[0013] In the above powder injection device for dental treatment of the present invention, it is preferable that the powder supply mechanism includes a rotating body and a drive source for rotating the rotating body. In this case, a plurality of recesses are formed on the outer peripheral surface of the rotating body, and the powder in the powder tank is stored in the plurality of recesses of the rotating body, and the rotating body is It is preferably conveyed to the mixing chamber by rotating.

[0014] Thereby, since each concave portion accurately measures the powder, the injection amount of the powder from the powder injection unit is further stabilized. In addition, by adjusting the rotation speed of the rotating body, the amount of powder injected from the powder injection unit can be easily adjusted.

[0015] It is preferable that the pressurized gas supply connection portion and the powder tank are connected by a hollow tube so that the inside of the powder tank is pressurized!

[0016] Thus, the powder supply mechanism can prevent the powder from flowing back into the mixing chamber because the pressure in the mixing chamber is higher than that in the powder tank during powder injection, and the powder can be prevented from flowing back into the mixing chamber. The body can be supplied stably. As a result, the powder injection amount from the powder injection unit is further stabilized. [0017] It is preferable that a liquid discharge hole from which liquid is discharged is provided at the tip of the powder injection unit in addition to the powder injection hole through which the powder is injected.

[0018] Thereby, for example, after treatment by powder injection, a series of operations such as oral cleaning by liquid discharge can be efficiently performed using the same powder injection unit. In addition, since the powder injection hole and the liquid discharge hole are provided separately, it is possible to prevent clogging in the pipe that conveys the powder due to the powder coming into contact with the liquid.

[0019] It is preferable that the dental treatment powder injection device of the present invention further includes a clogging prevention mechanism for removing the powder in the plurality of concave portions of the rotating body.

[0020] With this, each concave portion can always accurately measure the powder, so that the amount of powder injected from the powder injection portion is stable over a long period of time.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view of a powder injection device according to an embodiment of the present invention. As shown in FIG. 1, the powder injection device of the present embodiment includes a powder tank 1 for storing powder, a pressurized gas supply connection portion 2 into which pressurized gas is introduced, a pressurized gas and a powder. A mixing chamber 5 for mixing the body, a powder injection unit 8 for injecting a mixture of powder and pressurized gas, and a powder supply mechanism 6 for supplying the powder to the mixing chamber 5 are provided.

 [0023] The powder tank 1 is a container for storing powder. The volume is preferably capable of storing the powder needed for at least one treatment. Specifically, it is preferable that the powder can be stored in 20 to: LOO gram, more preferably 30 to 50 gram. The lower part of the powder tank 1 has a funnel shape so that the stored powder moves to the powder supply mechanism 6 disposed underneath. A mechanism may also be provided in the powder tank 1 for applying vibration to an external force so that the powder tank 1 moves to the powder supply mechanism 6 without remaining in the powder tank 1. Also, a means for confirming the remaining amount of powder in the powder tank 1 may be provided. Examples of such means include a window through which the inside of the tank can be visually observed, or a non-contact sensor that measures the position of the upper surface of the powder in the powder tank 1.

[0024] The powder is blown onto the tooth (air blast) together with pressurized gas for treatment such as tooth grinding (or cutting), removal of carious parts of the tooth, and cleaning of the tooth surface. Known powders can be used. [0025] As the pressurized gas, there is no harm to the air or the human body, and a gas can be used. Air is preferred. More preferably, it is dry air from which moisture that causes clogging of the powder in the hollow tube is removed. In the following description, an example in which air is used as a pressurized gas will be described for easy understanding, but the present invention is not limited to this.

 The pressurized gas is introduced into the powder injection device from the pressurized gas supply connection portion 2. For example, a well-known compressor or a cylinder storing liquid gas is connected to the pressurized gas supply connection 2.

 The hollow tube 21 connected to the pressurized gas supply connection portion 2 is branched into two hollow tubes 22 and 24 by the T-shaped connection portion 4. One hollow tube 22 is connected to the mixing chamber 5, and the other hollow tube 24 is connected to the powder tank 1.

 [0028] The mixing chamber 5 has a space for uniformly diffusing the powder in the pressurized gas. The pressurized gas is supplied from the pressurized gas supply connection 2 to the mixing chamber 5 through the hollow tubes 21 and 22. The powder is supplied from the powder tank 1 to the mixing chamber 5 through the powder supply mechanism 6. The pressurized gas and the powder supplied to the mixing chamber 5 are mixed in the space in the mixing chamber 5. A mixture of the pressurized gas and the powder uniformly dispersed therein is sent to the powder injection unit 8 through the hollow tube 23. The shape of the mixing chamber 5 is not particularly limited as long as the powder can be dispersed in the pressurized gas, and may be, for example, a tank shape. Alternatively, a T provided for connecting the hollow tubes 22 and 23 and the powder supply mechanism 6 between the hollow tubes 22 and 23 connecting the pressurized gas supply connection 2 and the powder injection unit 8. It may be a letter-shaped connecting pipe.

The powder supply mechanism 6 is a means that is disposed between the powder tank 1 and the mixing chamber 5 and quantitatively sends the powder stored in the powder tank 1 to the mixing chamber 5. As shown in FIGS. 2 and 3, the powder supply mechanism 6 of the present embodiment includes a housing 18 having a cylindrical space and a rotating body for powder conveyance provided in the space so as to fill the space. 12 and a variable speed motor 7 as a drive source for rotating the rotating body 12. The rotating body 12 is supported by a pair of bearings 11 so that the rotating body 12 can rotate smoothly in the housing 18. The rotating body 12 and the motor 7 are connected via a coupling 10. The rotating body 12 has a substantially cylindrical shape, and a plurality of recesses 13 independent of each other are formed on the outer peripheral surface thereof. The powder in the powder tank 1 installed on the upper side with respect to the powder supply mechanism 6 falls into the recess 13 and is stored. Rotating body 12 When rotating in the negative direction, the powder stored in the recess 13 rotates with the rotating body 12 and is conveyed to the mixing chamber 5. A pair of ring seals 9 are provided between the pair of bearings 11 and the region where the plurality of recesses 13 are formed so that the powder from the powder tank 1 is not mixed into the pair of bearings 11 during conveyance. Is provided. In FIG. 2, arrow 41 indicates the moving direction of the powder, and arrow 42 indicates the moving direction of the pressurized gas. In FIG. 3, an arrow 12a indicates the rotation direction of the rotating body 12.

 [0030] The powder injection unit 8 is a handpiece held by an operator's hand when the operator treats a patient. The powder injection unit 8 is connected to the mixing chamber 5 and the hollow tube 23. A powder injection hole (not shown) for injecting a mixture of pressurized gas and powder obtained in the mixing chamber 5 is formed at the tip of the powder injection unit 8. The shape of the powder injection unit 8 is not particularly limited, but may be a pencil shape, for example. In order to ensure good workability at the time of treatment, it is preferable that the hollow tube 23 connecting the apparatus main body and the powder injection unit 8 and the hollow tube 25 described later have a soft material force. The apparatus main body and the hollow tube 23, and the hollow tube 23 and the powder injection unit 8 are preferably all connected by a detachable connector. Thereby, after using the powder injection device, the main body force hollow tube 23 and the powder injection portion 8 can be separated and cleaned individually.

 [0031] Powder injection from the powder injection unit 8 is performed as follows. The pressurized gas introduced from the pressurized gas supply connection 2 is sent to the mixing chamber 5. The motor 7 is rotated at a predetermined constant rotation speed, and the rotating body 12 is rotated through the coupling 10. The powder in the powder tank 1 is stored in a recess 13 formed on the outer periphery of the rotating body 12. The powder stored in the recess 13 is sent to the mixing chamber 13 as the rotating body 12 rotates. The pressurized gas and the powder respectively sent to the mixing chamber 5 are mixed in the mixing chamber 5. The powder mixed in the pressurized gas is sent to the powder injection unit 8 by the pressure of the pressurized gas, and is injected from the powder injection hole at the tip thereof.

[0032] According to the present invention, the rotating body 12 rotates at a constant rotational speed, and each recess 13 formed in the rotating body 12 accurately measures the powder. Thus, the powder supply mechanism 6 quantitatively conveys the powder in the powder tank 1 to the mixing chamber 5. Therefore, it is almost unaffected by the amount of powder stored in the powder tank 1 and the pressure of the pressurized gas supplied to the mixing chamber 5 and the air volume. A substantially constant amount of powder can be injected from the powder injection unit 8. Further, by adjusting the rotational speed of the variable speed motor 7 that drives the rotating body 12, the amount of powder injected from the powder injection unit 8 can be easily adjusted according to the purpose of use.

 [0033] Further, the pressurized gas is sent to the powder tank 1 through the T-shaped connecting portion 4 and the hollow tube 24, so that the inside of the powder tank 1 is pressurized. Therefore, it is possible to prevent the powder tank 1 from flowing into the powder tank 1 from the mixing chamber 5 due to a lower pressure in the powder tank 1 than in the mixing chamber 5 when the powder is to be injected. Since the pressurized gas sent to the powder tank 1 pushes down the powder in the powder tank 1 toward the powder supply mechanism 6, the powder is sufficiently filled in the recess 13 of the rotating body 12. Accordingly, since the powder accurately measured by each recess 13 is stably conveyed to the mixing chamber 5, the amount of powder injected from the powder injection unit 8 is further stabilized.

 [0034] An injection pressure adjusting mechanism for adjusting the flow rate (or pressure) of the pressurized gas may be provided! /. For example, as shown in FIG. 1, an injection pressure adjusting mechanism 19 can be provided in the hollow tube 21. As the injection pressure adjusting mechanism 19, for example, a normal pressure adjusting valve can be used. By adjusting the flow rate (or pressure) of the pressurized gas using the injection pressure adjusting mechanism 19, the injection pressure of the gas injected from the powder injection unit 8 (ie, the velocity of the powder) can be adjusted. it can. However, since the amount of powder mixed in the pressurized gas is determined by the powder supply mechanism 6, the amount of powder does not change even if the injection pressure from the powder injection unit 8 is changed. Therefore, by providing the injection pressure adjusting mechanism 19 in addition to the powder supply mechanism 6, the surgeon can independently control the gas injection pressure and the powder injection amount from the powder injection unit 8 according to the treatment purpose. Can be adjusted.

 [0035] The powder injection unit 8 preferably has a liquid discharge hole (not shown) through which liquid is discharged at the tip thereof. The liquid is introduced from the liquid supply connection unit 3 and sent to the powder injection unit 8 through the hollow tube 25. For example, water can be used as the liquid. The hollow tube 25 may be provided with a liquid adjusting mechanism 26 for adjusting the flow rate (or pressure) of the liquid. As the liquid adjusting mechanism 26, for example, a normal pressure adjusting valve can be used.

[0036] The supply of powder to the powder injection unit 8 is adjusted independently by the powder supply mechanism 6, the supply of pressurized gas is adjusted by the injection pressure adjustment mechanism 19, and the supply of liquid is adjusted independently by the liquid adjustment mechanism 26. can do. Therefore, for example, after treatment with powder injection, the powder supply is stopped. Then, the liquid can be discharged while injecting the pressurized gas to perform oral cleaning.

 [0037] The piping for conveying the powder and the pressurized gas and the piping for conveying the liquid are independent, the powder and the pressurized gas from the powder injection hole, the liquid from the liquid discharge hole, It is preferable that the powder, the pressurized gas, and the liquid are mixed after each injection. As a result, the powder does not touch the liquid until it is ejected from the powder ejection hole, so that when the hygroscopic powder is used, the powder is prevented from being clogged in the hollow tube. be able to

[0038] In order to allow the powder and liquid to collide with various treatment sites of the patient accurately, the tip part of the powder injection part 8 in which the powder injection hole and the liquid discharge hole are formed has various parts with different shapes. Preferred to be interchangeable ,.

FIG. 4A to FIG. 4E are views showing a part of the recess 13 formed on the outer peripheral surface of the rotating body 12 of the powder supply mechanism 6 developed on a flat surface. In each figure, an arrow 12b indicates the moving direction of the outer peripheral surface when the rotating body 12 rotates. The shape and arrangement of the recess 13 are not particularly limited as long as the powder can be stored therein. The shape of the recess 13 in plan view may be, for example, the circular shape shown in FIGS. 4A to 4C, the long hole shape (groove shape) shown in FIGS. 4D and 4E, or other than these. It may be a shape. As for the arrangement of the recesses 13, there is only one row of recesses 13 (hereinafter referred to as “recess row”) along the moving direction 12b of the outer peripheral surface of the rotating body 12 (see FIGS. 4A, 4D, and 4E). It may be a plurality (see FIGS. 4B and 4C). It is preferable to consider the shape and arrangement of the recess 13 so that the amount of the powder conveyed to the mixing chamber 5 does not vary with time. That is, when the circular recesses 13 are arranged in one row as shown in FIG. 4A, the positions in the movement direction 12b of the recesses 13 are coincident between the plurality of recess rows as shown in FIG. 4B, and FIG. As described above, when the major axis direction of the recess 13 is parallel to the rotation center axis direction of the rotating body 12, the amount of powder conveyed to the mixing chamber 5 changes in a pulse manner. On the other hand, when the position of the recess 13 in the movement direction 12b is shifted between the plurality of recess rows as shown in FIG. 4C, and the long axis direction of the recess 13 is the rotation center axis of the rotating body 12 as shown in FIG. 4E. When it is inclined with respect to the direction, the amount of powder conveyed to the mixing chamber 5 becomes almost constant over time. Therefore, in order to inject the powder from the powder injection unit 8 at a constant injection amount without interruption, the recess 13 is formed as shown in FIG. And arranged like Figure 4E !, preferably! /

[0040] If all of the powder stored in the recess 13 remains in the recess 13 without being delivered to the mixing chamber 5, the powder cannot be accurately measured by the recess 13. Therefore, it is preferable that the powder supply mechanism 6 is provided with a clogging prevention mechanism for removing the powder remaining in the recesses 13.

 FIG. 5 is a cross-sectional view showing an example of a clogging prevention mechanism. In this clogging prevention mechanism, a rod 31 having a brush 32 attached to the tip thereof is inserted into a through hole 18a provided in the nose / housing 18 of the powder supply mechanism 6. When cleaning the recess 13 of the rotating body 12, the rod 31 is pushed in to bring the brush 32 into contact with the rotating body 12. When the brush 32 comes into contact with the inner surface of the recess 13, the powder adhering to the inner surface can be removed. A recess 18b is formed in the vicinity of the opening of the through hole 18a on the inner wall surface of the nosing 18 so that the brush 32 can be freely held by the rotating body 12 rotating in the direction of rotation 12a. . The removed powder falls downward through a groove-like recess 18c formed on the inner wall surface of the housing 18. The rod 31 is supported by a ring seal 33 so that powder and pressurized gas do not leak outside through the through hole 18a.

 FIG. 6 is a cross-sectional view showing another example of the clogging prevention mechanism. In this clogging prevention mechanism, a compressed air source (not shown) is connected to a through hole 18 a provided in the housing 18 via a valve 35. When cleaning the recess 13 of the rotating body 12, the compressed air 36 is jetted into the housing 18 in a pulsed manner by opening and closing the valve 35. Since the compressed air 36 is intermittently blown onto the inner surface of the recess 13, the powder adhering to the inner surface can be removed. The removed powder falls downward through a groove-like recess 18 c formed on the inner wall surface of the housing 18.

 5 and 6 are examples, and the configuration of the clogging prevention mechanism is not limited to these.

In the above-described embodiment, the pressurized gas is supplied from a pressurized gas supply source such as a compressor installed outside the powder injection apparatus or a cylinder storing liquefied gas via the pressurized gas supply connection unit 2. Installed in the device. However, the present invention is not limited to this, and a pressurized gas supply source may be provided in the powder injection apparatus. The following problems may occur when using pressurized gas from a pressurized gas supply source installed outside the powder injection device. The For example, the powder injection pressure from the powder injection unit 8 is limited by the capability of the pressurized gas supply source. In addition, when another device is connected to the pressurized gas supply source in addition to the powder injection device of the present invention, the powder from the powder injection unit 8 depends on the amount of pressurized gas used by the other device. Body injection pressure fluctuates. When the powder injection device of the present invention includes a pressurized gas supply source, these problems do not occur, and the degree of freedom in setting the powder injection pressure from the powder injection unit 8 is improved. Moreover, fluctuations in the injection pressure can be prevented. In this case, the pressurized gas supply connecting portion 2 means a connector for connecting the pressurized gas supply source in the powder injection apparatus and the hollow tube 21.

 [0045] In the above embodiment, the liquid is introduced into the apparatus via the liquid supply connection 3 as well as the liquid supply source such as a water supply, a liquid tank and a pump installed outside the powder injection apparatus. . However, the present invention is not limited to this, and the liquid supply source may be provided in the powder injection apparatus. The following problems may occur when using liquid from a liquid supply source installed outside the powder injection device. For example, when another device is connected to the liquid supply source in addition to the powder injection device of the present invention, the amount of liquid discharged from the powder injection unit 8 varies depending on the amount of liquid used by the other device. To do. In addition, it is difficult to use liquids containing special components that are not used in other devices. These problems do not occur when the powder injection device of the present invention includes a liquid supply source. That is, a stable discharge amount of liquid can be obtained. It is also possible to use liquids that have been specially adjusted for powder injection devices. Thus, for example, using a liquid having at least one of a disinfecting action, a sterilizing action, and an analgesic action as a liquid, the tooth is ground (or cut) by powder injection, the carious site of the tooth is removed, When performing treatments such as cleaning Z and tooth surfaces, it is possible to simultaneously perform at least one of disinfection, sterilization, and analgesia.

[0046] When grinding a tooth (or cutting or removing a carious part of a tooth using a powder injection device), it is not possible to continue to inject powder intensively to a specific part of the target tooth. It is preferable to repeat the operation of spraying the powder evenly over the entire region and scraping the treatment region into a layer with a constant thickness multiple times, when the powder injection unit 8 simultaneously performs the powder injection and the liquid discharge. , The problem is that the liquid is atomized and the field of view is obstructed and the treatment site becomes visible May occur. In addition, with a rotary grinding machine that uses an air turbine or a micromotor as a power source, the operator can feel the grinding amount sensuously through grinding and other information such as vibration from the handpiece. However, in the powder injection device, the operator cannot obtain information such as vibration from the powder injection unit 8 held in the hand at the time of grinding, and the amount of grinding cannot be felt sensibly. Therefore, it may be difficult to cut the entire treatment site into a layer having a certain thickness.

[0047] Therefore, it is preferable to provide a liquid supply source in the powder injection device, supply the liquid from the liquid supply source to the powder injection unit 8 in a pulse shape, and obtain a period in which no mist is generated by the liquid. As a result, it is possible to secure the operator's field of view at the time of treatment, thereby improving the work efficiency of the treatment. Furthermore, when the operator grinds the treatment site, the operator visually recognizes the fog generated at a constant cycle, and moves the powder injection unit 8 in synchronization with the generation cycle of the fog. In addition, the entire treatment site can be scraped into a layer with a certain thickness. Even when a liquid supply source installed outside the powder injection device is used, for example, by operating the liquid adjustment mechanism 26 so that the liquid supply to the powder injection unit 8 is pulsed, The same effect as above can be obtained.

 [0048] The embodiments described above are intended to clarify the technical contents of the present invention, and the present invention should be construed as being limited to such specific examples. However, various modifications may be made within the spirit and scope of the invention described in the claims, and the present invention should be interpreted broadly.

 Industrial applicability

[0049] The field of use of the present invention is not particularly limited, but is used as a powder injection device used for treatments such as tooth grinding (or cutting), tooth caries removal, and tooth surface cleaning. be able to.

Claims

The scope of the claims  [1] A powder treatment apparatus for dental treatment in which powder used in dental treatment is mixed with a pressurized gas and sprayed.  A powder tank for storing the powder; a pressurized gas supply connection for introducing the pressurized gas; a mixing chamber for mixing the pressurized gas and the powder; and the powder and the pressurized gas. A powder injection unit for injecting the mixture of the powder, and a powder supply mechanism for supplying the powder to the mixing chamber,  The pressurized gas supply connection part and the powder injection part are connected via a hollow tube via the mixing chamber, and the powder tank and the mixing chamber are connected via the powder supply mechanism. Has been  The powder injection mechanism for dental treatment, wherein the powder supply mechanism quantitatively conveys the powder in the powder tank to the mixing chamber.  [2] The powder supply mechanism includes a rotating body and a drive source for rotating the rotating body, and a plurality of recesses are formed on an outer peripheral surface of the rotating body, and the powder in the powder tank 2. The powder injection device for dental treatment according to claim 1, wherein the powder is stored in the plurality of recesses of the rotating body and is conveyed to the mixing chamber by rotating the rotating body.  [3] The powder injection apparatus for dental treatment according to claim 1, wherein the pressurized gas supply connection part and the powder tank are connected by a hollow tube, and the inside of the powder tank is pressurized. .  4. The dental treatment powder according to claim 1, wherein a liquid discharge hole for discharging a liquid is provided at a tip of the powder injection unit in addition to a powder injection hole for discharging the powder. Body injection device.  [5] The powder injection device for dental treatment according to [1], further comprising a clogging prevention mechanism for removing the powder in the plurality of recesses of the rotating body.