JPH11104149A - Hand-piece for dental sandblast - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a spray pipe of a hand-piece for a dental sandblast to spray grinding powder from being blocked with the powder. SOLUTION: This hand-piece 10 for a dental sandblast has the hand-piece main body, a powder container 30, a first compressed air supply pipe 38, a mixing room 68, a second compressed air supply pipe 72, and a shutting valve 44 to shut the first compressed air supply pipe 38. When the shutting valve 44 is closed, only compressed air will be supplied to the mixing room 68 to blow away the powder in the spray pipe, so that the spray pipe is cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handpiece for dental sandblasting in which a tooth is polished or cut by spraying an abrasive powder such as a baking soda powder or an alumina powder on the tooth.

[0002]

2. Description of the Related Art There is known a handpiece for dental sandblasting in which a tooth is polished or cut by spraying an abrasive powder such as a baking soda powder or an alumina powder on the tooth using compressed air. For example, JP-A-61-109
No. 560 has a powder container for storing grinding powder,
A handpiece for dental sandblasting is disclosed which includes a compressed air supply line for supplying compressed air to a powder container and an injection nozzle for injecting a mixture of compressed air and abrasive powder.

[0003]

In this kind of dental sandblasting handpiece, if powder remains in the injection pipe when the supply of compressed air is not being used and the supply of compressed air is not in use, the powder will be removed by moisture. May stay on the inner wall of the pipeline,
It is easy to cause clogging of pipeline. When the powder in the powder container is consumed with use and the amount of the powder in the container is reduced, the powder is shifted to the corner of the container when the handpiece is tilted. As a result, the powder is not sufficiently stirred by the compressed air, and the powder injection amount becomes insufficient. Furthermore, even during use in which compressed air is supplied, powder may accumulate in the injection conduit, and the amount of injected powder may be insufficient.

[0004] It is an object of the present invention to provide a handpiece for dental sandblasting capable of preventing clogging of a conduit for injecting a mixture of compressed air and abrasive powder. Another object of the present invention is to provide a handpiece for dental sandblasting that can stabilize the powder injection amount.

[0005]

A handpiece for dental sandblasting according to the present invention comprises: a handpiece body; a compressed air inlet provided in the body; a powder container supported by the body for storing abrasive powder; A first compressed air supply line communicating the compressed air inlet with the powder container, a mixing chamber provided in the main body,
A powder supply pipe connecting the powder container to the mixing chamber, a second compressed air supply pipe connecting the compressed air inlet to the mixing chamber, an injection nozzle communicating with the mixing chamber, and a first compressed air supply pipe And a shutoff valve for shutting off the road.

When the use of the handpiece for sandblasting is completed, the user operates the shut-off valve to shut off the first compressed air supply line before stopping the supply of compressed air from the dental unit. Thus, the supply of the compressed air to the powder container is stopped, and the supply of the powder from the powder container to the mixing chamber is stopped. However, since only the compressed air is sent to the mixing chamber through the second compressed air supply pipe, the powder adhering to the mixing chamber and the inner wall of the downstream pipe is blown off by the compressed air, and the pipe is compressed. Cleaned by air.

Further, when the powder injection amount is reduced due to the consumption of the powder, if the shut-off valve is operated intermittently two or three times,
Since compressed air is intermittently supplied from the first compressed air supply pipe to the powder container, the powder in the container is agitated, and the powder injection amount is recovered.

When the powder injection amount becomes unstable due to the accumulation of powder in the injection pipe during use of the handpiece for sandblasting, the shut-off valve may be operated intermittently two or three times. Pulsation of pressure occurs in the injection line,
Disperse the snowdrift.

In a preferred embodiment of the present invention, the shut-off valve is configured to adjust a flow rate of the compressed air passing through the first compressed air supply line.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a dental sandblasting handpiece 10 has an elongated handpiece body 12. In the embodiment shown, the body 12 comprises three parts screwed together,
It can take any other structure.

A well-known female member 16 to which a male member 14 of a standardized hose joint can be fitted is provided at the rear portion of the main body 12.
The sandblast handpiece 10 of the present invention can be connected to the dental hose 18 extending from a dental unit (not shown) with one touch. The female member 16 of the hose fitting has a shaft hole 20 for receiving the male member 14. The axially inner section of this shaft hole 20 facing the compressed air supply port 22 of the male member 14 of the hose joint acts as the compressed air inlet of the handpiece 10 and the outer section of the male member 14 facing the water supply port 24 is Acts as a water inlet.

A support portion 26 is formed below the main body 12, and a powder container 30 is attached to the support portion 26 using a nut 28. The powder container 30 can be composed of a cap 32 and a main body 34 screwed to each other. 3
0 can be filled.

The compressed air inlet 20 of the handpiece is, on the one hand, connected to the powder container 3 by a first compressed air supply line 38.
0 to supply compressed air into the powder container 30. In the illustrated embodiment, the compressed air supply line 38 includes a compressed air supply passage 40 formed in the main body 12 and an air supply tube 42 connected to the passage 40.

The compressed air supply passage 40 is provided with a shutoff valve 44 for shutting off the supply of compressed air. Referring to FIGS. 3 to 5, the shut-off valve 44 is connected to the compressed air supply passage 4.
0, a valve seat 48 engaging with the valve seat 46, and a push button type operating member 50
And a return spring 52. The fully open position of the needle valve element 48 is regulated by a fixing screw 54 screwed to the handpiece body 12 in an adjustable manner.

When the shut-off valve 44 is closed by pressing the operating member 50 as shown in FIG. 4 from the fully open state shown in FIG. 3, the supply of the compressed air to the powder container 30 is stopped. When the fixing screw 54 is tightened as shown in FIG. 5, the flow rate of the compressed air supplied to the powder container 30 can be adjusted.

The distal end of the compressed air supply pipe 42 prevents the abrasive powder 36 in the container 30 from leaking to the hose joint through the compressed air supply line 38 when the handpiece is not used. The check valve 56 is provided.

Referring to the enlarged view of FIG.
Is a main body 5 fixed to the tip of the air supply pipe 42 by press fitting or the like.
8, an axial passage 60 formed in the main body 58, an annular groove 62 formed in the outer periphery of the main body 58, an air supply hole 64 intersecting the axial passage 60 and opening in the annular groove 62, and an annular groove 62.
, And a pair of upper and lower O-rings 66 attached thereto.

The pair of O-rings 66 function as an elastic valve body for closing the air supply hole 64, and serve as a compressed air supply line 3.
When the compressed air is sent from 8, the O-ring 66
Expands radially outward to allow the compressed air to enter the powder container 30, but when the supply of the compressed air is shut off, the O-ring 66 comes into close contact with the air supply hole 64 and the abrasive powder 36 is prevented from entering the air supply hole 64.

Referring again to FIG. 2, a mixing chamber 68 for mixing powder and compressed air is formed in the handpiece body 12, and the mixing chamber 68 is connected to the powder supply passage 70 through a powder supply passage 70. Connected to container 30. When compressed air is supplied from the compressed air supply pipe 38 into the powder container 30, the abrasive powder 36 rises in the container 30 and is sent to the mixing chamber 68 via the powder supply passage 70.

The compressed air inlet 20 of the handpiece, on the other hand, has a second compressed air supply passage (bypass passage) 72.
Through the mixing chamber 68. Powder supply passage 7
The abrasive powder supplied from 0 and the compressed air supplied from the bypass passage 72 are mixed in the mixing chamber 68, and the mixture is injected from the injection nozzle 76 through the mixture pipe 74.
A check valve 73 is also provided in the bypass passage 72 to prevent the abrasive powder in the mixing chamber 68 from leaking toward the hose joint through the bypass passage 72.

In the embodiment shown, the handpiece body 1
2, a water supply pipe 78 is provided so that a mist can be formed by further adding water to the mixture of the powder and compressed air injected from the injection nozzle 76 as necessary. I have. The inlet of the water supply pipe 78 is connected to the water supply port 24 of the male member 14 of the hose joint, and the outlet thereof is connected to the outer pipe of a nozzle 76 having a double pipe structure as shown in FIG. They are in communication.

Before describing the use of the handpiece for sandblasting, the powder container 3 must be
The main body 34 of the main body 34 is loosened and removed from the cap 32, and the grindable powder 36 is introduced to a desired level.
Is screwed into the cap 32. Baking soda powder can be used for polishing teeth and dentures, and alumina powder can be used for cutting.

When the handpiece 10 is connected to the hose 18 from the dental unit and compressed air is supplied to the handpiece 10 by operating a foot switch (not shown) of the dental unit, the compressed air is supplied to the O-ring. 66 enters the powder container 30 while pushing and opening the pair. The abrasive powder in the powder container 30 is sent to the mixing chamber 68 and
2 is mixed with the compressed air from
Injected from. The dentist can supply water by operating a foot switch as needed, and can also spray a mist of powder, compressed air, and water.

With the use of the handpiece 10, the powder container 3
If the powder in 0 is consumed, the powder will lean to the corner of the container 30 when the handpiece is tilted, the powder will not be sufficiently stirred by the compressed air, and the powder supply will decrease. . In this case, if the shut-off valve 44 is closed intermittently by pushing the push-button operating member 50 two or three times, the compressed air is intermittently injected from the air supply pipe 42 into the powder container 30.
As a result, the powder in the container 30 is agitated and soars in the container, so that the powder injection amount is recovered. This method has been found to be much more effective than shaking the handpiece by hand.

Similarly, when the powder injection amount is reduced due to the accumulation of powder generated in the mixing pipe 74 and the injection nozzle 76 during use of the handpiece 10, the push button type operating member 50 is pressed two to three times. If the shut-off valve 44 is closed intermittently, a pressure pulsation is generated in the mixture pipe 74 and the injection nozzle 76, and the pool disappears due to the impact.

When the dental procedure has been completed, the dentist
By pressing the push button type operation member 50 of
The compressed air supply passage 40 is shut off for only seconds. As a result, only the compressed air from the bypass passage 72 is supplied to the mixing chamber 68, the mixing pipe 74, and the injection nozzle 76.
The abrasive powder adhering to those inner walls is blown away, and the mixing chamber 68, the mixing pipe 74, and the injection nozzle 76 are cleaned. When the cleaning is completed, the supply of the compressed air can be terminated by operating the foot switch.

[0027]

According to the present invention, each time the handpiece for sandblasting is used, the mixing chamber, the mixing pipe and the injection nozzle are cleaned by simply pushing the shut-off valve 44.
The occurrence of powder clogging can be reliably and extremely easily prevented.

Also, when the powder injection amount is reduced due to consumption of powder during use of the handpiece for sandblasting or powder accumulation generated in the pipeline, the shutoff valve is operated to operate the handpiece. Performance can be easily restored.

When the flow rate of the compressed air can be adjusted by adjusting the fixing screw 54, the supply amount of the powder can be adjusted.

[Brief description of the drawings]

FIG. 1 is a side view of a handpiece for dental sandblasting of the present invention, showing a hose joint separated from the handpiece.

FIG. 2 is a cross-sectional view of the handpiece shown in FIG. 1, showing a state where the handpiece and a hose joint are connected.

FIG. 3 is an enlarged sectional view of the shut-off valve shown in FIG. 2, showing a fully open position of the shut-off valve.

FIG. 4 is an enlarged sectional view of the shut-off valve shown in FIG. 2, showing a closed position of the shut-off valve.

FIG. 5 is an enlarged sectional view of the shut-off valve shown in FIG. 2, showing a half-open position of the shut-off valve.

FIG. 6 is an enlarged sectional view of the check valve shown in FIG. 2;

FIG. 7 is an enlarged sectional view of the nozzle shown in FIGS. 1 and 2;

[Explanation of symbols]

 10: Handpiece for dental sandblasting 12: Handpiece body 20: Compressed air inlet 30: Powder container 38: First compressed air supply line 44: Shutoff valve 68: Mixing chamber 70: Powder supply line 72: Second Compressed air supply line 76: injection nozzle

Claims (2)

[Claims] 1. A handpiece main body, a compressed air inlet provided in the main body, a powder container supported by the main body for storing abrasive powder, and a first container communicating the compressed air inlet with the powder container. A compressed air supply pipe, a mixing chamber provided in the main body, and a powder supply pipe communicating the powder container with the mixing chamber.
A dental apparatus comprising: a second compressed air supply line communicating the compressed air inlet with a mixing chamber; an injection nozzle communicating with the mixing chamber; and a shutoff valve for shutting off the first compressed air supply line. Handpiece for sandblasting. 2. The handpiece for dental sandblasting according to claim 1, wherein said shut-off valve is capable of adjusting a flow rate of compressed air passing through a first compressed air supply line.