JPH10323352A - Hand-piece for dental sand blast - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand-piece for dental sand blast which can be held upside down without scattering powder stored in the hand-piece. SOLUTION: This hand-piece 10 for dental sand blast is for grinding or cutting a tooth, etc., by blowing abrasive powder 52 stored in a powder case 26 attached at the hand-piece main body 12 over the tooth. The exit 48 of a breather pathway 44 into the powder case is opened nearly on the bottom of the powder case, while the entrance 40 of a powder sucking pathway 38 from the powder case is opened nearly on the top of the powder case.

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 or a denture is polished or cut by spraying an abrasive powder such as a baking soda powder or an alumina powder on the tooth or the denture. The present invention
In particular, it relates to a powder supply mechanism for such a handpiece.

[0002]

2. Description of the Related Art As shown in FIG. 1, a handpiece for dental sandblasting includes a main body 2 containing an air jet pump 1 and a powder container 3 for storing abrasive powder.
The abrasive powder 4 in the powder container 3 is sucked by the negative pressure generated in the air jet pump by the injection of the compressed air, and is blown together with the compressed air onto the teeth or dentures to polish or cut them. . In the powder container 3, a powder suction pipe 5 opening to the bottom of the container is extended so as to suck powder from the bottom of the container. A breather hole 7 is formed in the top wall of the lid 6 of the powder container 3 so that outside air is introduced into the container as the powder is sucked.

[0003]

In a conventional handpiece for dental sandblasting, a breather hole 7 is formed in the lid of the powder container 3. Therefore, when the powder container 3 is tilted or turned upside down, the breather hole 7 is formed. May spill out of the powder. In order to prevent powder from spilling, the handpiece must be operated while always considering the posture of the container so that the powder container does not tilt too much, so the patient's teeth can be ground or polished from various arbitrary angles. Not suitable for cutting. For this reason, the actual situation is that the conventional dental sandblast handpiece is mainly used for dental technics.

Further, since the powder suction tube 5 is opened at the bottom of the powder container, the amount of powder consumed is large, and the powder must be replenished frequently.

Further, when used in an atmosphere having a high humidity, the powder is moistened by the moisture sucked from the breather hole 7, which hinders smooth powder supply.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a handpiece for dental sandblasting, which does not spill powder even when held in any posture. Another object of the present invention is to provide a handpiece for dental sandblasting that can reduce powder consumption. Another object of the present invention is to provide a handpiece for dental sandblasting in which moisture does not enter the abrasive powder in the powder container.

[0007]

According to the present invention, there is provided a handpiece for dental sandblasting, wherein an outlet of a breather passage to a powder container is opened substantially at the bottom of the powder container, and a suction passage for powder from the powder container is opened. The inlet is opened substantially at the top of the powder container. Since the outlet of the breather passage is opened at the bottom of the powder container in this manner, when the powder container is turned upside down, the outlet of the breather passage is located at a higher level than the powder, and the powder from the breather passage is Spills are prevented. Therefore, the degree of freedom of the treatment is increased, and an appropriate dental treatment can be performed. Also, since the inlet of the powder suction passage was opened at the top of the powder container,
The powder uniformly mixed with the air sucked from the breather passage is sent to the air jet pump. Therefore, the consumption of the powder can be reduced.

[0008] In a preferred embodiment, the air inlet of the breather passage is located at the rear end of the handpiece body and connects to a hose from the dental unit. In this way, air to the breather passage can be taken in from near the dental unit via the hose, and dry air can be taken in. Therefore, the powder in the container does not get wet.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 2, a handpiece 10 for dental sandblasting has a handpiece body 12, and an air jet pump 14 is incorporated at the tip of the body 12. The air jet pump 14 has a conventional structure, and its jet nozzle 16 has a compressed air pipe 1.
8 is connected to generate a negative pressure in the venturi (negative pressure generating unit) 20 by the compressed air injected from the nozzle 16. The negative pressure generating section 20 communicates with the powder suction pipe 22.

The rear part 24 of the main body 12 has a joint (not shown).
For connection in a known manner to the hose from the dental unit.

A powder container 26 is attached to a rear portion 24 of the main body 12. For this reason, a cylindrical support member 28 with a flange is firmly attached to the rear portion 24 of the main body by press fitting or the like, and a nut 30 screwed into a screw portion of the support member 28
The lid 34 of the powder container 26 is sandwiched between the lid 32 and the flange 32. The main body 36 of the powder container 26 can be attached to the lid 34 by screwing.

The support member 28 has a powder suction passage 38 communicating with the powder suction pipe 22. Powder suction passage 38
Of the powder container 26 is opened.

A breather tube 42 is fixed to the lower end of the support member 28. The breather pipe 42 forms a part of a breather passage 44 to the powder container 26. The rest of the breather passage 44 is formed by an axial passage 46 formed in the support member 28. As can be clearly seen from FIG.
Is opened at the bottom of the powder container 26. On the other hand, the air inlet 50 of the breather passage 44 opens rearward above the lid 34.

Prior to using the handpiece, the powder container 2
6 is removed from the lid 34 by loosening the grindable powder 52.
Is inserted to the desired level, and the main body 36 is screwed into the lid 34 again. Baking soda powder can be used for polishing teeth and dentures, and alumina powder can be used for cutting.

When the air jet pump 14 is operated by supplying compressed air, the generated negative pressure is applied to the powder suction pipe 22.
Is transmitted into the powder container 26 via the powder suction passage 38. The outside air enters the powder container 26 from the breather passage 44 by the action of the negative pressure.

The outlet 48 of the breather passage 44 is connected to the powder container 2
6, the powder 52 in the container 26 is sufficiently fluidized by air entering from the breather passage 44 to be in a suspended state. The powder and air form a uniform mixture, are sucked through an inlet 40 opened at the top of the container 26, and sent to the negative pressure generator 20 via a powder suction passage 38 and a powder suction pipe 22. The grindable mixture is jetted from the jet nozzle 54 by an air jet jetted from the jet nozzle 16.

The outlet 48 of the breather passage 44 is connected to the powder container 2
6, the outlet 48 of the breather passage is located at a higher level than the powder 52 when the powder container 26 is turned upside down. Therefore, powder does not spill out of the breather passage.

FIG. 3 shows another embodiment of the handpiece for dental sandblasting of the present invention. The same components as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. Only the differences will be described. In addition to the compressed air pipe 18 and the powder suction pipe 22,
At 4 a water supply pipe 60 is provided which is connected to a hose from the dental unit, so that the dental unit supplies pressurized water to the injection nozzle 54. For this reason,
The injection nozzle 54 has a double pipe structure.

In the operation mode in which water is supplied to the injection nozzle 54, water supplied from the outer pipe of the injection nozzle 54 is added to the mixture of air and abrasive powder injected from the inner pipe of the injection nozzle 54. Is done. The generated mist prevents the powder from scattering. In some cases, the addition of water improves the grindability of the powder.

Another feature of the embodiment of FIG. 3 is that the air intake 50 of the breather passage 44 opens rearwardly into the rear portion 24 of the body so that it can be connected to a hose from a dental unit. As a result, the breather passage 44 can be connected to the dental unit via the hose, so that even in the operation mode in which mist is sprayed from the handpiece, dry air near the dental unit can be introduced into the breather passage 44. It is possible to prevent the powder in the container 26 from getting wet.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this, and various design changes can be made. For example, the shape of the powder container and the structure of the air jet pump can be appropriately changed.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a conventional handpiece for dental sandblasting.

FIG. 2 is a partially cutaway enlarged sectional view of the first embodiment of the handpiece for dental sandblasting of the present invention.

FIG. 3 is an enlarged sectional view of a second embodiment of the handpiece for dental sandblasting of the present invention.

[Explanation of symbols]

 10: Handpiece for dental sandblasting 12: Handpiece body 26: Powder container 38: Powder suction passage 40: Inlet of powder suction passage 44: Breather passage 48: Exit of breather passage 50: Air intake of breather passage

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Hashimoto 1-34-14 Higashiyukiya, Ota-ku, Tokyo Micron Co., Ltd.

Claims (2)

[Claims] 1. A dental sandblast handpiece adapted to polish or cut a tooth or the like by spraying an abrasive powder stored in a powder container attached to a handpiece body onto a tooth or the like: the powder container The outlet of the breather passage to the opening of the powder container is opened substantially at the bottom of the powder container, and the entrance of the powder suction passage from the powder container is opened almost at the top of the powder container, for dental sandblasting. Handpiece. 2. The handpiece according to claim 1, wherein an air inlet of the breather passage is arranged at a rear end of the handpiece body so as to be connectable to a hose from a dental unit.