JP2005102812A - Pneumatic type dental vibration handpiece equipped with easily replaceable vibrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a grip performance by improving a pneumatic type dental vibration handpiece equipped with an easily replaceable vibrator and reducing a diameter as far as possible at a part where the finger of an operator is to be hooked. <P>SOLUTION: In a storage part (42) formed at the front end of the handpiece (10), a vibrator (22) in a disposable module form is mounted so that it can be replaced. The casing (20) of the handpiece (10) is divided into a main body (24) and a front cap (26), and when the front cap (26) is detached, the most part of the vibrator (22) is exposed from the main body (24) to the front and it can be pulled out with a hand. A rotation stop member (106) whose cross section is hexagonal is formed at the rear end of the vibrator (22), and by engaging it with a notch (108) formed at the front end of the main body (24), the rotation of the vibrator is stopped to the main body (24) in attaching and detaching a vibration tool (18) to/from the handpiece. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to a pneumatic dental vibration handpiece such as a pneumatic dental scaler (calculus removal device).

Powered dental vibrating handpieces are used for dental procedures such as tartar removal and root canal reaming.
Typically, this type of dental vibration handpiece includes an elongated casing that can be gripped by a hand, a vibration source (vibrator) housed in the casing, and a vibration tool (tip for removing tartar) attached to the vibrator. And a root canal reaming file), and dental treatment such as tartar removal and root canal reaming is performed by vibrating the tool by vibration generated by a vibration source.

The vibration source of a power-type dental vibration handpiece is roughly classified into an electric vibrator that generates vibration using an electrostrictive transducer or a piezoelectric transducer, and an pneumatic vibrator that uses compressed air as a power source. Can do.
A dental handpiece provided with the former electric vibrator is disclosed in, for example, Japanese Patent Laid-Open Nos. 59-25738 and 60-55941. Since this type of electric vibrator can be operated at an ultrasonic frequency (approximately 20,000 Hz or more), there is an advantage that no noise in the audible frequency is generated. However, the difficulty of an electric vibrator is that a cardiac pacemaker or other medical electronic / electrical devices may malfunction due to electromagnetic waves radiated from an electrostrictive transducer or the like. A dental vibrating handpiece with the latter pneumatic vibrator is disclosed, for example, in US Pat. No. 4,453,919. The pneumatic vibrator includes a casing having a disk-shaped working chamber, a disk-shaped vibrator (rotor) movably accommodated in the working chamber, and an injection nozzle that jets compressed air into the working chamber in a tangential direction. And. When compressed air is injected from the injection nozzle into the working chamber, the vibrator rotates while swinging due to the action of the generated swirling flow and strikes the side wall of the working chamber to generate vibration. The vibration generated in the vibrator is transmitted to the tartar removal tip via an elongated shaft, and acts on the tooth by causing the tip of the tip to move elliptically. This pneumatic vibrator has an advantage that there is no obstacle caused by electromagnetic waves as in an electric vibrator. However, the difficulty of this pneumatic vibrator is that it can only be operated at a frequency of about 6,000 Hz or less, which causes a sharp and annoying noise called keen. In Japanese Patent Publication No. 6-28669, the pneumatic dental handpiece described in the above-mentioned U.S. Pat. It has been proposed to approach the sonic band. For this reason, the shaft is shortened so that more vibrations in the elastic vibration mode than in the flexural vibration mode are transmitted to the tartar removal tip, and the vibrator is disposed at the front end of the handpiece. If the technology of Japanese Patent Publication No. 6-28669 is used, the oscillating noise can be greatly reduced by reducing the size of the vibrator (rotor) and bringing the frequency close to the ultrasonic band (about 20,000 Hz). When the vibrator vibrator and related parts were worn out during use, the user had to send the dental handpiece to the repair center or the manufacturing factory and have the worn parts replaced by a specialist. . For this reason, the user has been forced to stop using the handpiece until the replacement of the vibrator parts is completed and the handpiece is sent back to the user. Therefore, Japanese Patent Laid-Open No. 2003-79639 discloses a pneumatic dental device equipped with a disposable vibrator that allows the user to easily replace the vibrator whenever the vibrator output decreases due to vibration of the vibrator. Vibrating handpieces have been proposed. The dental handpiece includes an elongated casing, and the casing includes a casing body and a front cap that are separably screwed together. A vibrator housing part is formed in the vicinity of the front end of the casing, and the pneumatic vibrator module is replaceably attached to this housing part. When exchanging the vibrator module, if the front cap is removed from the main body by loosening the screw, the first half of the vibrator module is exposed from the main body, so that it is removed by grasping the vibrator module with a finger and pulling it out of the main body. Simply install a new vibrator module on the main body and tighten the front cap, and the handpiece can be used again.

In general, when performing a dental procedure using a dental vibrating handpiece such as a powered dental scaler, the practitioner accurately places the tip of the dental tool against the treatment site such as the tooth surface or periodontal pocket. Must be positioned on. For that purpose, it is important that the practitioner can accurately position the tip of the tool of the handpiece with respect to the treatment site by gripping the handpiece with three points of the thumb, forefinger and middle finger. .
Therefore, whether or not the handpiece is constructed to be thick and shaped so that it can be easily gripped with the thumb, index finger, and middle finger depends on whether or not the tool is accurate with respect to the site of the tooth to be treated properly. It is extremely important in positioning.

  In the dental handpiece described in U.S. Pat.No. 4,453,919, the vibrator is arranged near the rear end of the handpiece, and the vibrator and the vibration tool are connected by an elongated shaft. There is only a shaft inside. Therefore, the handpiece can be formed into a tapered shape, and the tip portion (at the front cap) where the practitioner's thumb, forefinger and middle finger can be formed is sufficiently thin. Therefore, the practitioner can grip the handpiece with a sharp fit.

However, in the dental handpiece disclosed in Japanese Patent Publication No. 6-28669 and Japanese Patent Application Laid-Open No. 2003-79639, the vibrator module must be arranged at the front end of the handpiece as much as possible in order to bring the frequency close to the ultrasonic band. Therefore, the vibrator module must be built in the front part of the handpiece where the practitioner's thumb, forefinger and middle finger come into contact. For this reason, there is a limit to thinly forming the front portion of the handpiece where the practitioner's thumb, index finger and middle finger are applied.
As a result, when the front part of the handpiece becomes thick, it becomes difficult for the practitioner to grip the handpiece with the thumb, index finger, and middle finger, and it becomes difficult to apply force to the finger. This makes the positioning of the tool unstable, which is an obstacle to performing an accurate dental procedure.
In order to improve the ease and ease of use of the handpiece and thus facilitate the dental procedure, it is desirable to make the front cap portion of the handpiece where the practitioner's finger is located as thin as possible. Even if the outer diameter of the front cap is reduced by, for example, 1 mm, the ease of gripping is greatly improved.

  Accordingly, an object of the present invention is to improve the grip performance by improving the pneumatic dental handpiece with a replaceable vibrator and reducing the diameter of the part on which the operator's finger is applied as much as possible. is there.

The pneumatic handpiece according to the present invention includes a casing main body and a front cap that is detachably connected to the main body, and an elongated casing having a vibrator storage portion extending in the longitudinal direction formed in the vicinity of the front end; An air-operated vibrator module which is accommodated in a replaceable manner and a dental vibration tool is detachably connected to a front part; and the vibrator module is positioned in the storage part and is vibration-proof supported with respect to the casing And supporting means for supplying working fluid (compressed air and cooling water) to the vibrator module; for preventing the vibrator module from rotating with respect to the main body when a vibration tool is attached to or detached from the vibrator module; Anti-rotation means.
The feature of the present invention is that
The storage unit and the vibrator module are configured such that the main part of the vibrator module is exposed forward from the main body when the front cap is removed from the casing main body,
The detent means is configured to act between a rear portion of a vibrator module and a front portion of the main body.

As described above, since the rotation preventing means is configured to act between the rear portion of the vibrator module and the front portion of the casing body, the rotation preventing means is provided inside the front portion of the front cap held by the practitioner. It does not exist, and it is sufficient to incorporate only the vibrator module in this part of the front cap. Accordingly, the outer diameter of the portion of the front cap that is held by the practitioner can be reduced by an amount corresponding to the absence of the detent means.
As a result, the practitioner can easily grasp the handpiece with the thumb, index finger, and middle finger, and can accurately position the tool and perform an accurate dental treatment.

In a preferred embodiment, the vibrator module has a small diameter rear portion, and the detent means is at least one detent member formed at the small diameter rear portion of the vibrator module and at the front of the body to cooperate with the detent member. It consists of at least one complementary member formed.
These anti-rotation members and complementary members may be formed in the radial direction or may be arranged in the axial direction.

  In a preferred embodiment, the anti-rotation member comprises a locking portion formed on the outer periphery of the small-diameter rear portion of the vibrator module, and the complementary member comprises a recess or notch formed on the inner peripheral surface of the front portion of the main body.

  Preferably, the anti-rotation member includes a polygonal cross-section molding portion formed on the outer periphery of the rear portion of the vibrator module, and the complementary member includes a complementary cross-section molding portion formed on the inner peripheral surface of the main body front portion.

In a preferred embodiment, the region of the outer peripheral surface of the front cap that is touched by the user's finger is chamfered in a substantially hexagonal shape.
These chamfers make it possible to further reduce the effective outer diameter of the handpiece that the user holds with his / her fingers.

  The above-described features and effects of the present invention as well as other features and effects will be further clarified as the following examples are described.

1 to 6 show an embodiment of a pneumatic dental vibration handpiece according to the present invention.
Referring to FIG. 1, a dental vibrating handpiece 10 is connected to a dental hose 14 from a dental unit (not shown), for example, via a conventional four-hole hose coupling 12, thereby providing a dental The unit is configured to receive a supply of compressed air and clean water from the unit. For this reason, a male screw 16 for screwing the hose joint 12 is provided at the rear end of the handpiece 10.
Of course, the joint at the rear end of the handpiece 10 may be configured to connect a conventional ball lock type or one-touch type hose joint.

In this embodiment, the handpiece 10 is configured to be used as a dental scaler for removing tartar, and a conventional tartar removing tip (tool) 18 is detachably screwed to the front end of the handpiece 10. It comes to be worn.
When the handpiece 10 is used for root canal reaming, a root canal file can be attached to the front end of the handpiece instead of the tartar removal tool 18.

  The handpiece 10 includes an elongated casing 20 that can be gripped by a hand, and a replaceable pneumatic vibrator assembly or vibrator module 22 (see FIGS. 3 and 6) is replaceably mounted in the casing 20. .

The casing 20 that stores the vibrator module 22 in a replaceable manner includes a casing body 24 and a front cap 26 that are screwed together so as to be separable from each other.
As can be seen from FIG. 2, in the illustrated embodiment, the casing body 24 includes an outer cylinder 28 and a threaded joint 30.
An external screw 34 provided on the outer periphery of the screw joint 30 is screwed to an internal screw 32 provided on the inner periphery of the front portion of the outer tube 28, and the outer tube 28 and the screw joint 30 are bonded with an adhesive or a pin (not shown). The outer cylinder 28 and the threaded joint 30 are integrally connected by being fixed by.
On the other hand, the front cap 26 is detachably coupled to the outer cylinder 28 by screwing an inner screw 36 provided on the inner periphery of the rear cap thereof to the outer screw 34 of the screw joint 30.

  The front cap 26 is provided with a stepped hole 38 extending in the axial direction. On the other hand, the front portion of the threaded joint 30 is formed with a recess 40 that opens forward as can be seen from FIG. Therefore, when the front cap 26 is screwed into the threaded joint 30 of the casing body 24, a vibrator accommodating portion 42 extending in the longitudinal direction is formed between the front cap 26 and the casing body 24. The vibrator module 22 is detachably and exchangeably stored in the storage portion 42.

The vibrator module 22 housed in the housing portion 42 is positioned in the axial direction and the radial direction with respect to the casing 20 by a pair of front and rear O-rings 44 and 46 mounted in the outer peripheral groove of the module 22 and is supported in a vibration-proof manner. .
More specifically, the axial stepped hole 38 of the front cap 26 has a shoulder 48 (FIG. 2), and an O-ring 44 fitted in the outer peripheral groove of the module 22 is elastically applied to the shoulder 48 and the stepped hole 38. The module 22 is positioned relative to the front cap 26 and elastically supported.
Similarly, the other O-ring 46 fitted in the outer peripheral groove at the rear part of the module 22 is elastically engaged with the tapered front end of the positioning sleeve 50 (see FIGS. 2 and 6) of the screw joint 30 so that the module 22 is casing. It is positioned and elastically supported with respect to the main body 24.
The O-rings 44 and 46 also serve to hermetically seal between the module 22 and the front cap 26 as will be described later.

  The vibrator module 22 is basically based on the principle described in the above-mentioned US Pat. No. 4,453,919, and has basically the same structure as the vibrator described in Japanese Patent Publication No. 6-28669.

  As can be seen from the enlarged sectional view of FIG. 3, the vibrator module 22 includes a metal casing 52 having a cylindrical outer shape, and the vibrator casing 52 is formed with a threaded hole 54 opened rearward in the axial direction. A holed disk-shaped first end plate 56, an air injection ring 58, and a holed disk-shaped second end plate 60 are fitted in the hole 54 in this order. The retaining screws 62 screwed into the attachment holes 54 are firmly and integrally fastened together.

A disc-shaped rotor chamber 64 is defined by the inner side surfaces of the end plates 56 and 60 and the inner peripheral surface of the air injection ring 58, and a perforated disc-shaped rotor (vibrator) 66 can freely move in the rotor chamber 64. Is housed. The outer diameter and axial thickness of the rotor 66 are slightly smaller than the inner diameter and axial dimension of the rotor chamber 64, respectively, so that the rotor 66 can oscillate within the rotor chamber 64.
The end plates 56 and 60 and the rotor 66 are provided with a central hole so that a water pipe described later can be inserted without interfering with them.

The vibrator module 22 is provided to the user as a disposable module, and can be completely replaced with a new module when the output is reduced due to wear of the rotor 66 and the end plates 56 and 60.
The rotor 66 is desirably as small as possible so that the vibrator vibrates at a high frequency of 15,000 Hz or higher.

  The air injection ring 58 is formed with, for example, three injection nozzles 68 that are spaced apart in the circumferential direction. Although only conceptually shown in FIG. 3, the injection nozzle 68 opens tangentially to the rotor chamber 64 as described in US Pat. No. 4,453,919. The air blown into the air forms a swirling flow.

  In order to supply compressed air to the injection nozzle 68, an inner peripheral groove 70 is formed in the inner periphery of the casing 52 at a position facing the injection nozzle 68. The inner peripheral groove 70 is spaced apart at equal intervals in the circumferential direction. A plurality of radial inlet ports 72 (see FIGS. 3 and 6) are in communication.

The compressed air is supplied to the inlet port 72 through a compressed air supply pipe 74 extending in the outer cylinder 28, an axial passage 76 formed in the screw joint 30 in alignment with the compressed air supply pipe 74, and the axial passage 76. A communicating radial passage 78 and an annular gap 80 between the inner periphery of the front cap 26 and the outer periphery of the module 22 (the front end is sealed by the O-ring 44 and the rear end is sealed by the O-ring 81) Is done through.
The rear end of the compressed air supply pipe 74 passes through a screw joint 82 fixed to the rear end of the outer cylinder 28 and protrudes rearward, and is connected to the hose joint 12.

Used air in the rotor chamber 64 is divided into a central hole of the end plate 60, a central hole 84 (FIG. 3) of the retaining screw 62, an axial passage 86 (FIG. 2) provided in the screw joint,
It is sent back to the dental unit via the inner space 88 of the outer cylinder 28, the exhaust pipe 90 provided in the screw joint 82, and the dental hose 12.

In order to supply the tip 18 with water for cooling and cleaning the tip 18 and teeth during removal of tartar, a water supply pipe 92 is disposed in the outer cylinder 28, and its front end is connected to the screw joint 30 and the rear end. The end is supported by a threaded joint 82. The rear end of the water supply pipe 92 (shown in FIG. 1) is arranged at a different angular position from the compressed air supply pipe 74 and the exhaust pipe 90.
The water supply pipe 92 communicates with a water pipe 94 (see FIGS. 2 and 6) that is screwed into the screw hole of the axial center of the threaded joint 30.

As can be clearly seen from FIG. 3, the vibrator module 22 includes a tapered shank portion 96 for detachably mounting the tip 18, and a male screw portion 98 (FIG. 1) of the tip 18 is screwed into the shank portion 96. A female screw hole 100 (FIGS. 2 and 3) is provided. The shank portion 96 can be supported in an anti-vibration manner with respect to the front cap 26 by an O-ring 101 attached to the outer circumferential groove.
The shank portion 96 of the module 22 is provided with a water passage 102 coaxially with the female screw hole 100. When the vibrator module 22 is mounted in the housing portion 42 of the casing 20 as shown in FIG. Communicates with the water passage 102.
The water pipe 94 and the casing 52 of the module are sealed by, for example, two O-rings 104 (FIG. 3) arranged side by side.

In order to prevent the module 22 from rotating when the chip 18 is screwed or loosened in the female screw hole 100 provided in the shank portion 96 of the vibrator module 22 when the chip 18 is replaced or the module 22 is replaced. 22 must be prevented from rotating relative to the casing body 24.
According to the present invention, the rotation of the module 22 is prevented by engaging the rear portion of the retaining screw 62 of the module 22 with the positioning sleeve 50 of the casing body 24.

For this reason, a hexagonal cross-section formed portion 106 is formed by machining or the like at the rear portion of the retaining screw 62, and the corner portion of the hexagonal formed portion 106 is freely engaged with the inner periphery of the positioning sleeve 50. Six notches or recesses 108 that can be combined are formed by machining or the like. These six cutouts 108 are arranged at equal intervals in the circumferential direction corresponding to the hexagonal shaped portion 106.
Accordingly, the rotation of the module 22 is prevented by engaging the notches 108 with the corners of the hexagonal shaped portion 106.
The retaining screw 62 itself is locked to the vibrator casing 52 by bonding or pins.

As described above, the hexagon forming portion 106 for preventing the module 22 from rotating with respect to the casing body 24 uses the retaining screw 62 having a smaller diameter than the casing 52 and is formed at the rear end thereof. There is no portion protruding radially outward from the outer diameter of the casing 52. Therefore, the diameter of the front cap 26 can be reduced to the extent that the necessary minimum clearance is left between the inner peripheral surface of the front cap 26 and the outer peripheral surface of the casing 52.
Thus, according to the present invention, the outer diameter of the portion of the front cap 26 held by the finger can be reduced by about 2 mm compared to the handpiece disclosed in Japanese Patent Laid-Open No. 2003-79639. .
The diameter reduction of about 2 mm achieved by the present invention is a little bit slight, which makes it much easier for the user to grip the handpiece with his thumb, forefinger and middle finger. Enables accurate positioning. As a result, more accurate and accurate dental treatment is possible.

  Referring to FIGS. 1, 2, and 4, chamfers 110 are processed in six circumferentially equidistant areas on the outer peripheral surface of the front cap 26 in the region where the user's finger touches. These chamfers 110 enable the three fingers of the user's thumb, index finger, and middle finger to be closer to the axis of the handpiece, thereby further securing the handpiece.

Next, a mode of use of the dental handpiece 10 and a mode of replacement of the vibrator module 22 will be described.
When the handpiece 10 is used, the tip 18 is screwed into the screw hole 100 of the vibrator module 22 attached to the handpiece using a wrench, and the hose joint 12 is screwed to the male screw 16 of the screw joint 82 of the handpiece 10. Then, the compressed air and the pressure water are supplied to the handpiece by operating the foot switch of the dental unit.
When the supply of the compressed air to the vibrator 22 is started, a swirl flow is generated in the rotor chamber 64 by the compressed air tangentially injected from the injection nozzle 68 into the rotor chamber 64, which is described in US Pat. No. 4,453,919. According to the principle, the rotor 66 moves and generates vibration. The vibration generated in the vibrator 22 is transmitted to the chip 18 through the shank portion 96, and the chip 18 is vibrated at a high frequency close to the ultrasonic band.

  The user grasps the handpiece with his thumb, forefinger, and middle finger and applies the tip 18 to the treatment site to perform a dental treatment. As described above, since the handpiece having a reduced diameter can be securely gripped, the user can accurately position the tip 18.

  During calculus removal, pressure water from the dental unit is supplied to the tip of the tip through the water supply pipe 92, the water pipe 94, the water passage 102, and the central water passage of the tip 18 to cool the teeth and the tip 18. Wash away the tartar fragments.

If the rotor 66 and the end plates 56 and 60 are worn as the handpiece 10 is used, the output of the vibrator will decrease. At that time, the user can easily replace the vibrator module 22 as follows.
First, the tip 18 is loosened using a wrench and removed from the vibrator module 22 of the handpiece 10.
Next, as shown in FIG. 4, the casing body 24 is grasped with one hand, and the front cap 26 is loosened and removed from the casing body 24 while grasping the front cap 26 with the other hand.

When the front cap 26 is loosened from the casing main body 24, the vibrator module 22 is prevented from rotating with respect to the casing main body 24 by the hexagonal forming portion 106 at the rear portion of the retaining screw 62 fitting into the notch 108 of the positioning sleeve 50. Since the module 22 cannot rotate relative to the casing body 24, the friction between the water pipe 94 and the O-ring 104 becomes static friction.
On the other hand, since the front cap 26 is rotated relative to the module 22, the friction between the front cap 26 and the O-ring 44 becomes a sliding friction.

Therefore, when the front cap 26 is turned and loosened and removed from the casing body 24, the module 22 adheres to the casing body 24 as shown in FIGS. 4 and 5 due to friction between the water pipe 94 and the O-ring 104. It will be.
As can be seen from FIGS. 4 and 5, in this state, most of the vibrator module 22 is exposed forward from the casing body 24, so that it can be easily grasped with a finger.
Therefore, the user can easily pull out the vibrator module 22 from the casing body 24 as shown in FIG. 6 by grasping the casing body 24 with one hand and grasping and pulling the vibrator module 22 with the finger of the other hand. Can do. Used vibrator modules can be discarded.

The new vibrator module 22 is mounted on the casing body 24 while the hexagonal shape 106 of the retaining screw 62 of the module 22 is fitted into the notch 108 of the positioning sleeve 50, and the front cap 26 is screwed onto the casing body 24. The dental handpiece 10 can be used again only by mounting the tip 18.
Thus, whenever the output of the vibrator is reduced due to the wear of the rotor, the vibrator module can be replaced very easily and without using any special tool.

  Although the 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 cross-sectional shape of the anti-rotation molding portion 106 of the retaining screw 62 is oval, oval, triangular, quadrangular, pentagonal, or other shape, and the notch of the positioning sleeve 50 is also a complementary cross-sectional shape. be able to. Moreover, the number and shape of the components of the casing of the handpiece can be changed as appropriate.

It is the side view of the dental handpiece which concerns on the Example of this invention, and the place which removed the chip | tip and the hose coupling for tartar removal are shown. FIG. 2 is a longitudinal sectional view of the dental handpiece shown in FIG. 1. FIG. 3 is an enlarged cross-sectional view of the vibrator module illustrated in FIG. 2, in which an injection nozzle of an air injection ring is conceptually illustrated. It is a side view which shows the place which attaches or detaches the front cap of the dental handpiece shown in FIG. It is a perspective view which shows the place which attaches or detaches the front cap of the dental handpiece shown in FIG. It is a perspective view which shows the place which attaches or detaches a vibrator module to the casing main body of the dental handpiece shown to FIG. 4 and FIG.

Explanation of symbols

10: Dental vibration handpiece 18: Vibration tool 20: Casing 22: Vibrator module 24: Casing body 26: Front cap 42: Vibrator storage
44, 46: Support means
74, 76, 78, 80: Compressed air supply means
106/108: Non-rotating means

Patent Applicant Micron Corporation Attorney Hiroshi Ito

Claims (5)

An elongate casing (20) comprising a casing main body (24) and a front cap (26) detachably connected to the casing main body (24), and having a vibrator housing portion (42) extending in the longitudinal direction formed in the vicinity of the front end. )When,
A pneumatic vibrator module (22) accommodated in the housing (42) of the casing (20) in a replaceable manner, and a dental vibration tool (18) is detachably connected to the front part;
Support means (44, 46) for positioning the vibrator module (22) in the storage part (42) and supporting the vibration isolation with respect to the casing (20);
Compressed air supply means (74, 76, 78, 80) for supplying compressed air to the vibrator module;
Anti-rotation means for preventing the vibrator module (22) from rotating relative to the casing body (24) when the vibration tool (18) is attached to or detached from the vibrator module;
In the pneumatic vibrating handpiece (10) with:
The housing part (42) and the vibrator module (22) are arranged so that the main part of the vibrator module (22) is exposed forward from the casing body (24) when the front cap (26) is removed from the casing body (24). Configured,
The anti-rotation means is configured to act between a rear part of a vibrator module (22) and a front part (50) of the casing body (24), and is a pneumatic pneumatic vibrating handpiece . The vibrator module includes a small-diameter rear portion, and the anti-rotation means includes at least one anti-rotation member (106) formed at the small-diameter rear portion of the vibrator module and the front of the casing body to cooperate with the anti-rotation member. 2. A pneumatic dental vibration handpiece according to claim 1, comprising at least one complementary member (108) formed in the part. The anti-rotation member includes a locking portion (106) formed on the outer periphery of the small-diameter rear portion of the vibrator module, and the complementary member is a recess or notch (108) formed on the inner peripheral surface of the front portion of the main body. 3. A pneumatic dental handpiece according to claim 2, comprising: The anti-rotation member comprises a polygonal cross-section molding portion (106) formed on the outer periphery of the rear portion of the vibrator module, and the complementary member is formed of a complementary cross-section formed on the inner peripheral surface of the front portion of the main body. The pneumatic dental vibration handpiece according to claim 2, characterized in that it comprises a part (108). 5. The pneumatic pneumatic vibrating handpiece according to claim 1, wherein an area of the outer surface of the front cap that is touched by a user's finger is chamfered (110) in a substantially hexagonal shape.

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