Abrégé

Disclosed is a light-emitting module, a light source and a dental photocuring machine, relating to a technical field of oral medical instruments. On the basis of arranging a plurality of light-emitting units as a whole in a rectangular array in a preset rectangular area, light-emitting units arranged in a rectangular array in a concentric rectangular central area in the preset rectangular area contain at least two second light-emitting units, and each first light-emitting unit and second light-emitting unit in the preset rectangular area are symmetrically distributed about a center point of the preset rectangular area, therefore, light with different colors, namely, light with first color emitted by the first light-emitting unit and light with second color emitted by the second light-emitting unit are mixed into more uniform color-mixed light.

Classes IPC  ?

• A61C 13/15 - Dispositifs pour le durcissement des prothèses en matière plastique pour le durcissement par action de la lumière

Produits et services

surgical apparatus and instruments; dental apparatus and instruments; dental apparatus, electric; teeth protectors for dental purposes; medical ultrasound apparatus; armchairs for medical or dental purposes; orthodontic appliances; lamps for medical purposes; X-ray apparatus for medical purposes; medical apparatus and instruments. therapy services; health assessment services; nursing, medical; plastic surgery; health care; medical assistance; dentistry services; health counseling; convalescent home services; orthodontic services.

Abrégé

A photo-curing operation portion and a photo-curing machine are provided. The photo-curing operation portion includes: a shell, having a first end as a lamp mounting end, and a second end as a host mounting end for being mounted to a host; a photo-curing lamp, provided at the lamp mounting end, wherein the shell is provided with a mounting cavity configured to arrange wire(s) of the photo-curing lamp; and a thermally insulated structure, wherein the thermally insulated structure is provided between a thermally conductive plate of the photo-curing lamp and an inner wall of the shell.

Classes IPC  ?

• A61C 13/15 - Dispositifs pour le durcissement des prothèses en matière plastique pour le durcissement par action de la lumière
• B29C 35/08 - Chauffage ou durcissement, p. ex. réticulation ou vulcanisation utilisant l'énergie ondulatoire ou un rayonnement corpusculaire

Produits et services

Dental care services; Dental consultations; Dental gum scaling and root planing services; Dental gum scaling and root planing services for treating periodontal disease

Abrégé

The present application relates to the technical field of air-abrasion and scaling apparatuses, and particularly to a dental air-abrasion handle capable of illumination. The dental air-abrasion handle comprises a nozzle assembly, a middle assembly and a tail end assembly, which are sequentially connected, wherein a light-emitting element is provided in the nozzle assembly, the middle assembly and/or the tail end assembly, an optical propagation channel is provided on the nozzle assembly, the middle assembly and/or the tail end assembly, and a circuit connected to the light-emitting element is provided on the nozzle assembly, the middle assembly and/or the tail end assembly. Light from the light-emitting element is propagated directly or through the optical propagation channel, such that the dental air-abrasion handle has an illumination function. By means of the present utility model, during oral treatment and cleaning, a position needing to be scaled can be directly illuminated by a light source, and a better sight line is provided, thereby facilitating observation of the cleaning effect.

Classes IPC  ?

• A61C 17/02 - Dispositifs de rinçage ou insufflateurs d'air, p. ex. utilisant des jets de fluide
• A61C 3/025 - Instruments agissant à la façon d'une décapeuse au jet de sable, p. ex. pour nettoyer, polir ou couper les dents

Abrégé

An electromechanical control system of a root canal treatment device, and a cutting control method and apparatus therefor, are provided. After the drive motor used for driving a root canal file in the root canal treatment device is started up, the root canal file is controlled so as to perform a pendulum movement in a preset angle range; and after the root canal file moves across a step (102) in a root canal (101) by means of the pendulum movement, a cutting operation is performed according to a preset working mode of a user so as to eliminate the step (102). Moving across the step (102) is effectively carried out by means of the pendulum movement, and after moving across the step (102), the root canal file can be controlled according to a conventional control policy to sweep the root canal (101) .

Classes IPC  ?

• A61C 1/00 - Machines dentaires à forer ou couper
• A61C 5/40 - Instruments pour le traitement chirurgical des racines ou des nerfs dentairesAiguilles pour retirer le nerfProcédés ou instruments pour le traitement des racines

Abrégé

The present disclosure relates to the technical field of medical appliances, and provides a dental handpiece and a head thereof, and a root canal preparation machine. The head of the dental handpiece comprises a head housing; a movement cavity is provided in the head housing; a rotatable movement and a driving gear are provided in the movement cavity; the driving gear is sleeved on one end of the movement, and the movement can move along the axial direction of the driving gear; a reciprocating driving mechanism is further provided in the movement cavity, and the reciprocating driving mechanism is used for driving the movement to perform reciprocating movement along its own axis. Thus, when the dental handpiece of the present disclosure is used for root canal treatment, a root canal file is driven to perform reciprocating movement along its own axis by means of the reciprocating driving mechanism, and manual lifting is no longer required, thereby improving the treatment efficiency of root canal enlargement, reducing the requirements for the patient's cavity space, also facilitating the operation of root canal enlargement treatment, and improving the patient's experience of treatment.

Classes IPC  ?

• A61C 1/14 - Porte-outils
• A61C 5/42 - Limes pour canaux radiculairesPoignées ou moyens de guidage pour celles-ci

Abrégé

An endo motor (200) and an endo motor (200) control method. The endo motor (200) comprises a root canal handle (220), a root canal file (230), an electric motor and a first near field communication device (240), wherein the electric motor and the root canal file (230) are both connected to the root canal handle (220); the electric motor is configured to drive the root canal file (230) to rotate; the first near field communication device (240) is electrically connected to the electric motor; and the first near field communication device (240) is configured to control the electric motor on the basis of external information (250).

Classes IPC  ?

• A61C 1/00 - Machines dentaires à forer ou couper
• A61C 1/06 - Machines dentaires à forer ou couper caractérisées par l'entraînement des outils dentaires à commande électrique
• A61C 5/42 - Limes pour canaux radiculairesPoignées ou moyens de guidage pour celles-ci

Abrégé

An air intake structure (200) and a powder tank. The air intake structure comprises: a base (201), which is provided with a first passage (205), a first end of the first passage (205) being in communication with an air delivery pipe (101); and a connecting seat (202), which is provided with a second passage (206), a first end of the second passage (206) being in communication with an air guide pipe of a powder tank, wherein the base (201) is sleeved on the connecting seat (202); an annular gap (207) is formed between the base (201) and the connecting seat (202); and a second end of the first passage (205) is in communication with a second end of the second passage (206) by means of the annular gap (207). The first passage (205) and the second passage (206) of the air intake structure (200) are in communication by means of the annular gap (207), a high-pressure airflow flows through the annular gap (207) from the first passage (205) and then flows into the air guide pipe of the powder tank through the second passage (206), such that the high-pressure airflow can also flow into the second passage (206) without the need to accurately align the first passage (205) with the second passage (206), thereby simplifying the alignment process for air intake passages on the base (201) and the connecting seat (202), and improving the efficiency of assembling the base (201) and the connecting seat (202).

Classes IPC  ?

• A61C 3/025 - Instruments agissant à la façon d'une décapeuse au jet de sable, p. ex. pour nettoyer, polir ou couper les dents

Abrégé

The present invention relates to the technical field of oral medical instruments. Disclosed are a light-emitting module, a light source, and a dental light-curing machine. On the basis of the arrangement of a plurality of light-emitting units in a rectangular array within a preset rectangular area, the light-emitting units arranged in the rectangular array comprise at least two second light-emitting units (40) within a rectangular central area concentric with the preset rectangular area, and both first light-emitting units (30) and the second light-emitting units (40) within the preset rectangular area are symmetrically distributed around the center point of the preset rectangular area. Therefore, this arrangement allows a first color light emitted by the first light-emitting units (30) and a second color light emitted by the second light-emitting units (40) to blend into a more uniform mixed-color light. When the dental light-curing machine with the light-emitting module is used to radiate light-curing materials, the curing efficiency of a photoinitiator is ensured, thereby ensuring the curing effect of the light-curing materials.

Classes IPC  ?

• A61C 19/00 - Accessoires dentaires

Produits et services

surgical apparatus and instruments; medical ultrasound apparatus; armchairs for medical or dental purposes; lamps for medical purposes; X ray apparatus for medical purposes.

Produits et services

Surgical apparatus and instruments; Medical ultrasound apparatus; Armchairs for medical or dental purposes; Lamps for medical purposes; X-ray apparatus for medical purposes.

Abrégé

A circuit board module (1), a preparation method therefor, and a dental X-ray machine. Connection members (141) are respectively soldered to a first circuit board (10) and a second circuit board (12), so that an included angle is formed between the first circuit board (10) and the second circuit board (12). The two circuit boards (10, 12) remain relatively fixed due to the action of the plurality of connection members (141). Therefore, it is only required to connect one of the first circuit board (10) and the second circuit board (12) to the inner wall of a main unit case (3) of a dental X-ray machine while not to connect the other one to the main unit case (3), for ensuring the fixing of the other one in the main unit case (3), so that installation is simplified. Meanwhile, each connection member (141) can conduct electricity to realize the transmission of electric signals between the first circuit board (10) and the second circuit board (12), so that it is no longer required to solder a wire between the two circuit boards (10, 12). Thus, the assembly steps of arranging the two circuit boards (10, 12) in the main unit case (3) are reduced, and the operation is simpler, more convenient and faster.

Classes IPC  ?

• A61B 6/14 - Applications ou adaptations à l'art dentaire

Abrégé

Disclosed in the present application are a mounting structure for an X-ray tube, and a machine box and a dental X-ray machine, which relate to the technical field of X-ray apparatuses. According to the mounting structure, a fixing plate and a buffer protective sleeve are arranged opposite each other at a preset interval, and a positioning protrusion is arranged on a fixing plate, such that after a tube shell is coaxially matched inside the buffer protective sleeve, a positioning recess of an anode matches the positioning protrusion, and then the anode is connected to the fixing plate such that an axial position and a circumferential position of an X-ray tube can be limited so as to precisely position the X-ray tube; and the buffer protective sleeve protects the X-ray tube, such that a target face of the anode is opposite an exit hole in a direction perpendicular to an axial direction of the buffer protective sleeve, and X-ray generated by the target face of the anode can be emitted from the exit hole in a determined direction. Compared with the prior art, it is no longer necessary to continuously adjust the X-ray tube manually, and mounting and positioning accuracy of the X-ray tube can satisfy requirements merely by means of assembling the fixing plate, the buffer protective sleeve and the X-ray tube normally.

Classes IPC  ?

• H01J 35/00 - Tubes à rayons X
• A61B 6/00 - Appareils ou dispositifs pour le diagnostic par radiationsAppareils ou dispositifs pour le diagnostic par radiations combinés avec un équipement de thérapie par radiations

Abrégé

An electromechanical control system of a root canal treatment device, and a cutting control method and apparatus therefor, the method and apparatus are applied to the electromechanical control system of a root canal treatment device. Specifically, after the drive motor used for driving a root canal file in the root canal treatment device is started up, the root canal file is controlled so as to perform a pendulum movement in a preset angle range; and after the root canal file moves across a step (102) in a root canal (101) by means of the pendulum movement, a cutting operation is performed according to a preset working mode of a user so as to eliminate the step (102). Moving across the step (102) is effectively carried out by means of the pendulum movement, and after moving across the step (102), the root canal file can be controlled according to a conventional control policy to sweep the root canal (101) to thereby allow the root canal (101) that has the step (102) to be effectively formed.

Classes IPC  ?

• A61C 5/40 - Instruments pour le traitement chirurgical des racines ou des nerfs dentairesAiguilles pour retirer le nerfProcédés ou instruments pour le traitement des racines
• A61C 5/42 - Limes pour canaux radiculairesPoignées ou moyens de guidage pour celles-ci

Abrégé

A dental powder-jet handpiece, comprising a powder-jet handle (2) and a powder tank (8), wherein the powder-jet handle (2) is in communication with the powder tank (8); the powder tank (8) is in communication with an air supply device of a dental chair by means of a dental chair hose (1), and the air supply device supplies compressed air to the powder tank (8) by means of the dental chair hose (1); the lower end of the powder tank (8) is provided with an air input hole, and the air input end of the air input hole is in communication with the dental chair hose (1); the lower end of the powder tank (8) is provided with a first air output hole and a second air output hole; the air output end of the first air output hole is in communication with an inner cavity of the powder tank (8); the air output end of the second air output hole is in communication with the powder-jet handle (2) by means of a purging pipe (9); the air input end of the first air output hole and the air input end of the second air output hole are in communication with the air output end of the air input hole by means of a reversing valve (17); and the reversing valve (17) is used to control the air input hole to be in communication with the first air output hole or the second air output hole. When the dental jet powder in the powder-jet handle (2) is removed, it is not necessary to pour out the dental jet powder in the powder tank (8). Instead, the reversing valve (17), a second air outlet and the purging pipe (9) are additionally provided in the powder tank (8), such that an air inlet is in communication with the second air outlet by means of the reversing valve (17) but not in communication with a first outlet, and then the compressed air entering the second air outlet is guided into the powder-jet handle (2) by means of the purging pipe (9) to remove the dental jet powder remaining in the powder-jet handle (2).

Classes IPC  ?

• A61C 3/025 - Instruments agissant à la façon d'une décapeuse au jet de sable, p. ex. pour nettoyer, polir ou couper les dents

Abrégé

A root canal treatment device relates to the technical field of dental treatment instruments. The root canal treatment device includes a contra-angle hand-piece and a root canal file detachably connected to the contra-angle hand-piece, and further includes a drive module in transmission connection with the root canal file, the drive module includes a rotation driver and a vibration generator, wherein the rotation driver is configured to drive the root canal file to rotate axially, so as to mechanically cut and ream the root canal, thus shaping the root canal, and the vibration generator is configured to drive the root canal file to vibrate radially.

Classes IPC  ?

• A61C 5/42 - Limes pour canaux radiculairesPoignées ou moyens de guidage pour celles-ci
• A61C 1/06 - Machines dentaires à forer ou couper caractérisées par l'entraînement des outils dentaires à commande électrique
• A61C 1/07 - Machines dentaires à forer ou couper caractérisées par l'entraînement des outils dentaires à commande vibratoire, p. ex. ultrasonique
• A61C 1/12 - Pièces à main angulaires

Abrégé

A curved handpiece for dental root canal treatment forms an overall scheme of a dental curved handpiece, which is internally conductive, surface insulated, compact in structure, small in height and size and convenient to repair. A dental root canal length measuring function can be realized accurately, safely and stably, and a stable two-in-one function of combining root canal preparation and dental root canal length measurement is further realized. The structure is compact as a whole, and a good visual field is provided. The risk of instrument separation or preparation step generation in the operation process of doctors is reduced, and the safety improvement is greatly guaranteed. According to the scheme, it is convenient to disassemble, repair and clean, the risk of cross infection is reduced, and the use safety and convenience effects of the present invention are further improved. The curved handpiece has great market benefits.

Classes IPC  ?

• A61C 5/44 - Moyens pour contrôler la profondeur de travail, p. ex. supports ou boîtes avec jauges de profondeur, butées de positionnement ou limes munies de poignées montées de manière ajustable
• A61C 1/12 - Pièces à main angulaires
• A61C 1/16 - Couvertures protectrices pour les pièces à main ou les instruments angulaires
• A61C 1/18 - Transmissions flexiblesAccouplements ou similaires
• A61C 5/42 - Limes pour canaux radiculairesPoignées ou moyens de guidage pour celles-ci

Abrégé

The present disclosure discloses an implant packaging bottle, which includes a bottle body; a bottle cap, wherein the bottle cap has a bottle cap body detachably connected with one end of the bottle body and an implant support frame configured to extend into the bottle body; an electrified base, which is provided at the other end of the bottle body; an implant bracket detachably connected to the implant support frame, wherein the implant can be installed on the implant bracket; and an ultraviolet light source configured to be provided in the bottle body, wherein the ultraviolet light source is electrically connected to the electrified base, and a plurality of ultraviolet light sources are provided; and when the implant support frame is extended into the bottle body, a plurality of ultraviolet light sources are provided around the implant on the implant bracket.

Classes IPC  ?

• A61C 8/00 - Moyens destinés à être fixés à l'os de la mâchoire pour consolider les dents naturelles ou pour y assujettir des prothèses dentairesImplants dentairesOutils pour l'implantation

Abrégé

The present disclosure relates to the technical field of medical appliances, and provides a dental handpiece and a head thereof, and a root canal preparation machine. The head of the dental handpiece comprises a head housing; a movement cavity is provided in the head housing; a rotatable movement and a driving gear are provided in the movement cavity; the driving gear is sleeved on one end of the movement, and the movement can move along the axial direction of the driving gear; a reciprocating driving mechanism is further provided in the movement cavity, and the reciprocating driving mechanism is used for driving the movement to perform reciprocating movement along its own axis. Thus, when the dental handpiece of the present disclosure is used for root canal treatment, a root canal file is driven to perform reciprocating movement along its own axis by means of the reciprocating driving mechanism, and manual lifting is no longer required, thereby improving the treatment efficiency of root canal enlargement, reducing the requirements for the patient's cavity space, also facilitating the operation of root canal enlargement treatment, and improving the patient's experience of treatment.

Classes IPC  ?

• A61C 1/08 - Éléments de machines spécialement adaptés à la chirurgie dentaire
• A61C 5/40 - Instruments pour le traitement chirurgical des racines ou des nerfs dentairesAiguilles pour retirer le nerfProcédés ou instruments pour le traitement des racines
• A61C 5/42 - Limes pour canaux radiculairesPoignées ou moyens de guidage pour celles-ci
• A61C 1/14 - Porte-outils

Abrégé

Disclosed is an air pressure adjustment structure. The air pressure adjustment structure comprises a housing assembly, a machine core assembly, a vibration assembly, a working assembly and an air input pressure adjustment assembly, wherein the vibration assembly comprises a vibration pipe and a vibration ring; and the air input pressure adjustment assembly comprises a three-hole end cap, a locking nut, a wedge-shaped sliding block, a connection pin, an adjustment knob, an air-input short pipe and an air return pipe. During working, a high-pressure airflow enters a gap space between the vibration pipe and the vibration ring by means of an eccentric hole in the vibration pipe, and the airflow blows the vibration ring to rotate at a high speed, such that the vibration pipe generates a high-frequency vibration to drive the working assembly to vibrate at a high frequency. When the air pressure is adjusted, the connection pin and the wedge-shaped sliding block are driven to rotate by means of rotating the adjustment knob, and in the rotation process of the wedge-shaped sliding block, the cross section of an air input channel between the three-hole end cap and the machine core assembly is varied due to the blocking of the wedge-shaped sliding block, such that the actual working air pressure at the vibration pipe is influenced, thereby changing the output power of an apparatus. The adjustment manner is simple and facilitates operation.

Classes IPC  ?

• A61C 1/07 - Machines dentaires à forer ou couper caractérisées par l'entraînement des outils dentaires à commande vibratoire, p. ex. ultrasonique
• B06B 1/18 - Procédés ou appareils pour produire des vibrations mécaniques de fréquence infrasonore, sonore ou ultrasonore dans lesquels le vibrateur est déclenché par pression de fluide

Abrégé

A root canal preparation machine (200) and a root canal preparation machine (200) control method. The root canal preparation machine (200) comprises a root canal handle (220), a root canal file (230), an electric motor and a first near field communication device (240), wherein the electric motor and the root canal file (230) are both connected to the root canal handle (220); the electric motor is configured to drive the root canal file (230) to rotate; the first near field communication device (240) is electrically connected to the electric motor; and the first near field communication device (240) is configured to control the electric motor on the basis of external information (250).

Classes IPC  ?

• A61C 5/40 - Instruments pour le traitement chirurgical des racines ou des nerfs dentairesAiguilles pour retirer le nerfProcédés ou instruments pour le traitement des racines
• A61C 5/42 - Limes pour canaux radiculairesPoignées ou moyens de guidage pour celles-ci
• A61C 1/00 - Machines dentaires à forer ou couper

Produits et services

Diagnostic apparatus for medical purposes; medical apparatus and instruments; surgical apparatus and instruments; dental apparatus, electric; armchairs for medical or dental purposes; sterilized medical instruments; dental ultrasonic scalers; dental apparatus; ultrasound apparatus and parts for medical purposes; phototherapy apparatus for medical purposes.

Abrégé

A head assembly for a dental contra-angle hand-piece and a dental contra-angle hand-piece are provided. The head assembly includes a hand-piece main body, a reversing valve movably connected to the hand-piece main body, and an inner water tube connected to the hand-piece main body, wherein the hand-piece main body is provided with a first flow channel and a second flow channel independent from each other, the first flow channel is configured to be in communication with a liquid outlet of a motor, and the second flow channel is configured to be in communication with an external pipeline; the reversing valve is provided with a confluence channel, the reversing valve is configured to enable, when moving relative to the hand-piece main body, the first flow channel and the second flow channel to alternatively be in communication with the inner water pipe through the confluence channel.

Classes IPC  ?

• A61C 1/12 - Pièces à main angulaires
• A61C 1/00 - Machines dentaires à forer ou couper
• A61C 1/05 - Machines dentaires à forer ou couper caractérisées par l'entraînement des outils dentaires à commande par turbine

Abrégé

A dental contra-angle handpiece head assembly, comprising a handpiece main body (100), a reversing valve (200) and an inner water pipe (300). The handpiece main body (100) is provided with a first flow channel (110) and a second flow channel (120) which are independent from each other, the first flow channel (110) being used for communicating with a liquid outlet (2001) of a motor (002), and the second flow channel (120) is used for communicating with an external conduit (900). The reversing valve (200) is provided with a confluence channel (210), and a first connector (220) and a second connector (230) which communicate with the confluence channel (210). The reversing valve (200) is movably connected to the handpiece main body (100) so as to be switched between a first working position and a second working position; when the reversing valve is at the first working position, the first connector (220) communicates with the first flow channel (110) and the second connector (230) is blocked from the second flow channel (120); and when the reversing valve is at the second working position, the first connector (220) is blocked from the first flow channel (110) and the second connector (230) communicates with the second flow channel (120). The inner water pipe (300) communicates with the confluence channel (210) and is used for delivering a fluid to a head of the handpiece main body (100). Further provided is a dental contra-angle handpiece comprising the dental contra-angle handpiece head assembly. The working states of the dental contra-angle handpiece can be adjusted as needed, and the dental contra-angle handpiece has diversified functions.

Classes IPC  ?

• A61C 1/00 - Machines dentaires à forer ou couper

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; diagnostic apparatus for medical purposes; armchairs for medical or dental purposes; dental apparatus, electric; sterilized medical instruments; dental apparatus; dental ultrasonic scalers; ultrasound apparatus and parts for medical purposes; dental curing lights.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; diagnostic apparatus for medical purposes; armchairs for medical or dental purposes; dental apparatus, electric; sterilized medical instruments; dental apparatus; dental ultrasonic scalers; ultrasound apparatus and parts for medical purposes; dental curing lights.

Produits et services

Surgical apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; sterilized medical instruments; dental ultrasonic scalers; sandblasting machine for tooth cleaning; dental apparatus; dental curing lights.

Abrégé

A root canal treatment device, which relates to the technical field of dental treatment instruments, the root canal treatment device comprising a contra-angle handpiece (10) and a root canal file (20) detachably connected to the contra-angle handpiece (10). Further comprised is a drive module (30) which is transmissionally connected to the root canal file (20); the drive module (30) comprises a rotary driver (31) and a vibration generator (32); the rotary driver (31) is configured to drive the root canal file (20) to axially rotate so as to mechanically cut and expand the root canal, thereby shaping the root canal; the vibration generator (32) is configured to drive the root canal file (20) to radially vibrate; the root canal file (20) vibrates at a specific frequency, and can fully activate the activity of a drug material filled within the root canal, especially during the process of filling the root canal with the drug material; and the vibration provided by the vibration generator (32) is combined with the rotation of the root canal file (20) and carried out together to efficiently discharge air bubbles from the drug material filled within the root canal, such that the drug material can tightly fill the root canal, providing a better environment for subsequent root canal treatment, improving the effect of root canal treatment, and relieving the pain of a patient.

Classes IPC  ?

• A61C 5/42 - Limes pour canaux radiculairesPoignées ou moyens de guidage pour celles-ci
• A61C 5/50 - Instruments pour obturer les canaux radiculairesProcédés ou instruments pour le traitement du canal du nerf de la dent
• A61C 5/40 - Instruments pour le traitement chirurgical des racines ou des nerfs dentairesAiguilles pour retirer le nerfProcédés ou instruments pour le traitement des racines

Abrégé

A curved handpiece (100) used for dental root canal therapy, which forms an internally conductive, surface insulated, structurally compact, short in height, small in size, and convenient to maintain dental curved handpiece (100) overall solution, which can accurately, safely, and steadily implement a root canal length measurement function, and further implements a steady root canal preparation and root canal length measurement combined two in one function; also, the compact overall structure provides an excellent field of view, reducing the risk of instrument separation or a preparation ledge during the process of operation by a doctor, being a great safeguard for improved safety. The present solution is convenient to disassemble, maintain, and clean, reducing the risk of cross-infection, and further increasing use safety and convenience effects of the curved handpiece (100) used for dental root canal therapy.

Classes IPC  ?

• A61C 1/08 - Éléments de machines spécialement adaptés à la chirurgie dentaire
• A61C 5/40 - Instruments pour le traitement chirurgical des racines ou des nerfs dentairesAiguilles pour retirer le nerfProcédés ou instruments pour le traitement des racines

Abrégé

A rotatable subgingival sprayer nozzle of a dental sandblasting machine, comprising a nozzle (6), a sprayer elbow (5) and a sprayer main body (4). The nozzle (6) comprises a nozzle main body (61) and a nozzle locking cap (9), the nozzle main body (61) being rotatably connected to the nozzle locking cap (9). The nozzle (6) is detachably connected to the sprayer elbow (5), and the sprayer main body (4) is fixedly connected to the sprayer elbow (5). The nozzle main body (61) is made of a plastic material and is disposable, the nozzle (6) is provided with a second groove (8), a fourth air pipe (62) and a fourth water pipe (63), and the sprayer elbow (5) is provided with a first groove (7), a third air pipe (52) and a third water pipe (53); the third air pipe (52) passes through one end of the first groove (7) to be in an interference fit with the fourth air pipe (62), and the third water pipe (53) and the fourth water pipe (63) are connected by means of the first groove (7) and the second groove (8). Dead corners of slits between teeth and of periodontal pockets can be conveniently cleaned by rotating the direction of the nozzle (6), facilitating all-around treatment.

Classes IPC  ?

• A61C 3/025 - Instruments agissant à la façon d'une décapeuse au jet de sable, p. ex. pour nettoyer, polir ou couper les dents

Abrégé

Disclosed is a novel gutta percha point trimmer. A dentist selects a gutta percha point required to be trimmed, determines the size of a cross section required to be trimmed, rotates said gutta percha point to insert into the positioning hole of the corresponding specification, and then pushes the sliding block by hand. The sliding block slides on the base, so that the blade cuts off the excess part of the gutta percha point to trim a gutta percha point of the required size. The positioning holes of different specifications can ensure that the size of the cutting cross section of the gutta percha point is accurate. The blades are symmetrically provided in the sliding groove, on the one hand, which allows arbitrary cutting in both directions along the base; on the other hand, the blade edges of the blades are not exposed, which is safer and more reliable. The cutting of the gutta percha point is carried out on the guide rail, which can reduce the unnecessary contact area of the blades during cutting and make the blades attach to the guide rail more tightly, thereby improving the use effect of the novel gutta percha point trimmer and providing a good user experience.

Classes IPC  ?

• A61C 5/50 - Instruments pour obturer les canaux radiculairesProcédés ou instruments pour le traitement du canal du nerf de la dent
• A61C 3/00 - Outils ou instruments dentaires
• A61C 19/04 - Instruments de mesure spécialement adaptés à la technique dentaire

Abrégé

An optical path switching structure for a handle of an oral laser treatment device, comprising an optical fiber input portion, an optical fiber output portion, and a connector (1). One end of the optical fiber input portion and one end of the optical fiber output portion are connected by the connector (1), and an output end surface (2) of the optical fiber input portion and an input end surface (3) of the optical fiber output portion are disposed opposite to each other and spaced apart in the connector (1), such that the output end surface (2) of the optical fiber input portion and the input end surface (3) of the optical fiber output portion form a free-space coupling structure for transmitting a laser beam. The fee-space coupling structure allows the mechanism of laser conversion to change from a direct optical-fiber abutment to a free-space abutment, so as to avoid physical contact and the impacts caused by frequent insertion and extraction of output optical fibers, thereby preventing damage to end surfaces of the optical fibers, and improving coupling efficiency and use safety.

Classes IPC  ?

• G02B 6/26 - Moyens de couplage optique
• A61N 5/067 - Thérapie par radiations utilisant un rayonnement lumineux utilisant un rayonnement laser
• A61C 19/06 - Appareils ou dispositifs pour traitement thérapeutique

Abrégé

A dental implant packaging bottle, which is used for packaging an implant and a sealing screw matching same. The dental implant packaging bottle comprises a first bottle body, a bottle cap and a top cover, the first bottle body having a first bottle cavity and a first bottle opening in communication with the first bottle cavity, the bottle cap having a first end and a second end opposite each other, the first end being provided with a snap-fitting portion, the first end being detachably mounted at the first bottle opening, and the bottle cap and the first bottle body together defining a first closed cavity; and the second end is provided with a storage recess, the top cover is detachably mounted at an opening of the storage recess, and the top cover and the bottle cap together define a second closed cavity. The invention can place the matched implant and sealing screw, facilitates picking up and usage, and facilitates the operation of repair surgeries.

Classes IPC  ?

• B65D 51/28 - Fermetures non prévues ailleurs combinées avec dispositifs auxiliaires pour des buts autres que la fermeture avec réceptacles auxiliaires pour objets ou matériaux supplémentaires
• B65D 41/04 - Capuchons ou couvercles en forme de capuchons filetés ou similaires, fixés par rotation

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; diagnostic apparatus for medical purposes; dental apparatus and instruments; surgical cutlery; probes for medical purposes; testing apparatus for medical purposes; scissors for surgery; clips, surgical.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; diagnostic apparatus for medical purposes; dental apparatus and instruments; lamps for medical purposes; orthodontic appliances; dental apparatus, electric; apparatus for use in medical analysis; medical treatment ultrasonic instruments.

Produits et services

(1) Surgical instruments; surgical instruments for dental use; chairs for medical treatment and their parts; medical x-ray apparatus; veterinary instruments; X-ray apparatus for veterinary purposes; X-ray diagnostic apparatus; magnetic resonance imaging (MRI) diagnostic apparatus; dental abrasive discs; dental air compressors; lamps for medical purposes; orthodontic appliances; lasers for dental purposes; grinding instruments for dental use; examination tables for hospital use; dental examination chairs; dental handpieces for delivering air and water during dental examination; medical ultrasound apparatus.

Abrégé

The ultrasonic dental scaler transducer includes a horn at the front end, a piezoelectric ceramic at the middle, and a main rod at the rear end. The transducer also includes a connecting rod. A rear end of the horn is provided with a connecting groove. A front end of the connecting rod is sealingly connected to the connecting groove, and a rear end of the connecting rod extends through the main rod and extends beyond the main rod for a certain length. The piezoelectric ceramic sleeves the connecting rod, and the front and rear ends of the piezoelectric ceramic are respectively in abutting connection with the horn and the main rod. The present invention further discloses a dental scaler handle.

Classes IPC  ?

• A61C 17/20 - Dispositifs à entraînement mécanique pour nettoyer ou pour polir utilisant des ondes ultrasonores

Abrégé

The overload protection device used on a high-speed dental handpiece includes a valve body, a piston, an elastic member, and a valve plug. The valve body is provided with an air chamber and an air intake passage in communication with each other. The piston is arranged in the air chamber. The valve plug is arranged at an end of the air chamber away from the air intake passage and is connected with the valve body. The elastic member is arranged between the piston and the valve plug. An outer surface of the valve body is provided with a plurality of air discharging holes which is in communication with the air chamber. The piston is capable of opening or closing the air discharging holes when moving vertically within the air chamber. The present invention further discloses a high-speed dental handpiece with an overload protection device.

Classes IPC  ?

• A61C 1/00 - Machines dentaires à forer ou couper
• A61C 1/05 - Machines dentaires à forer ou couper caractérisées par l'entraînement des outils dentaires à commande par turbine
• F16K 17/06 - Soupapes ou clapets de sûretéSoupapes ou clapets d'équilibrage ouvrant sur excès de pression d'un côtéSoupapes ou clapets de sûretéSoupapes ou clapets d'équilibrage fermant sur insuffisance de pression d'un côté actionnés par ressort avec dispositions particulières pour régler la pression d'ouverture
• F16K 17/04 - Soupapes ou clapets de sûretéSoupapes ou clapets d'équilibrage ouvrant sur excès de pression d'un côtéSoupapes ou clapets de sûretéSoupapes ou clapets d'équilibrage fermant sur insuffisance de pression d'un côté actionnés par ressort
• F01B 25/02 - Régulation ou commande par variation de l'admission ou de l'échappement du fluide énergétique, p. ex. par variation de la pression ou du débit
• F01D 15/06 - Adaptations pour la commande des outils à main ou d'objets analogues, ou combinaisons avec ceux-ci

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; diagnostic apparatus for medical purposes; dental apparatus and instruments; gloves for medical purposes; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic instruments and their parts for medical treatment purpose.

Produits et services

Armchairs for medical or dental purposes; Curing lamps for medical purposes; Drills for dental applications; Gloves for medical purposes; Medical apparatus and instruments for use in surgery; Surgical apparatus and instruments for medical, dental or veterinary use; Surgical instruments and apparatus; Ultrasonic medical diagnostic apparatus; Ultrasonic therapy machines and apparatus

Produits et services

Armchairs for medical or dental purposes; Curing lamps for medical purposes; Drills for dental applications; Gloves for medical purposes; Medical apparatus and instruments for use in surgery; Surgical apparatus and instruments for medical, dental or veterinary use; Surgical instruments and apparatus; Ultrasonic medical diagnostic apparatus; Ultrasonic therapy machines and apparatus

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; diagnostic apparatus for medical purposes; dental apparatus and instruments; gloves for medical purposes; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic instruments and their parts for medical treatment purpose.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; dental apparatus and instruments; lasers for medical purposes; dental apparatus, electric; physiotherapy apparatus; lamps for medical purposes; orthodontic appliances.

Produits et services

surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; diagnostic apparatus for medical purposes; dental apparatus and instruments; lamps for medical purposes; orthodontic appliances; dental apparatus, electric; testing apparatus for medical purposes; Ultrasonic apparatus for medical use in diagnosis.

Produits et services

Apparatus; medical apparatus; veterinary apparatus; diagnostic apparatus for medical purposes; dental apparatus; surgical cutlery; probes for medical purposes; apparatus for use in medical analysis; scissors for surgery; clips, surgical.

Produits et services

surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; diagnostic apparatus for medical purposes; dental apparatus and instruments; lamps for medical purposes; orthodontic appliances; dental apparatus, electric; testing apparatus for medical purposes; Ultrasonic apparatus for medical use in diagnosis.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; dental apparatus and instruments; lasers for medical purposes; dental apparatus, electric; physiotherapy apparatus; lamps for medical purposes; orthodontic appliances.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; Massage apparatus; dental apparatus and instruments; orthodontic appliances; dental apparatus, electric; physiotherapy apparatus.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; Massage apparatus; dental apparatus and instruments; orthodontic appliances; dental apparatus, electric; physiotherapy apparatus.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; diagnostic apparatus for medical purposes; dental apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; Ultrasonic medical diagnostic apparatus; gloves for medical purposes.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; veterinary apparatus and instruments; diagnostic apparatus for medical purposes; dental apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; Ultrasonic medical diagnostic apparatus; gloves for medical purposes.

Produits et services

Surgical apparatus and instruments; sterilization and disinfection instruments; dental apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic scalers; dental curing lights; scaler polisher.

Abrégé

Provided is a soldering lug (1) used in an ultrasonic dental descaler. The soldering lug (1) comprises a first connection plate (110), a second connection plate (120), a third connection plate (130) and a fourth connection plate (140). Both the first connection plate (110) and the second connection plate (120) are connected to the third connection plate (130). The first connection plate (110) and the second connection plate (120) are located at the same side of the third connection plate (130). An end of the fourth connection plate (140) is connected to the third connection plate (130). The soldering lug (1) is made of cupronickel material. Provided is an ultrasonic dental descaler, comprising a piezoelectric ceramic ultrasonic transducer (2) and two soldering lugs (1). Both the two soldering lugs (1) are sheathed at a chip drive electrode on the piezoelectric ceramic ultrasonic transducer (2), and are used for extracting the chip drive electrode. Each of the soldering lugs (1) is connected to a connection wire (3), and the connection wire (3) is connected to the soldering lugs (1) by way of resistance soldering. The beneficial effects are: being easy to realize automatic soldering, being capable of making the diameter of a package structure of the piezoelectric ceramic ultrasonic transducer (2) small, and being capable of solving the problem of sparking failure that easily occurs in an injection layer.

Classes IPC  ?

• A61C 17/20 - Dispositifs à entraînement mécanique pour nettoyer ou pour polir utilisant des ondes ultrasonores
• B06B 1/06 - Procédés ou appareils pour produire des vibrations mécaniques de fréquence infrasonore, sonore ou ultrasonore utilisant l'énergie électrique fonctionnant par effet piézo-électrique ou par électrostriction

Abrégé

Provided is an anti-rotating structure used in a handle of an ultrasonic dental descaler, comprising a transducer (1), a rear snap ring (2) and a handle housing (3). The rear snap ring (2) is sheathed on a main rod (110) of the transducer (1), and the rear snap ring (2) clamps the main rod (110). The clamping fit between the rear snap ring (2) and the main rod (110) is used for preventing the occurrence of relative rotation between the rear snap ring (2) and the main rod (110). The handle housing (3) is sheathed on the rear snap ring (2), and the rear snap ring (2) clamps the handle housing (3). The clamping fit between the rear snap ring (2) and the handle housing (3) is used for preventing the occurrence of relative rotation between the rear snap ring (2) and the handle housing (3).

Classes IPC  ?

• A61C 17/20 - Dispositifs à entraînement mécanique pour nettoyer ou pour polir utilisant des ondes ultrasonores

Produits et services

(1) Surgical instruments; medical instruments for general examination; medical ultrasound apparatus; dental instruments; Armchairs for medical or dental purposes; dental drills; filling instruments for dental purposes; prosthetic instruments for dental purposes; ultrasonic medical diagnostic apparatus

Abrégé

An overload protection device used for a high-speed dental handpiece, and a corresponding dental handpiece. The overload protection device comprises a valve body (1), a piston (2), an elastic member (3), and a valve plug (4). The valve body (1) is provided with an air chamber (101) and an air inlet passage (103) communicated with each other. The piston (2) is provided in the air chamber (101). The valve plug (4) is provided on one end, distant from the air inlet passage (103), of the air chamber (101) and is connected to the valve body (1). The elastic member (3) is provided between the piston (2) and the valve plug (4). The outer surface of the valve body (1) is provided with a plurality of air outlets (102) communicated with the air chamber (101). The air outlets (102) can be opened or closed when the piston (2) moves up and down in the air chamber (101). The protection device is simple in structure, convenient to process, and low in costs, and can automatically adjust the pressure of the air delivered from a drive pipe to a rotating device of the dental handpiece so that the rotation speed of the dental handpiece is always in a normal use range, thereby implementing overload protection and guaranteeing the service life of a bearing and the dental handpiece.

Classes IPC  ?

• A61C 1/05 - Machines dentaires à forer ou couper caractérisées par l'entraînement des outils dentaires à commande par turbine
• A61C 3/02 - Instruments à forer ou couperInstruments agissant à la façon d'une décapeuse au jet de sable

Abrégé

An ultrasonic dental scaler transducer (1) and a dental scaler handle comprising the transducer (1). The transducer (1) comprises a front amplitude change rod (1.1), a middle piezoelectric ceramic (1.5), and a rear main rod (1.3), and further comprises a connecting rod (1.4). A connecting slot (1.1.1) is provided on the rear end of the amplitude change rod (1.1). The front end of the connecting rod (1.4) is sealably connected to the connecting slot (1.1.1), and the rear end of the connecting rod (1.4) penetrates through the main rod (1.3) and extends out by a certain length. The piezoelectric ceramic (1.5) is sleeved on the connecting rod (1.4). Front and rear ends of the piezoelectric ceramic (1.5) are abutted against the amplitude change rod (1.1) and the main rod (1.3), respectively. The connecting rod (1.4) extends out of the main rod (1.3) by a certain length, and is much longer than a common connecting rod so that the coaxiality of the transducer (1) during operation is well guaranteed and the comfort of the handle is significantly improved.

Classes IPC  ?

• A61C 17/20 - Dispositifs à entraînement mécanique pour nettoyer ou pour polir utilisant des ondes ultrasonores

Produits et services

Dental apparatus, namely, apex locator; Dental apparatus, namely, intra-oral light systems; Dental instruments, namely, dental root files used in root canal therapy procedures; Dental instruments, namely, root canal therapy instruments used to shave the inside of a root canal; Ultrasound appliances for dental and medical use

Abrégé

An ultrasonic dentistry scaling apparatus, comprising a main machine, a handle and a work head connected to the handle. A piezoelectric ceramic transducer is arranged in the handle. The work head is made of a TC4 titanium alloy material. A connection part (4) of the work head is connected to a mechanical output end of the piezoelectric ceramic transducer. A constant power output circuit for supplying electric energy to the piezoelectric ceramic transducer is arranged in the main machine. The constant power output circuit is connected to the handle via a tail circuit for electric energy transmission. The work head made of a TC4 titanium alloy has low hardness, small amplitude and good elasticity, which can improve the degree of comfort of a patient when being treated.

Classes IPC  ?

• A61C 17/20 - Dispositifs à entraînement mécanique pour nettoyer ou pour polir utilisant des ondes ultrasonores

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; dental apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic instrument and their parts for medical treatment purposes; light curing apparatus for dental use; diagnostic apparatus for medical purposes. Sterilization apparatus.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; dental apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic instruments, and their parts, for medical treatment purposes; dental curing lights; diagnostic apparatus for medical purposes. Sterilization apparatus.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; dental apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic instrument and their parts for medical treatment purposes; light curing apparatus for dental use; diagnostic apparatus for medical purposes.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; dental apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic instrument and their parts for medical treatment purposes; light curing apparatus for dental use; diagnostic apparatus for medical purposes.

Produits et services

(1) Surgical instruments; Medical instruments for general examination; Medical ultrasound apparatus; Sterilizers for medical use; Dental instruments; Armchairs for medical or dental purposes; Dental drills; Filling instruments for dental purposes; Prosthetic instruments for dental purposes; Ultrasonic medical diagnostic apparatus.

Produits et services

Dental and medical drill bits for cutting teeth or bone; Dental apparatus, namely, apex locator; Dental apparatus, namely, intra-oral light systems; Dental chairs; Diagnostic apparatus for the detection of periodontal disease; Gloves for medical purposes; Medical apparatus and instruments for use in surgery; Sterilization units for medical instruments; Sterilization units for medical purposes; Surgical instruments and apparatus; Ultrasonic medical diagnostic apparatus [ ; Veterinary apparatus, namely, flexible stainless steel probe for delivery of high volume liquids directly to the rumen of large animals ]

Produits et services

Dental and medical drill bits for cutting teeth or bone; Dental apparatus, namely, apex locator; Dental apparatus, namely, intra-oral light systems; Dental chairs; Diagnostic apparatus for the detection of periodontal disease; Gloves for medical purposes; Medical apparatus and instruments for use in surgery; Sterilization units for medical instruments; Sterilization units for medical purposes; Surgical instruments and apparatus; Ultrasonic medical diagnostic apparatus [; Veterinary apparatus, namely, flexible stainless steel probe for delivery of high volume liquids directly to the rumen of large animals]

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; dental apparatus; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic instruments and their parts for medical treatment purpose; diagnostic apparatus for medical purposes; ultrasonic scalers; dental curing lights.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; dental apparatus; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic instrument and their parts for medical treatment purposes; diagnostic apparatus for medical purposes; ultrasonic scalers; dental curing lights.

Produits et services

Surgical apparatus and instruments; Medical apparatus and instruments; Dental apparatus; Armchairs for medical or dental purposes; Dental apparatus, electric; Ultrasonic instrument and component for medical purposes; Radiological apparatus for medical purposes; Lasers for medical purposes; Diagnostic apparatus for medical purposes.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; dental apparatus; armchairs for medical or dental purposes; dental apparatus, electric; medical treatment ultrasonic instrument and parts; diagnostic apparatus for medical purposes.

Produits et services

Dental equipment; surgical apparatus and instruments; armchairs for medical or dental purposes; dental apparatus, electric; ultrasonic scalar; dental curing lights; scalar polisher. Sterilization and disinfection instruments.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; dental apparatus; armchairs for medical or dental purposes; dental apparatus, electric; medical treatment ultrasonic instrument and parts; diagnostic apparatus for medical purposes.

Produits et services

Surgical apparatus and instruments; Medical apparatus and instruments; Sterilization antisepsis instruments; Dental apparatus; Armchairs for medical or dental purposes; Dental apparatus, electric; Medical treatment ultrasonic instruments and parts; Radiological apparatus for medical purposes; Lasers for medical purposes; Diagnostic apparatus for medical purposes.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; sterilization antisepsis instruments; dental apparatus; armchairs for medical or dental purposes; dental apparatus, electric; medical treatment ultrasonic instrument and parts; diagnostic apparatus for medical purposes.

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments, namely, medical radiation apparatus; sterilization antisepsis instruments for medical instruments; dental apparatus, namely, drills for dental applications; armchairs for medical or dental purposes, namely, medical patient treatment chairs and dental examination chairs; electric dental apparatus, namely, drills for dental applications; medical treatment ultrasonic instrument and component parts; diagnostic apparatus for medical purposes, namely, diagnostic apparatus for the detection of periodontal disease

Produits et services

Surgical apparatus and instruments; medical apparatus and instruments; sterilization antisepsis (medical) instrument; dental apparatus; armchairs for medical or dental purposes; dental apparatus, electric; medical treatment ultrasonic instrument and parts; radiological apparatus for medical purposes; lasers for medical purposes; diagnostic apparatus for medical purposes.

Produits et services

Dental equipment; sterilization and disinfection instruments; medical instruments and apparatus; surgery apparatus and instruments; ultrasonic scaler; scaler polisher; dental curing lights; ultrasonic instruments and components for medical use; armchairs for medical or dental purposes; electric dental instruments.